Static Cavity Expansion Model for Partially Confined Targets.
TEXAS UNIV AT AUSTIN INST FOR ADVANCED TECHNOLOGY
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The cavity expansion model CEM, originally proposed as an indentation theory, has been used extensively to estimate the resistance of targets to long rod penetration. In the classical model the target is infinite and the cavity is opened up from zero radius. In previous work we applied the classical approach to laterally finite targets and we ran into difficulty. The resistance came out as decreasing with cavity radius. To circumvent the difficulty we introduced an averaging scheme with a free parameter to be determined from computer simulations. In this work we use a different approach, we open up the cavity from a finite radius. We first propose the concept that the target penetration resistance is the limit of stability of the cavity. We then apply this concept to estimate the resistance of partially confined targets. We do this for both cylindrical and spherical cavities. Comparing the model solutions to computer simulation results reported in, we find good agreement for the spherical CEM, but not for the cylindrical CEM.