Effect of Gradient Layer Thickness on Anti-penetration Properties of 2024 Al/TC4 Laminated Composites

Abstract:

A gradient structure was introduced into a metal laminated target plate, and the anti-penetration simulation of the gradient structure was compared with that of a uniform-layer-thickness target plate by finite element simulation. The analysis was verified by an impact experiment. Results show that the high-level thickness and appropriate percentage of Ti alloy at the upper side of the gradient structure provide greater impact resistance against the bullet, which increases the warhead breakage and enhances the anti-penetration performance. In addition, during the impact process, the stress is transmitted and reflected in the form of waves in each layer of the target plate, and the interaction between the compression and tension waves causes non-synergistic deformation of the target plate and leads to delamination. The gradient target plate takes penetration resistance a step further through the higher energy absorption rate and more consumption of the bullet kinetic energy. This research provides a theoretical basis for the application of gradient structures in metallic laminated armor.