Micro-magnetic evaluation of micro residual stresses of the IInd and IIIrd order (2009)
Altpeter, I., Dobmann, G., Kröning, M., Rabung, M., Szielasko, K.
Micro residual stresses (MRS) of the IInd and IIIrd order play an important role in the fracture mechanical analysis of thermally cycled materials, and thus in lifetime analysis of such affected...
Altpeter, I., Sklarczyk, C., Kopp, M., Kröning, M., Hübner, S.
Trends in the automotive industry tend towards fuel saving and reduction of exhaust gases by weight reduction. On the other hand the enhancement of safety is required. From this it follows an...
Kröning, M., Dobmann, G., Wolter, B.
Production/Process Integrated Non Destructive Testing (NDT) Systems are increasingly becoming a part of automated production environments. This is being driven by a combination of low cost and higher...
Progress in NDT system engineering through sensor physics and integrated efficient computing (2008)
Kröning, M., Ribero, J.G., Vidal, A.
Nondestructive testing (NDT) system engineering is comprised of different technologies, primarily measurement physics, computing, electronics, mechanical engineering and automation. Significant...
Ultrasonic and eddy current inspection of rail wheels and wheel set axles (2008)
Rockstroh, B., Kappes, W., Walte, F., Kröning, M., Bessert, S., Schäfer, W., ...
As a means of transport, the railway is gaining in importance, and this has inspired a large number of innovations. International rail traffic, for example, and logistics solutions need to be...
Real-time measurement of relative sensor position changes by ultrasonic signal evaluation (2008)
Yastrebova, O., Bulavinov, A., Kröning, M.
Ultrasonic testing is considered to be one of the most commonly applied nondestructive testing techniques for flaw detection and material characterization. Traditional Nondestructive Testing (NDT)...
Ultrasonic examination of austenitic stainless steel welds using EMATS (2008)
Sharma, G.K., Rajkumar, K.V., Jayakumar, T., Rao, B.P., Raj, B., Niese, F., ...
This paper describes EMAT phased array equipment and SH-wave probes and presents the results of inspection of the welds in the calibration blocks and in a mock-up sector of a large diameter stainless...
Real-time processing of NDT data for in-line control of production processes (2008)
Kröning, M., Pinchuk, R., Reddy, K.M.
In-line monitoring and control of production process will be efficient only when the monitoring and feed back control is also performed on-line or in real-time. Given these conditions of real time...
Real-time measurement of relative sensor position changes by ultrasonic signal evaluation (2008)
Yastrebova, O., Bulavinov, A., Kröning, M.
Ultrasonic testing is considered to be one of the most commonly applied nondestructive testing techniques for flaw detection and material characterization. Traditional Nondestructive Testing (NDT)...
Application of sampling phased array technique for ultrasonic inspection of CFRP components (2008)
Bulavinov, A., Hegemann, J., Oster, R., Hanke, R., Kröning, M., Pudovikov, S., ...
The article presents latest resultson ultrasonic inspection of carbon-fiber strucutres by the Samplin Phased Array Method. A comparative Study of inspection results obained by common single element...
Kröning, M., Bulavinov, A., Reddy, K.M., Walte, F., Dalichow, M.
The ability to perform nondestructive testing of stainless steel piping and dissimilar metal joints in excess of 10.0mm (.4") wall thickness is very limited. In particular the use of ultrasound to...
Current NDT research & development for NPP inspections (2008)
Bieder, P., Dobmann, G., Kröning, M., Liu, J., Ribero, J.G.
The current dynamic process in computing, microelectronics, smart sensors and automation provide NDT system engineers with challenging opportunities for improved NDT solutions. We focus on the...
Kröning, M., Bulavinov, A., Reddy, K.M., Walte, F., Dalichow, M.
The ability to perform nondestructive testing of stainless steel piping and dissimilar metal joints in excess of 10.0mm (.4") wall thickness is very limited. In particular the use of ultrasound to...
Current NDT research & development for NPP inspections (2008)
Bieder, P., Dobmann, G., Kröning, M., Liu, J., Ribero, J.G.
The current dynamic process in computing, microelectronics, smart sensors and automation provide NDT system engineers with challenging opportunities for improved NDT solutions. We focus on the...
Ultrasonic and Eddy-current inspection of rail wheels and wheel set axles (2008)
Rockstroh, B., Kappes, W., Walte, F., Kröning, M., Bessert, S., Schäfer, W., ...
As a means of transport, the railway is gaining in importance, and this has inspired a large number of innovations. International rail traffic, for example, and logistics solutions need to be...
Progress in NDT system engineering through sensor physics and integrated efficient computing (2008)
Kröning, M., Ribero, J.G., Vidal, A.
Nondestructive testing (NDT) system engineering is comprised of different technologies, primarily measurement physics, computing, electronics, mechanical engineering and automation. Significant...
Neue Frontend-Elektronik für die Ultraschall- und Wirbelstromprüfung von Rädern und Wellen (2008)
Rockstroh, B., Kappes, W., Walte, F., Bulavinov, A., Bessert, S., Bähr, W., ...
Detection indentification of concealed dangerous objects an substances (2008)
Ratius, B., Metzler, G., Sklarczyk, C., Altpeter, I., Dobmann, G., Kröning, M.
Police authorities and security providers face an increasing need for precise detection and identification of dangerous and illegal objects like weapons and explosives, which are hidden under the...
Application of new front-end electronics for non-destructive testing of railroad wheel sets (2007)
Kappes, W., Rockstroh, B., Bähr, W., Kröning, M., Rodner, C., Goetz, J., ...
For more than 6 years, the automated ultrasonic and eddy-current systems for the inspection of railroad wheel sets, developed by Fraunhofer IZFP and Fraunhofer TEG, have been field-hardened through...
New ultrasound testing systems for the production testing of rail wheels (2007)
Rockstroh, B., Walte, F., Kappes, W., Bessert, S., Kröning, M., Dath, R., ...
Previous standards for the manufacturing inspection of railroad wheels using ultrasound, such as UIC 812, have been replaced by new standards, for example EN 13262 and RD32.144-2000, both requiring...
Dobmann, G., Bulavinov, A., Kröning, M., Kurz, J.H.
Starting with the damage tolerance design of structures in aerospace applications [1] it became obvious: NDT procedures, utilized according to standards in the regulated area and according to...
Dobmann, G., Bulavinov, A., Kröning, M., Kurz, J.H.
Starting with the damage tolerance design of structures in aerospace applications [1] it became obvious: NDT procedures, utilized according to standards in the regulated area and according to...
EMUS-Prüfsystem für Pipelineprüfungen während Reparaturarbeiten (2007)
Surkova, N., Kröning, M., Niese, F., Aljoschin, N., Syrkin, N.
Das Fraunhofer IZFP, Saarbrücken, hat in Kooperation mit der Baumann-Universität, Moskau, ein Prototyp-Prüfsystem für die koppelmittelfreie Ultraschalluntersuchung von Rohrleitungen an der...
Pinchuk, R., Kröning, M., Sklarczyk, C., Paul, W.J.
A large number of microwave sensors are available on the market today. Unfortunately, sensors of high quality are very expensive and tend to be stationary, making them unsuitable for integrating into...
Bernus, L. Von, Bulavinov, A., Hanke, R., Joneit, D., Kröning, M., Reddy, K.M.
Der 'getaktete Gruppenstrahler' ermöglicht neuartige Ansätze bei der Entwicklung und Anwendung von Ultraschallprüfsystemen. Es wurde im IZFP eine Entwicklungsplattform gebaut, mit...
Bernus, L. Von, Bulavinov, A., Hanke, R., Joneit, D., Kröning, M., Reddy, K.M.
Der 'getaktete Gruppenstrahler' ermöglicht neuartige Ansätze bei der Entwicklung und Anwendung von Ultraschallprüfsystemen. Es wurde im IZFP eine Entwicklungsplattform gebaut, mit folgenden...
EMUS-Prüfsystem für Pipelineprüfungen während Reparaturarbeiten (2007)
Surkova, N., Kröning, M., Niese, F., Aljoschin, N., Syrkin, N.
Das Fraunhofer IZFP, Saarbrücken, hat in Kooperation mit der Baumann-Universität, Moskau, ein Prototyp-Prüfsystem für die koppelmittelfreie Ultraschalluntersuchung von Rohrleitungen an der...
Pinchuk, R., Kröning, M., Sklarczyk, C., Paul, W.J.
A large number of microwave sensors are available on the market today. Unfortunately, sensors of high quality are very expensive and tend to be stationary, making them unsuitable for integrating into...
Junker, J., Schuhmacher, S., Szielasko, K., Altpeter, I., Kröning, M.
Nitrierverfahren bieten die Möglichkeit der partiellen Behandlung von Bauteilen, beispielsweise wenn eine hohe Härte und Verschleißfestigkeit nur in bestimmten Bereichen der Randschicht eines...
