A 2-DIMENSIONAL ANALYSIS OF PENETRATION BY AN ERODING PROJECTILE

A full two-dimensional solution is obtained for the problem of high ve locity penetration by an eroding long rod projectile into a thick targ et. The present analysis is based on the methods of dynamic plasticity in contrast to the 1-D treatments of Alekseevskii [Combustion, Explos ion and Shock Waves, Vol. 2 (1966)] and of Tate [J. Mech. Phys. Solids 15, 287-399 (1967) and 17, 141-150 (1969)] using the modified hydrody namics approach. The formulation considers fully developed plastic flo w fields in the penetrator and in the target. A variational theorem is used to constrain the geometry of each of those flow fields for minim um dissipation conditions The analysis requires satisfaction of the go verning equations of motion and overall force balance at the target/pr ojectile interface. Comparisons of the present 2-D formulation with te st data indicate very good agreement.