星型负泊松比超材料防护结构抗爆抗冲击性能研究

采用数值方法对星型宏观负泊松比效应夹芯结构的抗冲击响应过程以及抗水下爆炸过程中的破坏形式进行了研究:探讨了星型负泊松比结构胞元壁厚、层数和胞元泊松比等参数对弹体侵彻及水下爆炸防护性能的影响。研究结果表明:对于高速或超高速弹体侵彻问题,单纯依靠结构性的被动防御无法应对;负泊松比效应蜂窝夹芯防护结构相较常规防护结构具有良好的水下抗爆性能;等质量条件下,泊松比的变化对抗爆性能影响明显,层数3 层、泊松比为-1.63 的星型夹芯结构的抗爆性能相对更优;等壁厚条件下,其水下抗爆性能随蜂窝胞元层数减小而增强。

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

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.