Bernus, L. Von, Bulavinov, A., Hanke, R., Joneit, D., Kröning, M., Reddy, K.M.
In der Luft- und Raumfahrt werden Geometrien und Materialien verwendet, die aus Sicht der klassischen Ultraschallprüfung als schwer prüfbar gelten. Beispielsweise sind die Rückwände oft nicht...
Neue Algorithmen für die dynamische Thermographie und ihre Anwendung (2007)
Lugin, S., Kröning, M., Netzelmann, U.
Für die Pulsthermographie werden neue Algorithmen für die Rekonstruktion der Fehlerform und für die Datenkompression vorgeschlagen. Der Algorithmus für die Rekonstruktion der Fehlerform basiert...
Junker, J., Schuhmacher, S., Szielasko, K., Altpeter, I., Kröning, M.
Nitrierverfahren bieten die Möglichkeit der partiellen Behandlung von Bauteilen, beispielsweise wenn eine hohe Härte und Verschleißfestigkeit nur in bestimmten Bereichen der Randschicht eines...
Bernus, L. Von, Bulavinov, A., Hanke, R., Joneit, D., Kröning, M., Reddy, K.M.
In der Luft- und Raumfahrt werden Geometrien und Materialien verwendet, die aus Sicht der klassischen Ultraschallprüfung als schwer prüfbar gelten. Beispielsweise sind die Rückwände oft nicht...
Neue Algorithmen für die dynamische Thermographie und ihre Anwendung (2007)
Lugin, S., Kröning, M., Netzelmann, U.
Für die Pulsthermographie werden neue Algorithmen für die Rekonstruktion der Fehlerform und für die Datenkompression vorgeschlagen. Der Algorithmus für die Rekonstruktion der Fehlerform basiert...
Dobmann, G., Altpeter, I., Kröning, M., Ratius, B., Sklarczyk, C.
The concept of a system for standoff detection of concealed hazardous objects like explosives, weapons or drugs is presented. It is based on a combination of three-dimensional imaging of innocuous...
Characterisation of steels with microdefects using a laser interferometry technique (2007)
Zhitluhina, J.V., Perov, D.V., Rinkevich, A.B., Smorodinsky, Y.G., Kröning, M., Permikin, V.S.
Low microdefect level is essential for ensuring the performance of material. Early detection of microdefect areas allows the estimation of the residual life of constructions and prevents catastrophic...
Ultrasonic inspection of austenitic and dissimilar welds (2007)
Bulavinov, A., Kröning, M., Liu, J., Walte, F., Reddy, K.M., Ribeiro, J.G.
Ultrasonic testing requires materials that are acoustically isotropic. The sound propagation is assumed to be non-dispersive and independent of its direction. Finegrained steel qualities meet these...
Progress in NDT system engineering through sensor physics and integrated efficient computing (2007)
Kröning, M., Ribeiro, J.G., Vidal, A.
Nondestructive testing (NDT) system engineering is comprised of different technologies, primarily measurement physics, computing, electronics, mechanical engineering and automation. Significant...
Organization of NDE centers: The Brazilian Center for nondestructive evaluation (CAND) (2007)
Braga, S., Ribeiro, J.G., Soares, L., Kröning, M.
The assurance of technical safety and quality of materials, parts and components during production and operation, along with monitoring and control of structural health processes and other scenarios,...
Nondestructive evaluation of ageing steel structures (2007)
Altpeter, I., Kröning, M., Ribeiro, J.G.
Usually, materials are inspected by nondestructive methods to detect and evaluate defects that may cause failure under the designed operation conditions. However, the structure may also fail due to...
Die Getaktete Gruppenstrahlertechnik und ihre Anwendungen (2007)
Bulavinov, A., Joneit, D., Kosov, S., Kröning, M., Pinchuk, R., Pudovikov, S., ...
Die automatisierte Ultraschallprüfung ersetzt zunehmend die manuell durchgeführte Prüfung. Die Verfügbarkeit immer preiswerterer und leistungsstärkerer Bauelemente der Mikroelektronik und der...
Prüflinien für die Radsatzinstandhaltung und die Räder- oder Radreifenproduktion (2007)
Rockstroh, B., Kappes, W., Walte, F., Kröning, M., Schallert, R., Berndt, D., ...
Um die geforderte Qualität von Rädern, Radreifen, Radsätzen und Ringen nachzuweisen, sind u. a. Ultraschallprüfungen und Härtemessungen im Herstellungsprozess durchzuführen. Die...
Ultrasonic inspection of austenitic and dissimilar welds (2007)
Bulavinov, A., Kröning, M., Liu, J., Walte, F., Reddy, K.M., Ribeiro, J.G.
Ultrasonic testing requires materials that are acoustically isotropic. The sound propagation is assumed to be non-dispersive and independent of its direction. Finegrained steel qualities meet these...
Progress in NDT system engineering through sensor physics and integrated efficient computing (2007)
Kröning, M., Ribeiro, J.G., Vidal, A.
Nondestructive testing (NDT) system engineering is comprised of different technologies, primarily measurement physics, computing, electronics, mechanical engineering and automation. Significant...
Organization of NDE centers: The Brazilian Center for nondestructive evaluation (CAND) (2007)
Braga, S., Ribeiro, J.G., Soares, L., Kröning, M.
The assurance of technical safety and quality of materials, parts and components during production and operation, along with monitoring and control of structural health processes and other scenarios,...
Nondestructive evaluation of ageing steel structures (2007)
Altpeter, I., Kröning, M., Ribeiro, J.G.
Usually, materials are inspected by nondestructive methods to detect and evaluate defects that may cause failure under the designed operation conditions. However, the structure may also fail due to...
Die Getaktete Gruppenstrahlertechnik und ihre Anwendungen (2007)
Bulavinov, A., Joneit, D., Kosov, S., Kröning, M., Pinchuk, R., Pudovikov, S., ...
Die automatisierte Ultraschallprüfung ersetzt zunehmend die manuell durchgeführte Prüfung. Die Verfügbarkeit immer preiswerterer und leistungsstärkerer Bauelemente der Mikroelektronik und der...
Verfahren zur Bestimmung der Restlebensdauer und/oder des Ermuedungszustandes von Bauteilen (2007)
Schreiber, J., Kröning, M., Jefgenevitsch Panin, V.
WO 2008080395 A2 UPAB: 20080731 NOVELTY - The method involves determining a stress amplitude on a component in a locally defined manner within characteristic time intervals with load cycles per time...
Sampling phased array - A new technique for signal processing and ultrasonic imaging (2007)
Kröning, M., Bulavinov, A., Reddy, K.M., Bernus, L. Von, Joneit, D.
Different signal processing and image reconstruction techniques are applied in ultrasonic non-destructive material evaluation. In recent years, rapid development in the fields of microelectronics and...
Prüflinien für die Radsatzinstandhaltung und die Räder- oder Radreifenproduktion (2007)
Rockstroh, B., Kappes, W., Walte, F., Kröning, M., Schallert, R., Berndt, D., ...
Um die geforderte Qualität von Rädern, Radreifen, Radsätzen und Ringen nachzuweisen, sind u. a. Ultraschallprüfungen und Härtemessungen im Herstellungsprozess durchzuführen. Die...
Ultrasonic testing of austenitic and dissimilar welds - state of the art and current R&D (2007)
Bulavinov, A., Kröning, M., Pudovikov, S., Reddy, K.M., Walte, F.
Kröning, M., Bulavinov, A., Pinchuk, R.
WO 2009065369 A1 UPAB: 20090609 NOVELTY - The method involves providing a set of microwave antenna units (1) in a spatial distribution around an object (P) to be detected, where the antenna units are...
Helfen, L., Myagotin, A., Baumbach, T., DiMichiel, M., Kröning, M.
9th European Conf.on Non-Destructive Testing (ECNDT), Berlin, September 25-29, 2006
Prüflinien für die Räder- oder Radreifenproduktion bzw. Radsatzinstandhaltung (2006)
Rockstroh, B., Kappes, W., Walte, F., Kröning, M., Schallert, R., Treppschuh, F., ...
Für die Prüfung von Eisenbahnrädern im Herstellungsprozess werden mehrere Prüfmaschinen in einer Linie angeordnet. Diese arbeiten im Produktionszyklus der Radherstellung. Die Prüf- bzw. Messzeit...
Sampling phased array a new technique for signal processing and ultrasonic imaging (2006)
Bulavinov, A., Joneit, D., Kröning, M., Bernus, L., Dalichow, M.H., Reddy, K.M.
Different signal processing and image reconstruction techniques are applied in ultrasonic non-destructive material evaluation. In recent years, rapid development in the fields of microelectronics and...
Sampling phased array application for immersion technique (2006)
Kudalkar, V.N., Kröning, M., Reddy, K.M., Bulavinov, A.
