超高分子量聚乙烯纤维增强层合厚板抗高速钝头弹侵彻的理论模型

Theoretical model for thick ultra-high molecular weight polyethylene fiber reinforced laminates penetrated by high-velocity blunt-nosed projectiles

结合超高分子量聚乙烯纤维增强塑料(UFRP)层合厚板抗高速侵彻的特点,将整个侵彻过程分为开坑镦粗、剪切压缩和拉伸变形3个阶段。通过改进开坑镦粗阶段的计算方法和拉伸变形阶段的计算过程,基于能量守恒原理建立UFRP层合厚板抗高速钝头弹侵彻的弹体侵彻深度和靶板弹道极限的计算模型,并给出相应的计算流程图。通过采用该模型计算相关文献试验工况下的弹体侵彻深度和层合厚板弹道极限,发现计算值与文献试验结果均吻合较好。改进后的模型考虑了弹丸初速度对开坑镦粗阶段侵彻深度的影响,能够对高速钝头弹侵彻UFRP层合厚板的弹体侵彻深度和层合厚板的弹道极限进行合理的预测,并可降低试验成本。

Due to the high penetration-resistance of thick ultra-high molecular weight polyethylene fiberreinforced plastic（UFRP）laminates under high velocities,the whole penetration process is divided intothree phases：cratering mushrooming phase,shearing compression phase,and stretching deformationphase. By altering the computation method for the cratering mush rooming phase and the calculation pro-cess for the stretching deformation phase,an analytical model is established based on the energy conserva-tion principle to compute the penetration depth of projectiles as well as the ballistic limits of laminates inthe case of thick UFRP laminates being penetrated by high-velocity blunt-nosed projectiles. The corre-sponding computation flow charts are also presented. Moreover,penetration depths of projectiles and ballis-tic limits of thick laminates under different test conditions are calculated with the model in a correlative or-der. It is seen that good agreements are obtained between the theoretically values and experimental results.Therefore,the improved model,which considers the projectile initial velocity effects on penetration depthduring the cratering mushrooming phase,can be employed to reasonably predict the penetration depthsand can reduce experimental costs,demonstrating both theoretical and engineering values.