Unique Aspects of Micromechanics in Ballistic Penetration
Final rept. Mar-Aug 96
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Ballistic experiments with tungsten penetrators composed of single crystals have been used to specify and constrain deformation modes in order to elucidate the role of flow and deformation mechanisms in penetration. The large differences in penetrator performance as a function of crystal symmetry are interpreted in terms of the structures observed and the basic deformation modes implied. The results suggest in very general terms the interactive role a material deformation parameters. The superior performance of the 001 orientation is attributed to the combination a yield strength with an unusually smooth lamellar flow after failure initiates. In contrast, the high yield strength of th 111 crystal is offset by the dissipation of energy in less efficient flow mechanisms and microstructural evolution. This analysis has implications for approaches to optimizing penetrator design through tailored materials and microstructures.