The principles of phase controlled excitation and processing of ultrasonic signals are used in nondestructive testing and medical diagnostics. A phased array system is a multi channel ultrasonic...
Pirlog, M., Schnubel, D., Altpeter, I., Dobmann, G., Kröning, M.
Micro residual stresses (MRS) of the 2nd and 3rd order play an important role in the lifetime analysis of thermally-cycled materials. The coherent residual stresses (MRS of 3rd order) appear when the...
Quantitative ultrasonic testing of pressurized components using sampling phased array (2006)
Bulavinov, A., Dalichow, M.H., Kröning, M., Kurz, J.H., Walte, F., Reddy, K.M.
Ultrasonic testing and evaluation procedures typically depend on reference reflectors to establish detection sensitivity and evaluation of test data. Rules and regulations governing safety-related...
Influences on the part quality in conventional deep drawing processes (2006)
Altpeter, I., Kopp, M., Kröning, M., Milch, M., Schäffner, C.
Trends in the automotive industry tend towards safety, fuel saving and reduction of exhaust gas result in an increased application of high strength steels as well as stainless steels in the car body...
NDE and knowledge engineering - a growing partnership (2006)
Certified quality of goods, products and services and the safe use and operation of technical systems are the backbone of any successful industrial activity. The internationalization of markets and...
Helfen, L., Myagotin, A., Baumbach, T., Dimichel, M., Kröning, M.
Due to increasing packing density and ongoing miniaturization there is a growing need for non-destructive quality assurance of devices in microsystem technology, especially for techniques providing...
Kröning, M., Bulavinov, A., Walte, F., Reddy, K.M., Dalichow, M.H.
The ability to perform nondestructive testing of stainless steel piping and dissimilar metal joints in excess of 10.0mm (.4'')wall thickness is very limited. In particular the use of ultrasound to...
New ultrasound testing systems for the production testing of rail wheels (2006)
Rockstroh, B., Walte, F., Kappes, W., Bessert, S., Kröning, M., Schäfer, W., ...
Previous standards for the manufacturing inspection of railroad wheels using ultrasound, such as UIC 812, have been replaced by new standards, for example EN 13262 and RD32.144-2000, both requiring...
Application of new front-end electronics for non-destructive testing of railroad wheel sets (2006)
Kappes, W., Rockstroh, B., Bähr, W., Kröning, M., Rodner, C., Goetz, J., ...
For more than 6 years, the automated ultrasonic and eddy-current systems for the inspection of railroad wheel sets, developed by Fraunhofer IZFP and Fraunhofer TEG, have been field-hardened through...
Ultraschallprüfsysteme für die Produktionsprüfung von Eisenbahnrädern (2006)
Rockstroh, B., Walte, F., Kappes, W., Bessert, S., Kröning, M., Schäfer, W., ...
In both passenger and freight operation, railway wheels are subject to high dynamic stresses. Highspeed passenger services as well as the transport of cost-intensive and hazardous freight put a...
Basis- and in-service-inspection of track and vehicle components of the transrapid (2006)
Rockstroh, B., Kröning, M., Dobmann, G., Kappes, W., Walte, F., Kretzschmar, F.
Everybody knows: technical components are designed to reliably guarantee a certain lifetime and the design rules have to consider every possible influence by mechanical static and/or cyclic loading...
Kröning, M., Reddy, K., Bulavinov, A., Bernus, L. Von, Joneit, D., Jager, W.
Different signal processing and image reconstruction techniques are applied in ultrasonic non-destructive material evaluation. In recent years, rapid development in the fields of microelectronics and...
Nondestructive testing of pressurized components - a quantitative approach (2006)
The development of physical measurement and testing technology allows for advancements of quantitative NDT (Nondestructive Testing) techniques that promise valuable, quantifiable contributions to...
Nikiforenko, G., Bulavinov, A., Kröning, M., Jager, W., Reddy, K.
The non-destructive testing of pipeline systems under maintenance is an important task. Improving the testing system sensitivity will improve the accuracy of residual lifetime predictions. This leads...
A linear magnetic stray flux array based on GMR gradiometers (2006)
Kloster, A., Kröning, M., Smorodinsky, J., Ustinov, V.
The dramatic increase in storage density in magnetic media had a strong impact on the development of new sensor concepts for measurement of weak magnetic fields. Two prerequisites were...
Bulavinov, A., Kröning, M., Reddy, K.M., Walte, F.
Dickwandige (>10mm Wanddicke) Schweißverbindungen in austenitischen Rohrleitungen und Anschlussnähte, die als Mischverbindungen ausgeführt sind, sind nur eingeschränkt mit zerstörungsfreien...
Quantitative US-Prüfung an druckführenden Komponenten mit getaktetem US-Gruppenstrahler (2006)
Bulavinov, A., Kröning, M., Kurz, J.H., Reddy, K.M., Walte, F.
US-Prüfungen werden an Hand von Bezugsreflektoren in ihrer Nachweisempfindlichkeit eingestellt und bewertet. Dabei wird zumindest für Komponenten von großer sicherheitstechnischer Bedeutung im...
Comparative analysis of tomography based on transmitted and scattered X-rays (2006)
A comparative analysis of the physical foundations of tomography based on transmitted and scattered X-rays is presented. Comparative estimates of the effects of the object's features, radiation...
Sampling phased array - a new technique for signal processing and ultrasonic imaging (2006)
Bernus, L. Von, Bulavinov, A., Dalichow, M., Joneit, D., Kröning, M., Reddy, K.M.
Gorshkov, V.A., Kröning, M., Kirilenko, K.G.
The possibility of using single-sided photon injection to reconstruct a tested object structure on the basis of the intensity of backscattered noncollimated radiation is considered. The...
Verfahren zur ortsaufgelösten, zerstörungsfreien Werkstückuntersuchung (2006)
Bernus, L., Kröning, M., Boulavinov, A., Reddy, K., Yastrebova, O., Kudalkar, V.
DE 102006027182 A1 UPAB: 20071129 NOVELTY - The method involves determining a movement trajectory on the basis of comparison of measuring signals received at a position (2) with respect to an initial...
Sampling phased array a new technique for signal processing and ultrasonic imaging (2006)
Bulavinov, A., Joneit, D., Kröning, M., Bernus, L., Dalichow, M.H., Reddy, K.M.
Different signal processing and image reconstruction techniques are applied in ultrasonic non-destructive material evaluation. In recent years, rapid development in the fields of microelectronics and...
Sampling phased array application for immersion technique (2006)
Kudalkar, V.N., Kröning, M., Reddy, K.M., Bulavinov, A.
The principles of phase controlled excitation and processing of ultrasonic signals are used in nondestructive testing and medical diagnostics. A phased array system is a multi channel ultrasonic...
Pirlog, M., Schnubel, D., Altpeter, I., Dobmann, G., Kröning, M.
Micro residual stresses (MRS) of the 2nd and 3rd order play an important role in the lifetime analysis of thermally-cycled materials. The coherent residual stresses (MRS of 3rd order) appear when the...
Quantitative ultrasonic testing of pressurized components using sampling phased array (2006)
Bulavinov, A., Dalichow, M.H., Kröning, M., Kurz, J.H., Walte, F., Reddy, K.M.
Ultrasonic testing and evaluation procedures typically depend on reference reflectors to establish detection sensitivity and evaluation of test data. Rules and regulations governing safety-related...
Kröning, M., Bulavinov, A., Walte, F., Reddy, K.M., Dalichow, M.H.
The ability to perform nondestructive testing of stainless steel piping and dissimilar metal joints in excess of 10.0mm (.4'')wall thickness is very limited. In particular the use of...
Application of new front-end electronics for non-destructive testing of railroad wheel sets (2006)
Kappes, W., Rockstroh, B., Bähr, W., Kröning, M., Rodner, C., Goetz, J., ...
For more than 6 years, the automated ultrasonic and eddy-current systems for the inspection of railroad wheel sets, developed by Fraunhofer IZFP and Fraunhofer TEG, have been field-hardened through...
Kröning, M., Kazak, N., Mashenko, A., Ropot, P.
DE 102006056022 A1 UPAB: 20080627 NOVELTY - The device has an electro-optical unit (1) with light inflow and outflow surfaces (1', 1'') facing along an optical axis penetrating towards the...
Kröning, M., Bulavinov, A., Reddy, K., Bernus, L.
WO 2008071272 A2 UPAB: 20080721 NOVELTY - For the non-destructive testing of a body, ultrasonic waves from at least one transducer are transmitted into the body structure through its surface and a...
Kröning, M., Besse, I., Baumbach, T., Berthold, A., Melkadze, R.G., Lezhneva, T.M., ...
For the last decade a tremendous development in the field of imaging radiation detectors has taken place. Conventional X-ray film has been replaced by digital X-ray imaging systems in a number of...
