Multi-parameter impact response analysis of composite target plates considering the influence of strain rate effect

This study systematically investigates the dynamic response of a hybrid composite target subjected to perforation by a cylindrical projectile, using a numerical model that incorporates both the strain-rate dependence of the composite and interlaminar cohesive elements. The results indicate a ballistic limit velocity of 180.45 m/s for the target. When the impact velocity exceeds this threshold, the residual velocity of the projectile increases nonlinearly with the impact velocity, whil e the energy absorption efficiency of the target plate gradually saturates. High-velocity impacts markedly accelerate damage propagation, leading to an expanded delamination zone on the rear side and the formation of more pronounced tear-type cracks. Within an impact angle range of 0° to 30°, the residual velocity decreases as the angle increases. However, between 30° and 45°, the residual velocity exhibits a rebound trend due to enhanced projectile gliding. This behavior is attributed to an asymmetric failure mechanism triggered by downward shift of contact point. Specifically, as the impact angle increases, the damage center deviates from central region of target, resulting in aggravated unilateral delamination and reduced energy absorption efficiency. The study reveals coupled effects of impact velocity and angle on failure mechanisms of composite targets, providing a theoretical basis for design and optimization of impact-resistant structures.