应力状态在球形弹丸撞击6061－T6铝薄靶弹道行为数值预报的作用

摘要

针对部分金属材料延性断裂、应力三轴度及Lode参数同时相关问题，将两个含Lode参数影响的断裂准则写入有限元程序ABAQUS，用于1．6 mm厚6061－T6铝合金靶板在7．9 mm直径球形弹丸撞击下断裂行为及弹道极限数值预报。为揭示应力状态影响，用两种不考虑Lode参数影响的断裂准则进行有限元计算，并与试验对比。结果表明，引入Lode参数可提升6061－T6铝合金靶板断裂行为及抗侵彻性能的数值预报效果。%Recentstudiesshowthattheductilefractureofsomemetalsmaydependonnotonlythestresstriaxiality but also the Lode parameter.Two ductile fracture criteria developed in recent publications incorporating the Lode parameter effect were implemented into ABAQUS procedure and were employed in the numerical prediction of the fracture behavior and ballistic resistance of 1 .6 mm thick 606 1-T6 aluminum alloy targets under impacts of a 7 .9 mm diameter steel ball.To reveal the effect of stress state,FE calculations by using other two fracture criteria without incorporation with the Lode parameter were conducted.These predictions were compared with the test results reported in the open literature. The present comparison study shows that the incorporation of the Lode parameter can improve the prediction results on the fracture behavior and ballistic resistance of 606 1-T6 aluminum alloy targets.