Influences on the part quality in conventional deep drawing processes (2005)
Behrens, B., Yun, J., Schäffner, C., Sundkötter, C., Kröning, M., Altpeter, I., ...
Trends in the automotive industry tend towards safety, fuel saving and reduction of emissions. This leads to an increased application of higher-and high strength steels in car body production. One...
Sensor modules for structural health monitoring and reliability of components (2005)
Kröning, M., Berthold, A., Meyendorf, N.
Safety and availability of ageing infrastructures require periodic or continuous monitoring of the structure's integrity. Innovative design criteria for new infrastructure components may allow...
X-ray scattering tomography (2005)
Gorshkov, V., Kröning, M., Anosov,Y., Dorjgochoo, O.
This paper discusses issues related to the development of reconstructed tomography based on scattered X-ray radiation. For most X-ray tomography, based on collimated initial and scattered radiation,...
Neue Prüfsysteme für die Eisenbahnradprüfung und Radsatzwellenprüfung (2005)
Rockstroh, B., Kappes, W., Walte, F., Bessert, S., Kröning, M., Montnacher, J., ...
Seit mehr als 5 Jahren haben sich Radsatzprüfanlagen vom Typ AURA im harten Prüfbetrieb in den Instandhaltungswerken der Deutschen Bahn AG bewährt. Die Unterflurprüfeinrichtungen, UFPE, sind seit...
Cioclov, D., Dobmann, G., Kröning, M.
Die quantitative zerstörungsfreie Prüfung (QZFP) hat besondere Bedeutung bei Fragen der Lebensdauerabschätzung von Komponenten, wenn sie sich ihrem "Design-End-Of-Life" nähern. Werden in diesem...
Werkstoffprüfung mit neuen Sensoren (2005)
Die zerstörungsfreie Werkstoffprüfung (ZfP) entwickelt sich methodisch und technisch entsprechend den Prüfanforderungen. Neue Werkstoffe, der Bedarf an quantitativen Prüfergebnissen, das...
Rockstroh, B., Kappes, W., Walte, F., Dobmann, G., Kröning, M., Kretzschmar, F.
Mit dem Vortrag wird über die Einsatzmöglichkeiten der ZfP berichtet, die bereits Anwendung bei der ICE-Fahrzeugtechnik findet und für die Überwachung der Festen Fahrbahn untersucht wird. Es...
Micro-magnetic evaluation of residual stresses of the 2nd and 3rd order (2005)
Pirlog, M., Szielasko, K., Altpeter, I., Dobmann, G., Kröning, M.
Micro residual stresses of the second and third order play an important role in the fracture mechanical analysis of thermally-cycled materials, and thus in lifetime analysis of such effected...
Slow relaxation of metal-hydrogen systems (2004)
Chernov, I., Nikitenkov, N.N., Tjurin, Y., Semenov, A., Kröning, M., Baumbach, H.
Boulavinov, A., Kröning, M., Nikiforenko, G., Rockstroh, B., Jager, W., Rost, P.
Es wurde ein Prüfverfahren zur EMUS-Rohrprüfung mittels eines phasenbelegten Prüfkopfsystems präsentiert. Die hohe Prüfempfindlichkeit wird durch speziell ausgelegte EMUS-Sensoren mittels...
The potential and need for NDT innovations (2004)
Kröning, M., Aleshin, N., Naumo, L., Meyendorf, N., Raj, B., Smorodinski, Y.
Usually, innovations in NDT are part of many main-stream, state-of-the-art development efforts in science and technology and applicable regulations, codes and standards often significantly slow down...
International science and technology center: A decade of joint efforts for a safer world (2004)
Ten Years have passes since the basic agreement estblishing the ISTC was concluded. Eight years have gone by since the ISTC first began operations. On each of its anniversaries the ISTC has...
Method of EMA-control of pipelines with insulation coatings (2004)
Nikiforenko, Z., Boulavinov, A., Jager, W., Rockstroh, B., Kröning, M., Eichhorn, K., ...
Non-destructive testing of piping in operation is an urgent task, requiring development of new methods of control, oriented to the current condition of the plants. Control of welded joints in this...
Relaxationsprozesse im Dünnfilmsystem H-TI/AL (2003)
Chernov, I., Nikitenkov, N.N., Tjurin, Y., Semenov, A., Kröning, M., Baumbach, H.
Nikitenkov, N.N., Chernov, I., Tjurin, Y., Semenov, A., Kröning, M., Baumbach, H.
The changes in thin-film "titanium-over-aluminium-hydrogen" system when it transfers in a state of a thermodynamic equilibrium at ambient temperature during long time (2 months) after hydrogen...
Chernov, I., Nikitenkov, N.N., Tjurin, Y., Lider, A., Kröning, M., Baumbach, H.
Dynamics of hydrogen accumulation in plastically strained specimens of titanium and stainless steel has been investigated with the help of the methods of thermo-stimulated desorption and secondary...
Linear magnetic stray flux array based on GMR gradiometers (2002)
Kloster, A., Kröning, M., Smorodinsky, J., Ustinov, V.
A drastic increase in storage density of magnetic media had a strong impact on the development of new sensor concepts for the measurement of weak magnetic fields. Two prerequisites were the...
Speicherung und Beseitigung von Wasserstofffehlern bei Strahlen- und Wärmebearbeitung (2002)
Chernov, I., Cherdantzev, Y., Lider, A., Tyurin, Y., Surkov, A., Kröning, M., ...
By the means of electron-positron annihilation method, defects formation in titanium under electrolytic hydrogen charging from LiOH+H2O solution has been studied. Effects of thermal annealing and...
Phase controlled EMAT antenna for the inspection of coated pipes (2002)
Boulavinov, A., Kröning, M., Nikiforenko, G., Smorodinsky, J.
The new inspection technique for the testing of pipes and pipelines by the EMAT-antenna was demonstrated. The technique allows carrying out fast pipeline inspection. It was shown, that the pipes with...
X-ray imaging systems for NDT and general applications (2002)
Kröning, M., Hirsch, O., Shulgin, B., Raikov, D., Kidibaev, M., Koroleva, T., ...
Real-time digital image processing based on digital sensor arrays opens completely new application areas for X-ray inspections. Exciting developments are underway, and new dimensions of X-ray imaging...
Dobmann, G., Kröning, M., Surkowa, N., Bernus, L. Von, Wolter, B.
Hydrogen nuclear magnetic resonance (1H NMR) is a direct method to determine the hydrogen content and with it the water content (moisture) in solids. Simultaneous it is highly sensitive probe of...
Aleshin, N., Altpeter, I., Dobmann, G., Kröning, M., Reddy, K.
Service induced degradation of material properties is the main limiting factor for the operating life time of components and structures such as pressure vessels and pipelines. Degradation of the...
Surkov, A., Altpeter, I., Netzelmann, U., Baumbach, H., Dobmann, G., Chernov, I., ...
Influences of irradiation (by electrons and X-rays), hydrogen absorption and plastic deformation on the defect structure of titanium and steel are investigated by means of positron annihilation,...
Altpeter, I., Kühn, S., Kopp, M., Arnold, W., Kröning, M.
Increasing miniaturization of micromechanic and microelectronic components has directed intensified attention to residual stress measurements with high lateral resolutions. The fundamentals for a...
Transportation: NDT of structural parts (2001)
Nondestructive testing (NDT) and evaluation has become very important in the transportation industries. NDT is indispensable, particularly when safety-relevant proof for the protection of the public...
Chernov, I., Cherdantzev, Y., Lider, A., Garanin, G., Kröning, M., Baumbach, H.
The surface condition of titanium and stainless steel during electrolytical charge in LiOH+H2O solution were studied by optical and scanning electron microscopy. It is shown that hydrogen charge...
Die Akkumulation von Defekten in Titan, nach elektrolytischer Wasserstoffsättigung (2001)
Chernov, I., Cherdantzev, Y., Lider, A., Garanin, G., Kröning, M., Baumbach, H.
The hydrogen influence on dynamics of defects formation in VT1-0 titanium was studied. Studying surface of titanium used as cathodes at an electrolytic hydrogen charge from LiOh+H2O solution was...
Chernov, I., Cherdantzev, Y., Lider, A., Garanin, G., Kröning, M., Baumbach, H.
The data on influence of hydrogen concentration in stainless steel 316 upon defects formation and defects accumulation during hydrogen electrolytic charge from LiOh+H2O solution are presented. The...
Investigation of the Dynamics of Defect Accumulation During Hydrogen Charge of Titanium (2001)
Chernov, I., Cherdantzev, Y., Lider, A., Garanin, G., Surkov, A.S., Nikitenkov, N.N., ...
The hydrogen influence on the dynamics of defect formation in VTI-0 titanium was studied. Studying surface states of titanium used as cathodes at an electrolytic hydrogen charge from LiOH+H2O...
