Mechanism of high-velocity blunt-nosed projectiles penetrating moderately thick UHMWPE fiber reinforced plastic laminate
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摘要: 根据侵彻过程中的不同受力状态和耗能机制,结合高强聚乙烯纤维增强塑料(UFRP)层合板抗高速侵彻特点,将高速钝头弹对中厚UFRP的侵彻过程分为压缩镦粗、剪切压缩和拉伸变形三个阶段。基于三阶段侵彻机制,利用能量守恒原理建立了钝头弹高速侵彻中厚UFRP的弹道极限和剩余速度计算模型。采用侵彻模型计算了相关文献弹道试验工况下弹体的剩余速度和弹道极限速度,计算值与文献试验值吻合较好。三阶段侵彻模型考虑了试验中出现的纤维熔断和弹体镦粗现象,能够对高速钝头弹侵彻中厚UFRP的剩余速度和弹道极限速度进行合理预测,具有一定的理论价值和工程应用价值。Abstract: According to different mechanical states and energy-dissipative mechanisms during penetration process, together with the high-velocity penetration-resistant characteristic of ultra-high molecular weight polyethylene fiber reinforced plastics (UFRP), the whole process of high-velocity blunt-nosed projectiles penetrating moderately thick UFRP is divided into three consecutive phases, i.e., compression & mushrooming phase, shearing & compression phase and stretching deformation phase. Based on three-phase penetration mechanism, an analytical model was developed to compute ballistic limits and residual velocities of projectiles penetrating moderately thick UFRP. Ballistic limits and residual velocities of projectiles for different test cases in a correlative reference were calculated by the model. Good agreements are obtained between the calculated values and experimental results. The three-phase penetration model, which considers the phenomenons of melted fibers due to frictions and mushrooming of projectiles existing in ballistic tests, can be employed to reasonably predict ballistic limits and residual velocities of high-velocity blunt-nosed projectiles penetrating moderately thick UFRP. The model has theoretical and engineering application values.
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