Computational Model for Armor Penetration
Annual rept. no. 2, Oct 1979-Oct 1980
SRI INTERNATIONAL MENLO PARK CA
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Results are reported from the second year of a three-year BRLAMMRC SRI program to develop a computational capability for predicting the behind-the- armor fragment environment for spaced armor attacked by long-rod penetrators. The baseline materials chosen were rolled homogenous steel armor RHA and depleted uranium DU for the penetrator. Phenomenological studies involving both quarter and full-scale ballistics tests at velocities up to 1.5 kms and obliquities from 0 to 70 clearly revealed shear banding to be the principal phenomenon controlling both penetrator erosion and armor failure. A detailed, phenomenological scenario for oblique armor penetration is given . Contained fragmenting cylinder CFC experiments were performed to characterize the resistance of RHA to shear banding a significant anisotropy was observed. The SHEAR3 computational model for shear banding was refined and calibrated with respect to previously obtained data from CFC experiments using 4340 steel Rc40 .