| Non-Linear Elastic Behaviour of the Roller Bearing Steel SAE 52100 During Cyclic Loading. (1998) | |||||||||
Abstract | |||||||||
| The hardened roller bearing steel SAE 52100 (100Cr6) exhibits unusual sickle-shaped hysteresis loops when subjected to uniaxial symmetrical push-pull tests; this observation can be attributed to the fact that the elastic modulus is stress-dependent as a consequence of non-linear elastic effects; elastic unloading experiments performed in tension and in compression during a cycle permitted the stress dependence of the elastic modulus to be determined quantitatively; by a quadratic extension of Hooke's law in accord with an anharmonic lattice potential the experimental observations can be described in good approximation; using this concept, the originally bent hysteresis loops can be converted into hysteresis loops of the normal shape in the representation of plastic strain vs. stress; a comparison of the results with measurements on alpha-iron whiskers reported in the literature indicated that the departures from linear elasticity observed in high-strength steels are in the same order of magnitude as in the case of pure iron. | |||||||||
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