High-Obliquity Impact of a Compact Penetrator on a Thin Plate: PenetratorSplitting and Adiabatic Shear

摘要

Computational simulations were performed of the impact of a compact, nonidealpenetrator on a thin plate at high obliquities. These computations simulated two series of experiments at velocities of 1.5 km/s and 2.2 km/s, respectively, with obliquities of 55-70 deg. The experimental results indicated penetrator splitting at obliquities between 55 and 650. Preliminary three-dimensional simulations with the CTH code, using either maximum tensile stress failure or the Johnson-Cook model, captured some aspects of fragment splitting but in a less than satisfactory manner. Simulations utilizing the Silling shear band model were also performed, with somewhat more realistic results. In addition to graphical descriptions of the target hole geometry and debris cloud, numerical histories of the target hole area and up-range/down-range partitioning of mass, momentum, and energy were extracted for comparison with the experiments.