Anti-explosion and shock resistance performance of sandwich defensive structure with star-shaped auxetic material core

Abstract

A sandwich defensive structure made up of the star-shaped auxetic cellular material is designed in this paper. FE models are developed to simulate the process of projectile penetration and underwater explosion. Different structure parameters, such as cell thickness and Poisson’s ratio of the star-shaped material, are applied to investigate the affections of the auxetic insert layer in projectile penetration and explosion. According to the numerical simulation results, the star-shaped auxetic sandwich structure does not strong enough to defense missile attacks as it bringing higher residual velocity compared with the traditional monolithic shield. Meanwhile, this auxetic structure tends to show better anti-explosive performance than the traditional shield of equal mass. Structure parameters of the star-shaped material influence the anti-explosion ability of sandwich structure in different complicated ways. As far as simulated cases, the sandwich structure can achieve the best anti-explosion performance by setting the value 1.63 for Poisson’s ratio of auxetic cellular and decreasing the layers of the cellular material.