平头弹冲塞靶板的绝热剪切数值模拟

Numerical simulation of adiabatic shear in blunt nose projectile plugging target

针对绝热剪切形成时由于变形高度局域化,塑性功产生的热导致局部高温,有时会伴随动态再结晶(DRX)的现象,采用一种考虑动态再结晶过程的绝热剪切破坏准则,利用有限元方法模拟了Arne工具钢平头弹冲塞Weldox 460E钢靶板的实验。数值模拟揭示了剪切带产生、传播的过程,温度分布情况表明在绝热剪切带中具备动态再结晶形成的物理条件。

Experiments have shown that during the formation of adiabatic shear,because of highly localized deformation,the heat generated by plastic work causes localized high temperatures,and sometimes the process may be accompanied by the phenomenon of dynamic re-crystallization.Based on this phenomenon,numerical simulations are performed to simulate a Arne tool-steel blunt nose projectile plugging a Weldox 460 thin target,using the finite element method.The adiabatic shear failure criterion is based on the hypothesis that material inside the shear band region undergoes a dynamic re-crystallization process.Numerical simulation reveals the adiabatic shear generation and propagation process.The temperature distribution shows that the adiabatic shear bands can provide physical conditions for a dynamic recrystallization process.