One-dimensional approximate technique for earth penetration calculations
The penetration process is approximated by the one-dimensional expansion of a cylindrical cavity in an infinite solid. Linear and quadratic forms are used to describe, piecewise, the volumetric response of the target during loading at the shock front. It is assumed that the density locks at the shocked state. The shear strength of the target is taken to be a piecewise linear function of pressure. However, it is assumed that the target material is weak in shear and, thus, that the effect of shear strength can be treated as a perturbation on the hydrodynamic solution. For conical-nosed penetrators an analytic expression for the normal stress results from the analysis, while for ogival-nosed penetrators the solution must be obtained numerically. A computer program, PENAP, was written to treat both the ogive and cone geometry, and PENAP solutions were found to agree well with both experimental data and TOODY, two-dimensional finite-difference wavecode results. It should also be noted that the PENAP calculations typically required several orders of magnitude less computer time than did the TOODY calculations.
- Research Organization:
- Sandia Labs., Albuquerque, N.Mex. (USA)
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 5359900
- Report Number(s):
- SAND-77-1126
- Country of Publication:
- United States
- Language:
- English
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