Hydrocode and microstructural analysis of explosively formed penetrators

摘要

A comparison of residual microstructural features in tantalum, iron, and copper explosively-formed projectiles (EFP's) utilizing optical and transmission electron microscopy (TEM) was undertaken and these observations correlated with corresponding microhardness maps measured on the recovered EFP half sections. These microstructural comparisons and residual microhardness maps were then used to validate AUTODYN-2D hydrocode simulations of residual yield stress profiles and the geometrical parameters measured from the recovered EFP's. Both Johnson-Cook and Zerilli-Armstrong constitutive relations were applied and compared in these simulations which also examined the initiation parameters on EFP evolution. Calculated plastic strain and temperature contour plots were also correlated with observed microstructures and the microhardness maps. (C) Kluwer Academic Publishers. [References: 43]