一种长杆弹超高速贯穿陶瓷/金属复合靶板的简化模型

摘要

基于合理简化假设建立快捷实用的工程分析模型是研究复合靶板抗弹体冲击能力的重要方法.已有弹体冲击陶瓷/金属复合靶板理论模型的形式及计算过程复杂,并且缺少弹体超高速(弹体初速大于1500 m/s)贯穿复合靶板的实验验证.综合考虑弹体侵彻破碎陶瓷锥体过程中破碎陶瓷强度的下降、弹体初速对破碎陶瓷锥半锥角取值的影响,以及金属背板挠曲变形对弹体侵彻破碎陶瓷锥的影响,基于半流体动力学Alekseevskii-Tate(A-T)模型建立了预测弹体超高速贯穿陶瓷/金属复合靶板残余速度的简化分析模型.通过与实验数据以及基于LS-DYNA有限元分析软件开展的钨合金长杆弹(初速1800~2600 m/s)贯穿Al2 O 3陶瓷/RHA钢复合靶板数值模拟结果对比,验证了简化分析模型、数值模型及其相应参数的正确性和适用性.进一步基于简化模型,在总厚度或总面密度一定的条件下,讨论了4种陶瓷面板(Al2 O3、AlN、SiC、B4 C)和两种金属背板(RHA钢、铝)复合靶板的弹道性能.%A quick and practical engineering analysis model based on the reasonably simplified hypothesis is an important means to study the ballistic performance of the ceramic/metal targets.The available detailed theoretical models have to carry out complex calculation and rarely are made comparisons with the residual velocity of the projectile perforating ceramic/metal targets under the condition of ultra-high speed (with the projectile muzzle velocity greater than 1500 m/s).In this study,considering the decrease of the strength of fractured ceramic during the penetration of the projectile into fractured conical ceramic,the effect of the projectile's initial velocity on the value of the half conical angle,and the influence of the metal plate's deflection on the long rod of ultra-high speed penetrating the fractured conical ceramic,based on the semi-fluid dynamics Alekseevskii-Tate (A-T) model,a simplified model predicting the residual velocity of the long rod of ultra-high speed perforating ceramic/metal target was proposed.By comparing with the experiment data and the simu-lation results of the tungsten long rod (1800-2600 m/s)perforating Al2 O 3/RHA steel target carried out on the LS-DYNA finite element analysis software,the correctness and applicability of the proposed simplified model,the numerical model and its corresponding parameters were validated.Furthermore, based on the simplified model,the ballistic performance of composite targets consisting of 4 ceramic facing plates (Al2 O3 ,AlN,SiC,B4 C)and 2 metallic backing plates (RHA steel,aluminum),under the condition of certain thickness and certain areal density was discussed.