Abstract
The general purpose of this investigation is to determine the dynamic behavior of metallic materials (particularly, influence on the yield stress) through the study of the deformation of a projectile during the process of penetration. The method of approach known as direct analysis has been used. This method bypasses differential equations and instead directly uses the physical laws of the process. This paper is divided into two parts. In the firstjof these, we assume rigid, perfectly plastic behavior at a specified yield stress. In the second part, the analysis is extended to take into account more general material behavior. Itfincludes the effect of elasticity and various combinations of work-hardening. Two groups of comparison studies were made, first with the results of A. C. Whiffin and G. I. Taylor, and then with some recent data of Ballistic Research Laboratory (BRL) projectiles. It has been found that this analysis can give very satisfactory agreement with the actual profiles (for mild steel) if we assume a rigid work-hardening behavior.
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