Damage evaluation of two-layer targets impacted by a projectile

Damage assessment of two layer targets struck by a taper-nosed projectile is investigated in this paper. The proposed method in predicting failure behavior during the penetration process is based on the energy density damage theory. The targets are modeled as elastic/plastic materials which were used as the base materials at the beginning of penetration process. After the target is damaged, the behavior of material elements in the target varies from one location to another depending on local strain rates. The complete time history of damage until the targets were completely fractured has been obtained and provided in graphic form. The failure patterns presented in this study are similar to the observations from experimental works. This establishes the validity of applying the energy density damage theory to predict the failure behavior for this class of penetration problems.