残余应力对装甲钢板抗弹性能影响的有限元模拟

Finite Element Simulation of Influence of Residual Stress on Anti-ballistic Performance of Armor Steel Plate

建立了普通钢芯子弹射击4.6 mm厚装甲钢靶板有限元模型,将试验测得的沿板厚方向分布的残余应力赋值于有限元模型,研究了靶板初始残余应力对其抗弹性能的影响,并用试验结果对模拟结果进行了验证。结果表明:有初始残余应力靶板背凸高度和弹坑深度的模拟结果与试验结果相符,相对误差分别仅为2.0%和4.8%,证明模型准确;与无初始残余应力靶板相比,施加初始残余压应力后靶板的背凸高度和弹坑深度均减小,说明其抗弹性能提高;随着施加残余压应力的增大,靶板抗弹性能呈现出略微提升的趋势,但提升幅度很小。

A finite element model of 4.6 mm thick armor steel target plate shot by ordinary steel core bullet was established,and the residual stresses distributed along the plate thickness direction,which were measured by experiments,were assigned to the finite element model.The influence of the initial residual stress of the target plate on its anti-ballistic performance was studied,and the simulation results were verified by the test results.The results show that the simulation results of the back bulge height and crater depth of the target plate with initial residual stresses were consistent with the test results,and the relative errors were only 2.0%and 4.8%,respectively,indicating that the model was accurate.Comparing with those without initial residual stresses,the back bulge height and crater depth of the target plate with the initial residual compressive stress were reduced,indicating the antiballistic performance of the steel plate was improved.With the increase of applied residual compressive stresses,the anti-ballistic performance of the target plate showed a slight increase trend,but the increase was very small.