Die Erosion der Oberfläche von rostfreiem Stahl und Titan nach Wasserstoffsättigung (2001)
Chernov, I., Cherdantzev, Y., Lider, A., Garanin, G., Kröning, M., Baumbach, H.
Dynamics of Defect Accumulation During Hydrogen Charge of Stainless Steel (2001)
Chernov, I., Cherdantzev, Y., Lider, A., Garanin, G., Surkov, A., Nikitenkov, N.N., ...
The data on the influence of hydrogen concentration in stainless steel 316 upon defect formation and defect accumulation during hydrogen electrolytic charge from LiOH+H2O solution are presented. The...
Quantitative flaw sizing using 3D-CAD Ray-SAFT (2001)
Schmitz, V., Chakhlov, S.V., Kröning, M.
In sizing defects, tomographic methods such as the Syntehtic Aperture Focusing Technique (SAFT) can be used where the time of flight of the received ultraonic signals plays a more important role than...
Arnold, W., Gebhardt, W., Licht, R., Kröning, M.
In 2003 the ROSETTA space mission to Comet 46P/Wirtanen will be launched by the European Space Agency (ESA). On board of the spacecraft will be a lander in order to carry out measurements on the...
Schmitz, V., Kröning, M., Roos, E., Blind, D., Eisele, U.
The proof of safety for reactor components is generally based on non-destructive testing results, which much be evaluated in reference to their safety relevance. The use of fracture mechanics...
Altpeter, I., Kühn, S., Kopp, M., Arnold, W., Kröning, M., Zehetbauer, M.
Die zunehmende Miniaturisierung von Bauteilen in der Mikromechanik und auch in der Mikroelektronik führt zu einem verstärkten Interesse an Eigenspannungsmessungen mit hoher lateraler Auflösung. Im...
Neue Möglichkeiten des zerstörungsfreien Prüfverfahrens "Akustische Emission" (2000)
Kühnicke, H., Reutter, O., Schubert, F., Haupt, L., Kröning, M.
Die Weiterentwicklung der Messtechnik und ein besseres Verständnis der Quellmechanismen und Ausbreitungseffekte können heute die Aussagekraft von Schallemissionsmessungen erhöhen. Inverse...
Micromagnetic Determination of Thermal-Induced Residual Stresses in Steel and White Cast Iron (2000)
Altpeter, I., Becking, R., Kern, R., Kröning, M., Hartmann, S.
Development of micromagnetic nondestructive method to estimate the thermally induced stress in multiphase magnetic system has been described in this paper. The method is based on interaction of...
Computed Laminography and its Applications (2000)
Gondrom, S., Maisl, M., Reiter, H., Cloetens, P., Kröning, M.
X-ray irradiation is well known as a non-destructive testing method for technical components. Using a simple irradiation technique one doesn't get information about the depth of the imaged...
The paper presents a methodology that aims towards the integration of nondestructive inspection (NDI) quality as quantified by the probability of detection (POD), into a probabilistic failure...
Strahlenstimulierte Wasserstoffemission aus Metallen (2000)
Tjurin, Y.I., Chernov, I., Kröning, M., Baumbach, H.
Im vorliegenden Buch sind die physikalischen Grundlagen der Nichtgleichgewichts-vorgänge der Migration und des Austritts von Wasserstoffisotopen aus Metallen und Legierungen unter der...
Rao, B., Raj, B., Jayakumar, T., Kalyanasundaram, P., Arnold, W., Kröning, M.
Eddy current test is a simple, versatile, fast and high sensitivity non-destructive evaluation technique widely used for detection and characterisation of surface and sub-surface defects in austentic...
Synthetic Aperture Focusing Technique 3D-CAD-SAFT (2000)
Schmitz, V., Kröning, M., Chakhlov, S., Fischer, W.
Synthetic Aperture Focusing Techniques (SAFT) have been developed for acoustic imaging of macroscopical defects for Inservice Inspection (ISI) of Light Water Reactors (LWR). In the following the case...
Modelling of Sound Fields through Austenitic Welds (2000)
Schmitz, V., Kröning, M., Chakhlov, S.
The propagation of ultrasonic waves through austenitic welds is disturbed by the anisotropic and inhomogeneous structure of the material. The effect is more or less severe depending upon the kind of...
Fractal microstructures in hydrating cement paste (1999)
Heinemann, A., Hermann, H., Wetzig, K., Häussler, F., Baumbach, H., Kröning, M.
Gondrom, S., Zhou, J., Maisl, M., Reiter, H., Kröning, M., Arnold, W.
Computed laminography (CL) is an image forming method of X-ray testing that yields images of object slices by a simple linear translation of the object relative to the tube-detector system. No...
Änderung der Isotopenzusammensetzung von Metallen bei der Wasserstoffsättigung (1999)
Chernov, I., Nikitenkov, N.N., Puchkarea, L.N., Kolobov, Y.P., Kröning, M., Baumbach, H.
Probabilistic fracture mechanics approach to pressure vessel reliability evaluation (1999)
The paper introduces basic mathematical tools to describe material fracture as a probabilistic event. Materials fracture toughness, size and distribution of preexisting flaws and the stochastic...
Hydrogen Migration and Release in Metals and Alloys at Heating and Radiation Effects (1999)
Chernov, I., Tyurin, Y., Cherdantzev, Y., Kröning, M., Baumbach, H.
Deuterium and hydrogen migration and release have been studied in stainless steel, niobium, palladium during accelerated electrons and 14N ions. It was shown that radiation stimulates the intensive...
Changes in Isotopic Composition of Metals Enriched in Hydrogen (1999)
Chernov, I., Nikitenkov, N.N., Puchkarea, L.N., Kolobov, Y.R., Kröning, M., Baumbach, H.
We have studied changes in the isotopic composition of niobium and palladium as well as of titanium film structures over ceramics enriched in deuterium. We have also investigated changes in the...
Ultrasonic Inspection of Inhomogeneous Welds Simulated by Gaussian Beam Superposition (1999)
The presented Gaussian beam superposition technique allows for transducer field calculation in inhomogeneous anisotropic media. Due to the complex cuspidal shapes of the quasi-shear vertical (qSV)...
Debarberis, L., Kröning, M., Dobmann, G.
Within the frame of the European Network AMES (Ageing Materials Evaluation & Studies), several shared cost action projects are ongoing on understanding, assessment, mitigation of the ageing...
Schmitz, V., Kröning, M., Roos, E., Blind, D., Eisele, U.
Sicherheitsnachweise für Reaktorkomponenten basieren in der Regel auf Befunden der zerstörungsfreien Prüfung, die im Hinblick auf ihre sicherheitstechnische Relevanz bewertet werden müssen. Die...
Nachweis von Cu-Ausscheidungen mittels mikromagnetischer Prüfverfahren (1999)
Altpeter, I., Dobmann, G., Kern, R., Kröning, M., Lang, M., Meyendorf, N., ...
Der kupferlekierte ferritische Stahl WB 36 wird in deutschen Kraftwerken in großem Umfang als Rohrleitungswerkstoff und als Behälterwerkstoff eingesetzt. In einigen Fällen kam es nach langzeitigem...
Altpeter, I., Becking, R., Kern, R., Kröning, M., Hartmann, S.
Im Rahmen des DFG-Forschungsvorhabens "Mikromagnetische Ermittlung von thermisch induzierten Eigenspannungen in Stählen und weißem Gußeisen" wurde ein Prüfverfahren zur Ermittlung von thermisch...
Handbuch der Zerstörungsfreien Prüfung im Verlag R. Oldenbourg (1999)
Das Handbuch der Zerstörungsfreien Materialprüfung von E.A.W. Müller im Verlag R. Oldenbourg, München, steht in der Tradition der deutschen und mitteleuropäischen Ingineurausbildung und ist...
Sklarczyk, C., Kröning, M., Netzelmann, U., Karpen, W.
Mit Hilfe breitbandiger Mikrowellenmeßsysteme ist es möglich, Streukörper, die in eine Matrix anderer Zusammensetzung eingebettet sind, zu charakterisieren. diese Methoden wurden bislang in der...
Die in den vergangenen 10 Jahren durchgeführten verfahrens- und gerätetechnischen Entwicklungen zur zerstörungsfreien Charakterisierung von Gefügezuständen und zur Bestimmung von...
Artificial Neural Network for On-Line Eddy Current Testing (1999)
Rao, B.C., Raj, B., Kröning, M.
A new methodology has been proposed to carry on-line multifrequency eddy current testing. This uses a feed forward and error back propagation ANN in conjunction with on-line data acquistion. This...
Ziele und Ergebnisse der deutschen Reaktorsicherheitsvorsorgeforschung (1998)
Walte, F., Schmitz, V., Kröning, M., Schmülling, W.
