高强聚乙烯层合板抗破片模拟弹侵彻性能数值分析

Ballistic performance of ultra-high molecular weight polyethylene laminates against fragment-simulating projectiles

[目的]旨在探究破片侵彻作用下高强聚乙烯(UHMWPE)纤维增强层合板的毁伤响应过程、失效模式转变和能量吸收特性。[方法]采用有限元软件ANSYS/AUTODYN,建立UHMWPE层合板抗破片侵彻数值模型,分析UHMWPE层合板的失效模式转变和能量吸收特性。[结果]破片侵彻作用下UHMWPE层合板的动态响应过程大致可以分为剪切冲塞阶段和拉伸变形阶段。破片入射速度和靶板厚度会直接影响靶板的能量吸收特性。靶板厚度越大,剪切冲塞模式占比越大。在靶板厚度不变的情况下,随着破片侵彻速度的提高,剪切冲塞模式占比越来越大,最终趋于稳定。在破片弹道极限速度以上初始小范围内,靶板吸能随破片入射速度增大有所减小,随后破片速度继续增加会扩大靶板剪切冲塞破坏范围,导致靶板整体吸能量增加。[结论]基于所建立的数值模型能够较好地模拟破片侵彻作用下UHMWPE层合板的动态响应过程,可以为UHMWPE材料在弹道防护领域的应用提供参考。

[Objectives]This paper aims to study the dynamic perforation response process,failure mode transition and energy absorbtion characteristics of ultra-high molecular weight polyethylene(UHMWPE)laminates against fragment-simulating projectiles(FSPs).[Methods]FE software ANSYS/AUTODYN is employed to establish a numerical model for fragment penetration resistance of UHMWPE laminates,and analyze the failure mode transition and energy absorbtion characteristics of the target plates.[Results]The process can be roughly divided into two stages:the shear plugging stage and stretch deformation stage.The thicker the target plate,the greater the proportion of the shear plugging mode.When the thickness of the target plate is constant,with the increase in fragment penetration velocity,the proportion of the shear plugging mode becomes larger until it reaches a stable level.In the initial small range above the ballistic limit velocity,the energy absorbtion of the target plate is negatively related to the velocity of the projectiles.As the fragment velocity increases,the shear plugging range of the fiber fracturing enlarges,and the energy absorbtion of the targets increases with the velocity of the projectiles.[Conclusions]Based on the proposed numerical model,the dynamic response process of UHMWPE laminates against FSPs can be simulated accurately,which can provide references for the application of UHMWPE laminate plates in the ballistic protection field.