| Investigation of the Computer Modeling of the Direct Coupling of High Explosive Energy to the Ground for Surface Tangent--Above TNT Spheres (100-500 Tons). (2002) | |||||||||
Abstract | |||||||||
| The calculational modeling of the initial coupling of impulse and energy to the ground for large yield (100-500 tons) surface tangent-above spherical TNT cratering calculations was investigated. A pressure-time surface boundary condition was found to be an accurate way of modeling this initial coupling, if the styrofoam/plywood structure supporting the TNT charge is neglected. The specific boundary conditions used in its current baseline Middle Gust III calculation was examined, and compared favorably with ones previously used. No cratering calculations were found which adequately modeled the TNT charge support structure. One-dimensional calculations were performed to assess its effect on the initial coupling. Results showed that inclusion of a reasonable model for the support structure in a two-dimensional cratering calculation would cause higher close-in peak pressures in the soil, while probably not changing the total directly coupled energy or impulse significantly. Two-dimensional effects would predominate in such a calculation, however, and these were not addressed in the present investigation. | |||||||||
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