Die bisher in den beiden Austenit-Forschungsprojekten erzielten Ergebnisse zeigen, daß der Ansatz, durch Modellierung der Impulsechoprüfung einen Beitrag zur Verbesserung der Ultraschallprüfung...
WS-Prüfungen mit großer Eindringtiefe (1998)
Becker, R., Kröning, M., Wüstenberg, H.
Das Niederfrequenz(NF)-Wirbestrom(WS)-Verfahrens wird eingesetzt, um eine große Eindringtiefe zu erzielen. die erreichbare Tiefenreichweite wird u.a. durch die niedrigste Prüffrequenz bestimmt, die...
Schneider, E., Arenz, U., Kröning, M., Mourik, N.
Da Wärmenachbehandlungen von Aluminiumschweißverbindungen nur sehr eingeschränkt möglich sind, kommt der Schweißvorbereitung und -durchfürhung große Bedeutung zu. Durch den Schweißprozeß...
Theoretical Evaluation of Ultrasonic Scattering by Flaws in Anisotropic Media (1998)
Ultrasonic inspection plays an important role in numerous industrial fields. One of the prominent tasks is the determination of location, shape, size and orientation of defects. In isotropic...
PC-based Systems for Ultrasonic and Eddy Current NDT (1998)
Dobmann, G., Dalichow, M.H., Kröning, M., Schmitz, V., Müller, W., Becker, R.
Now is the time to inroduce new quantitative NDT techniques, new evaluation procedures that use improved flaw sizing techniques and have linkage to fracture and/or fatigue mecahnics. These techniques...
Non-Destructive Testing and Process Control Using X-Ray Methods and Radioisotopes (1998)
Kröning, M., Jentsch, T., Maisl, M., Reiter, H.
This paper discusses the potential of two and three-dimensional computed X-ray tomography (CT), computed laminography (CL) and radiotracer techniques. The first and second methods non-destructively...
Elastic Wavefield Modeling for Arbitrarily Oriented Orthotropic Media (1998)
Composite materials have gained a considerable importance, being widely applied e.g. in aerospace industries as unidirectional, layered or woven structures. Through their complex build-up these...
Neue Entwicklungen in der Phased-Array-Technologie (1998)
Spies, M., Gebhardt, W., Kröning, M.
Die Phased-Array-Technik hat sich zu einem grundlegenden Werkzeug der Ultraschall-zfP entwickelt. Der Betrieb von elektromagnetisch angeregten Ultraschall-Prüfköpfen (EMUS) als Phased-Arrays (PAs)...
Bender, J., Kröning, M., Maisl, M., Meyendorf, N.
Non-destructive testing methods are based on physical interactions between the testing system and the material. Sensors are used in a number of testing processes which convert physical values into...
Anisotropic structural materials like fiber composites, but also columnar-grained stainless steels raise considerable problems for ultrasonic inspection due to the well-known wave propagation...
Surface analysis by nondestructive testing techniques (1997)
Kröning, M., Arnold, W., Häußler, F.
Nondestructive testing (NDT) goes beyond the determination of geometrical, physical, and chemical as well as technological parameters. In addition to this, measuring results are compared with...
Borgenstam, C.J., Hübschen, G., Kröning, M.
The UT of bimetallic and austenitic welds is strongly complicated by a high degree of elastic anisotropy and the coarse grain structure of the weld material and the buttering. Due to these facts up...
Probabilistic Assessment of Failure Risk in Load-Bearing Components (1997)
Cioclov, D., Kröning, M., Schmitz, V.
Recent achievements in non-destructive testing evaluation (NDE), mainly the numerical reconstruction of ultrasonic data into flaw images, has enabled an integration of fracture mechanics concepts...
Phased-Array-Optimierung für isotrope und anisotrope Strukturen (1997)
In vielen Bereichen der Ultraschall-Prüfung, insbesondere bei der Prüfung von dispersiven Materialien wie etwa austenitischem Stahl, kommen Winkelprüfköpfe zur Anwendung. Ausgelegt für den...
In Germany some older nuclear power plants are close to their designed end-of-life. Under the aspects of possible radiation damage in core-near id-surface areas of the pressure vessel cadding, it is...
Interpretation von Ultraschall-Abbildungen (1997)
Kröning, M., Müller, W., Schmitz, V.
During the evaluation of ultrasonic images, e.g. SAFT-reconstructed B-scan images (SAFT=Synthetic Aperture Focusing Technique) it is often difficult to decide, what is the origin of reconstructed...
Integration of NDT into life time management (1997)
Becker, R., Dobmann, G., Kröning, M., Reiter, H., Schneider, E.
Being a life management tool, non-destructive testing is designed to detect defects in components before they become critical under load. Non-destructive testing has consequently become a...
Development Trends in NDT (1997)
Calcamuggio, M., Dalichow, M.H., Kröning, M., Walte, F.
The future of NDT techniques and services will be shaped by the requirements of information transfer for global markets and resources. For long-term success, flexible productions need high security...
Kröning, M., Altpeter, I., Laub, U.
During the past few decades, cast iron manufacturers have been confronted with the problem of the tendency to chilling in critical cast iron components. The tendency to chilling refers to an...
Bildgebende und bildverarbeitende Verfahren in der zerstörungsfreien Werkstoffprüfung (1997)
Kröning, M., Maisl, M., Meyendorf, N., Rabe, U.
Die klassische Aufgabe der zerstörungsfreien Werkstoffprüfung ist es unzulässige Werkstoffinhomogenitäten oder unzulässige Abweichungen einer Werkstoffeigenschaft von einem Sollwert zu...
Ultraschallverfahren ermöglichen die zerstörungsfreie Bestimmung von Eigen- und Lastspannungen; angepaßte Verfahren und Geräte sind seit Jahren in industrieller Nutzung zur Bestimmung der...
Accelerated Space-Time Modeling of Quasi-Longitudinal Waves in Austenitic Weld Structures (1997)
For ultrasonic inspection of austenitic welds and cladded components mostly horizontally polarized shear waves and quasi-longitudinal (qP) waves are applied. Depending on the testing situation the...
Fern-Feld-Wirbelstrom - Eine Technik mit neuen Möglichkeiten (1996)
Debnar, A., Lucht, B., Becker, R., Kröning, M.
Wirbelstromprüfgeräte werden in vielfältiger Weise für die Prüfung von elektrisch leitfähigen Werkstoffen eingesetzt. Hauptsächliche Anwendungen sind beispielsweise die Fehlerprüfung,...
Die Einsatzmöglichkeiten zerstörungsfreier Prüfverfahren bei der Werkstoffentwicklung von Konstruktionskeramik in den Stadien Grünkeramik, Sintervorgang, Sinterkeramik an der Entwicklungsprobe...
It has been shown that on principle a dry ultrasonic inspection of thickwalled primary circuit components of nuclear power plants is possible using EMUS-probes. Investigations on test specimens have...
Tool Monitoring. An Example for Process Integrated Nondestructive Testing (1996)
New strategies for quality assurance in production engineering have shifted from the detection of product faults to the prevention of faults at an early stage. In many cases this target can only be...
Walte, F., Schurig, C., Spies, M., Klaholz, S., Kröning, M.
Simulationsmethoden wie GPSS and EFIT sind derzeit in der Lage, die Schallausbreitung (GPSS) sowie die Wechselwirkung des Schalls mit Fehlern (EFIT) in transversal-isotropen Materialien mit...
Simulation der Impulsecho-Prüfung für austenitische Schweißnähte (1996)
Walte, F., Schurig, C., Kröning, M.
Simulationsmethoden wie GPSS and EFIT sind derzeit in der Lage, die Schallausbreitung (GPSS) sowie die Wechselwirkung des Schalls mit Fehlern (EFIT) in transversal-isotropen Materialien mit...
Zhou, J., Maisl, M., Reiter, H., Kröning, M.
Laminographische Prüfverfahren sind für die schichtauflösende Untersuchung ebener, großflächiger Komponenten geeignet. Die hier vorgestellte Computerlaminographie zeichnet sich sich im Vergleich...
Process Integrated Nondestructive Testing for Evaluation of Hardness (1996)
Kröning, M., Theiner, W., Kern, R., Bucher, B., Meyer, R., Wolf, H.
With the help of new PINT sensors, product characteristics are evaluated which otherwise could only be determined so far by time-consuming and cost-intensive testing. These sensors would permit...
Nondestructive morphological characterization of latent and etched ion tracks in PETP by SANS (1996)
Häußler, F., Hempel, M., Birkholz, W., Baumbach, H., Kröning, M.
Solid state nuclear track detectors (SSNTD) are passive detectors for ionizing radation and can be used for the registration and identification of charged particles. The production of nuclear filters...
Nondestructive evaluation of material parameters using neural networks (1996)
Fiedler, U., Kröning, M., Theiner, W.
