钢芯弹冲击高强度钢过程的数值模拟分析

 通过材料特性实验获得7.62 mm×39 mm普通钢芯弹弹芯、N-1高强度钢靶板材料的力学本构模型参数，建立了弹体和靶板的精细有限元模型。对靶板钢材的J-C断裂准则进行改进，并在LS-DYNA软件中实现。应用改进的断裂准则进行了N-1钢受普通钢芯弹垂直冲击过程的数值模拟，计算结果可更准确地反映出实验中靶板出现的绝热剪切冲塞行为，冲塞尺寸较接近实验结果，弹道极限速度也与实验吻合。由此克服了基于原J-C断裂准则计算的缺陷——靶板发生与实验结果不符的拉伸型破坏、冲塞尺寸明显偏小。

Perforation Simulations of High-Strength Steel by Steel Core Bullets

Material experiments were performed to identify dynamic constitutive model parameters for steel core of 7.62 mm×39 mm bullets and N-1 high-strength steel.Highly detailed FE model of the projectile and steel target plate was built up.The J-C fracture rule for the target plate was modified and implemented with LS-DYNA.The process of N-1 steel being impacted by steel core projectile was simulated with the modified fracture rule.Adiabatic shear behavior and the size of plug from the target plate are predicted accurately.Ballistic limit velocity simulation agrees well with experimental result.In this way,the unreasonable tensile failure within steel target and the underestimation of plug size predicted based on original J-C fracture rule are overcome.