仿真预测泡沫铝弹道极限和弹丸侵彻冲击力
周冰;李良春;宋桂飞
【期刊名称】《兵工自动化》 【年(卷),期】2018(037)006
【摘要】为考察泡沫铝在弹道冲击下的临界破坏,应用数值仿真方法分析预测平头弹侵彻泡沫铝的弹道极限速度以及弹丸冲击力大小.泡沫铝采用 LS-DYNA的 Mat26模型,输入参数基于材料力学测试,解算过程应用抑制\负体积\算法.对于研究设定的泡沫铝,其弹道极限速度为 59.7 m/s.研究结果表明:在侵彻初始阶段,平头弹冲击力最大;中后段冲击力均匀变小.侵彻初始泡沫铝破坏以压剪为主;侵彻后段当冲塞体被压实到一定程度,破坏以拉伸断裂为主.该研究有助于优化试验设计和理论分析.%Numerical simulating methodology is developed to predict the ballistic limit and impact force in order to investigate the critical failure of aluminum foam under the penetrating by blunt-nosed projectile. Mat26 in LS-DYNA was selected as the constitutive model for aluminum foam modeling on the basis of mechanical tests. Moreover, two control algorithms being executed in LS-DYNA helped in preventing the negative volume error. For the implementing aluminum foam, the ballistic limit velocity was obtained as 59.7 m/s. The research results show that impact force of blunt-nosed projectile acted with the maximum magnitude in the initial stage, but uniformly decreased at the plugging stage. The failure of aluminum foam majored with a compress-shear pattern when the penetration commenced. Until the
仿真预测泡沫铝弹道极限和弹丸侵彻冲击力
