Evaluating the Impact Resistance of Double-layered Aluminum Alloy Plates with Diverse Shapes against Blunt Rigid Projectiles

Abstract

Abstract Scholars have studied the impact resistance of flat plates quite well. However, in practical applications, the connecting part of the protective end often presents other shapes, and the importance of this part for the protective effect should not be neglected. Therefore, it is valuable to conduct further research on the shape of target plates. This study aims to investigate the impact resistance of combined target plates of 1100 and 7075 aluminum alloys with different shapes. In this study, the failure modes of double-layered aluminum alloy plates under the impact of blunt projectiles were analyzed by changing the order of plate arrangement and the shape of projectiles, and the ballistic limits and energy absorption characteristics were determined. In addition, a 3D finite element model was established using ABAQUS/Explicit software, and after verifying its accuracy, the model of flat nosed projectile impacting other shapes of double-layered target plates was extended using the finite element method. The results show that for plane plates, arched plates and L-square plates, the sequential arrangement of ductile high metal in the front plate and strong high metal in the back plate possesses better ballistic resistance. However, for hemispherical shells, the same arrangement results in weaker impact resistance. Finally, the paper concludes that the shape of the protective ends affects the order of arrangement for optimum impact resistance.