Analysis model of double-layer targets of projectile penetration into concrete/rock considering interface effects

In this study, projectile penetration into a concrete/rock double-layer target is studied experimentally. The influence of interfacial reflected and transmitted waves on the perforation performance of double-layer targets is studied using the one-dimensional stress wave propagation theory. The perforation mechanism of double-layer targets is obtained by combining the principles of energy conservation and minimum potential energy. Based on these, a theoretical model is established to analyze the penetration behavior of the double-layered target subjected to rigid projectile loading. The established model is verified using the experimental data obtained from this study and other published literature. The results show that the prediction results of the present model are consistent with the experimental data at different initial penetration velocities. A comparative analysis of the present model with several previous penetration prediction models reveals its substantial advantages in terms of accuracy and applicability. The model can effectively predict the penetration performance of concrete/rock double-layer targets under different penetration velocities.