The general aim is the characterization of microstructural states and the determination of mechanical and technological parameters for 7 different steel grads used in nuclear power plants. In order...
Measurement of Wall-Thickness at Extreme Temperatures Using EMATs (1996)
Kröning, M., Smorodinski, Y., Mironenko, V., Bernus, L. Von
Electromagnetic Acoustic Transducers (EMAT) can be applied for temperatures ranging from very low minus numbers up to 1000 deg C. Reasons are the couplant free excitation of the ultrasound in the...
Measurement of adhesion strength using nonlinear acoustics (1996)
Kröning, M., Fassbender, S., Arnold, W.
Weak adhesion strength of delaminations can be detected qualitatively by conventional techniques such as the determination of the interface reflection coefficient of an ultrasonic of thermal wave....
International Division of Labour of Applied Research and Development (1996)
In view of an increasing globalization especially of industrial markets the importance of national markets is decreasing gradually. For industry this opens up great opportunities at high risks. The...
Integration of NDT into life time management (1996)
Becker, R., Kröning, M., Schneider, E., Reiter, H., Dobmann, G.
Being a life management tool, nondestructive testing is designed to detect defects in components before they become critical under load. Nondestructive testing has consequently become a...
High resolution photothermal imaging of metal matrix composite interface (1996)
Netzelmann, U., Disque, M., Kröning, M., Chen, F.C.
Using photothermal measurements as a new NDE method opens an application field of increasing interest for material characterization. As this high resolution micro-NDE especially applies to the near...
Composite materials have gained considerable industrial importance, being widely applied e.g. in aerospace industries. The need for their proper testing in view of delaminations, inclusions an other...
Kröning, M., Altpeter, I., Laub, U.
During the past few decades, cast iron manufacturers have been confronted with the problem of the tendency to chilling in critical cast-iron components. The tendency to chilling refers to an...
Design and optimization of a multifunctional phased array search unit (1996)
Spies, M., Kröning, M., Gebhardt, W., Dalichow, M.H.
Dual-element angle beam transducers exhibit operating characteristics suitable for alarge range of practical field applications, particularly for the interrogation of highly attenuative materials...
For ultrasonic inspection of austenitic welds and cladded components horizontally polarized shear (SH) waves have certain benefits compared with quasi-vertically polarized shear and quasi-pressure...
Characterization of green ceramics by microwaves and ultrasound (1996)
Kröning, M., Schneider, R., Netzelmann, U.
Time-of-flight measurements using ultrasound at 2 MHz and microwaves at 75-100 GHz were performed on samples of green state alumina. Spatially resolved measurements showed an inverse correlation of...
History and development of industrial applications of nondestructive testing technologies can be characterized by the needs for safe use of products respectively for operation of equipment to...
Becker, R., Kröning, M., Lucht, B., Csapo, G.
Das Potential des Niederfrequenz-Wirbelstromverfahrens beim Nachweis und bei der Beschreibung von Plattierungsfehlern wird hier durch Qualifizierungsmessungen und Einsätze in zwei Kernkraftwerken...
Die Auswertung von Fachtagungen, aber auch die Verfügbarkeit marktüblicher Techniken ergaben, daß der Schwerpunkt der Anwendung zerstörungsfreier Prüfverfahren die Bewertung von Wersktoffehlern...
Validation procedures for reliable quantitative defect detection based on modeling of NDT (1995)
Walte, F., Kröning, M., Spies, M., Klaholz, S.
Numerical modeling of ultrasonic inspections provides an important element of quantitative NDT by supporting the inspection design and evaluation of inspection data and gives better input data to...
Qualität durch Prozeßbeherrschung mit zerstörungsfrei arbeitenden Prüfmethoden (1995)
Im Bemühen um die Beherrschung von Prozessen kann die zerstörungsfreie Prüfung und Materialcharakterisierung wesentliche Hilfe anbieten. Die zerstörungsfreie und kontinuierliche Bestimmung von...
Inspection procedure assessment using modelling capabilities (1995)
Kappes, W., Kröning, M., Schmitz, V.
Before carrying out inspections at technical components, criteria have to be met to qualify the inspection procedure. The inspection qualification can be performed by technical justification or...
Salzburger, H.J., Hübschen, G., Kröning, M., Hesselmann, W.
Die Arbeiten haben die möglichen Einsatzbereiche der EMUS-Technik und die zu berücksichtigenden Worst-Case Bedingungen festgelgt. Anhand orientierender Labor-Untersuchungen unter den festgelegten...
Basierend auf einer Theorie der elastischen Wellenausbreitung in transversal-isotropen Medien wurde mit der Generalisierten Punktquellensynthese (GPSS) ein Verfahren entwickelt, das die Modellierung...
Zerstörungsfreie Prüfmethoden bei nichtrostenden Stählen (1994)
The integrity of welds, especially for high loaded components, is ensured since years by mean of NDT techniques like dye penetration, - magnetic particle, -x-ray, -eddy current and ultrasonic...
Trends in the development of systems for automated ultrasonic inspections (1994)
Kappes, W., Kröning, M., Neumann, R., Rieder, H., Bähr, W.
The ultrasonic inspection of primary circuit components represents an important part of the inservice inspection programme that is performed to guarantee nuclear power plant integrity. According to...
Häußler, F., Kröning, M., Baumbach, H.
Small-Angle Neutron Scattering (SANS) experiments on hadrating cement pastes and Solid State Nuclear Track Detectors (SSNTD) were given as a example for the non-destructive characterization of...
Becker, R., Both, N., Kröning, M.
The eddy current (EC) device available now at the IzfP represents the most modern state of the inspection technique, of the electronics and the processor development. Because of the modular concept...
Modeling and visualization of ultrasonic testing situations (1994)
Before carrying out inspections at technical components, criteria have to be met to qualify the inspection procedure. The inspection qualification can be performed by technical justification or...
Salzburger, H.J., Kröning, M., Hübschen, G.
The excitation and detection of ultrasound by conventional piezoelectric techniques doesn't provide the full range of elastic wave modes which can be used for NDT. Besides this there is a limitation...
Circumferential arrays used for UT endoscopy on heat exchanger tubes (1994)
Liebig, V., Köhler, K., Gebhardt, W., Kröning, M., Mummert, K.
Zertifizierte Prüfkompetenz - Applikation von F und E-Ergebnissen im europäischen Binnenmarkt (1993)
Kraus, S., Kröning, M., Weiß, R.
Aus dem Wandel des Marktes von der Produkt- zur Kundenorientierung und dem zunehmenden Einsatz von Qualitätssicherungssystemen ergeben sich auch für die zerstörungsfreie Prüfung entscheidende...
Zerstörungsfreie Ermittlung des Werkstoffzustandes (1993)
Materials properties depend upon the structure of materials. Several groups of properties can be correlated to typical structure dimensions. For example mechanical properties can be correlated to the...
Tasks of Non-Destructive Testing (1993)
New materials are developed for the purpose of enhancing and extending the serviceability, i.e. fitness for use, of industrial products. An essential aspect in this context is also more economically...
Surface characterization by high-resolution nondestructive methods (1993)
Kröning, M., Meyendorf, N., Netzelmann, U., Altpeter, I., Becker, R.
The formal similarities and physical differences between eddy current and thermal wave techniques are discussed. For metals, the ratio of the thermal diffusion length to the electromagnetic skin...
State of the art report about NDE-reactor safety research (1993)
Schmülling, W., Kappes, W., Kröning, M.
The aim of the reactor safety research is to provide the scientific and technological basis to evaluate the safety margins of nuclear power plants and their systems and further develop safety...
Results and experiences of ISI austenitic and dissimilar welds using SH-waves and EMUS-probes (1993)
Salzburger, H.J., Bernus, L. Von, Oellrich, K., Hübschen, G., Kröning, M.
Increasing demands for In-Service-Inspection (ISI) of austenitc and dissimilar metal welds in NPP's in Germany and other european countries from the motivation of the application of new...
Dobmann, G., Kröning, M., Kraus, S.
Die zerstörungsfreie Werkstoffprüfung unterlag im letzten Jahrzehnt einem Aufgabenwandel: Beauftragt mit und gewachsen an der gesetzlich geforderten und als gesellschaftspolitisch verstandenen...
Qualitätssicherung durch zerstörungsfreie Ermittlung des Werkstoffzustandes (1993)
High quality requests of products mean also the demand for constant material conditions fitting for the stress range. Therefore the quality assurance of semifinished and finished products is...
Kröning, M., Hübschen, G., Salzburger, H.J.
Among the different ultrsonic wave modes - Longitudinal (L-) waves, Shear waves with polarization in the plane of incidence (SV-waves), L-waves with a high beam angle of 70 (TRL 70) and SH-waves show...
Nondestructive evaluation of creep-induced material degradation in low alloy ferritic steels (1993)
Willems, H., Koble, T.D., Kröning, M.
