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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。
According to the different state of force and energy dissipation mechanism during penetration process, combined with the characteristics of high-speed polyethylene fiber reinforced plastic (UFRP) laminates resistant to high-speed penetration, the penetration process of high-speed blunt bombs on the thick UFRP is divided into compression upsetting Coarse, shear compression and tensile deformation of three stages. Based on the three-stage penetration mechanism, the ballistic limit and residual velocity calculation model of the blunt-end projectile penetrating medium-thickness UFRP was established by using the principle of energy conservation. Using the penetration model, the residual velocity of the projectile and the limit velocity of the ballistic trajectory under the ballistic test condition are calculated. The calculated values are in good agreement with the experimental data. The three-phase penetration model takes into account the phenomenon of fiber fusion and projectile upsetting in the experiment, and can reasonably predict the residual velocity and the ballistic limit velocity of the penetration of the medium-speed UFRP with high-speed blunt projectile, which has certain theoretical value and engineering application value.