Material degradation by ccreep limits the lifetime of components used in high temperature applications such as piping systems in fossil power plants. The degradation is due to microstrucural changes...
Dobmann, G., Kröning, M., Theiner, W., Willems, H.
In recent year, MDT-techniques for MATERIALS CHARACTERIZATION have been developed under the sponsorship of the German Minister of Research and Development in the Reactor Safety Research Programme in...
Eine neue Qualität bei der automatisierten Ultraschallprüfung (1993)
Kappes, W., Kröning, M., Schirra, M., Schmitz, V.
Non-destructive testing of safety relevant components by ultrasound, e.g. primary circuit components in nuclear power plants, is according to the state of the art performed by automated systems....
NDE of austenitic cladding by using low frequency eddy current and EMA-excited SH-Waves (1993)
Salzburger, H.J., Becker, R., Hübschen, G., Kröning, M.
The state of the art inspection the austenitic cladding is the EC-techniques for surface breaking cracks and UT for defects in the interface zone and the ferritic base material below it. A new...
Low frequency eddy current inspection of the tube cladding (1993)
Hübschen, G., Becker, R., Kröning, M.
The multifrequency eddy current technique with frequency components greater then 20kHz is the established method for the defect inspection of the nearsurface zone of austenitic cladded components. A...
Leistungsbewertung und Validierung von ZfP-Systemen - eine europäische Aufgabe (1993)
Engl, G., Kröning, M., Wüstenberg, H.
Über 17 Jahre hinweg wurde das große internationale Programm PISC zur Untersuchung der Leistungsfähigkeit der zerstörungsfreien Prüfung an Reaktorkomponenten durchgeführt. Dabei standen große...
Inspection procedure assessment using modelling capabilities (1993)
Kappes, W., Kröning, M., Schmitz, V.
Before carrying out inspections at technical components, criteria have to be met to qualify the inspection procedure. The inspection qualification can be performed by technical justification or...
Die vorgestellten Ergebnisse demonstrieren das hohe Potential des Wirbelstrom-, des Verschiebungsstrom- und des Mikrowellenverfahrens zur Detektion und Charakterisierung von Fehlern in...
Evaluation of thermally induced residual stresses in white cast iron and iron-carbon steel. (1993)
Altpeter, I., Kern, R., Kröning, M.
Technical materials in general have a microscopic heterogeneous structure, i.e. they contain two or more phases with different thermally induced residual stresses. The kownledge of residual micro and...
Steel-grading by micromagnetic techniques (1992)
Dobmann, G., Koble, T., Kröning, M.
In the present investigation attempts have been made to identify the steel grade in the nondestructive way using micromagnetic techniques (3MA: Micromagnetic-, Multiparameter-, Microstructure- and...
Schweißnahtprüfung mit Fernfeld-Wirbelstrom-Prüftechnik (1992)
A feasability study of the remote field eddy current technique has been performed investigating the inspection of circumferential sleeve tube welds in steam generator tubing. Exciting coil and...
Kröning, M., Neumann, R., Willems, H.
The ultrasonic backscattering technique is a powerful tool for the nondestructive dtermination of hardening depth of the heat affected zone which in many cases directly correponds to the hardening...
Kuhn, W., Dobmann, G., Köller, E., Kröning, M.
To optimize the system for solid state imaging applications different techniques were implimented. Beside the well known Fourier-Transform-Imaging-Algorithm with frequency and phase information, a...
Betzold, K., Kröning, M., Spies, M.
Das Potential der theoretisch-numerischen Modellierung von realen Prüfaufgaben sowie der Simulation von Prüfsignalen wird an drei ausgewählten Beispielen aus der zerstörungsfreien Prüfung mit...
Mastering quality by integration of nondestructive testing tools into quality assurance (1992)
Dobmann, G., Kröning, M., Theiner, W., Willems, H.
Commonly Nondestructive Inspection (NDI) and Evaluation (NDE) are understood as detection, classification and sizing of imperfictions(pore, inclusion, shrinkage cavities, cracks, etc.) in materials...
Kuhn, W., Dobmann, G., Köller, E., Kröning, M.
Wie die Entwicklungen in der Polymerphysik während der letzten Jahre zeigen, gehört die Magnetische Resonanz (Nuclear Magnetic Resonance - NMR), neben Neutronenverfahren zu den leistungsfähigsten...
High-resolution photothermal imaging of materials and components (1992)
Using photothermal measurements as a new NDE method opens an application field of increasing interest for the predictive maintenance of plants and components. As this high resolving method of...
Früherkennung von Kriechschäden - Zum Stand fortschrittlicher Zerstörungsfreier Prüfverfahren (1992)
Dobmann, G., Koble, T.D., Kröning, M., Willems, H.
The contribution refers results for the development and application of nondestructive testing techniques for the early detection of creep damage on the box of the development of creep cavitation,...
Bernus, L. Von, Mohr, F., Schmeidl, T., Ermert, H., Berger, M., Kröning, M., ...
In der zfP ist die Abbildungsgüte von Werkstoffehlern von großem Interess. Am Beispiel eines in einem dickwandigen Bauteil innenliegenden Risses wird gezeigt, daß unter Verwedung von a-priori...
Entwicklung der ZfP zur Wirtschaftlichkeit - Qualitätsbeherrschung statt Qualitätskontrolle (1992)
Dobmann, G., Kraus, S., Kröning, M.
Industrial production management is changed under the aspects of systems engineering into organization structures following interdisciplinary and integral strategies. This change causes the...
Till now, the evaluation of acoustic emission (AE) events to be based on empirical connections between the source parameters and the measured radiation pattern. To obtain quantitative information on...
Weiter-Entwicklungen und praktische Anwendungen der EMUS-Technik (1991)
Hübschen, G., Kröning, M., Salzburger, H.J.
Die elektromagnetische Ultraschall (EMUS)-Wandlung hat sich in den letzten Jahren als eine für viele praktische Anwendungen geeignete Technik erwiesen. Unterschiedliche Prüf- und Meßverfahren...
Qualifiziertes Prüfen - eine methodische Betrachtung der Intelligenz des Prüfens (1991)
Baumbach, H., Kröning, M., Perner, P.
Die zerstörungsfreie Prüfung von Materialien und Werkstücken besteht aus der zerstörungsfreien Bestimmung von physikalischen Meßgrößen und aus der Bewertung dieser Meßgrößen bezüglich der...
Mikro-zfP als neues Aufgabenfeld der ZfP (1991)
Zerstörungsfreie Prüfverfahren werden zunehmend in den Produktionsprozeß eingebunden, um möglichst fehlerfrei und daher kosteneffektiv herstellen zu können. Weiterhin werden in immer größerem...
Der Beitrag stellt das Methodenpotential der zerstörungsfreien Prüfung für die Integration in der Qualitätssicherung dar. Sowohl in den Entwicklungslabors der Industrie beim Design neuer...
Der Beitrag stellt das Methodenpotential der zerstörungsfreien Prüfung für die Integration in der Qualitätssicherung dar. Sowohl in den Entwicklungslabors in der Industrie beim Design neuer...
Entwicklungstendenzen bei zerstörungsfreien Prüfungen (1991)
Die Entwicklungstendenzen der zerstörungsfreien Prüfverfahren werden bestimmt durch den zunehmenden Wunsch, wirtschaftlich die Gebrauchseignung bzw. die Betriebssicherheit technischer Produkte und...
Die Aussagekraft der Ultraschallprüfung von austenitischen Schweißverbindungen an Rohrleitungen wird zum einen bestimmt durch die üblichen, auch in ferritischen Rohrschweißverbindungen...
Evaluation of ultrasonic volume- and underclad indications at long distances (1989)
Bernus, L. Von, Kröning, M., Gebhardt, W., Schmitz, V.
Analysis techniques are applied in UT examinations if the standard examination provides unacceptable indications and more exact parameters are required for the fracture mechanics evaluation. The...
Besonderheiten der Fehleranalyse bei großen Schallwegen und plattierungsnahen Befunden (1987)
Bernus, L.v., Kröning, M., Gebhardt, W., Schmitz, V.
Bei Fertigungs- und Wiederkehrenden US-Pruefungen werden Analysetechniken eingesetzt, wenn die Standardpruefung unzulaessige Befunde zeigt und fuer die bruchmechanische Beurteilung eine genauere...
Nachweis zur Leistungsfähigkeit der phasengesteuerten Gruppenstrahler ALOK-Prüftechnik (1986)
Bohn, H., Rathgeb, W., Barbian, O.A., Gebhardt, W., Kappes, W., Kröning, M.
Die Leistungsfaehigkeit der phasengesteuerten Gruppenstrahler/ALOK-Prueftechnik ergibt sich aus der Einfachheit des Pruefsystemaufbaus, der Reflektorkennung durch Laufzeitkurven und der...