675装甲钢的静动态力学行为与J-C模型参数拟合确定

Static and Dynamic Mechanical Properties of 675 Armor Steel and Determination of J-C Model Parameters

为研究675高强装甲钢在受到弹丸冲击后的动态响应问题,需要确定一套适用于侵彻仿真计算的675装甲钢的材料模型.通过开展675装甲钢的动静态力学性能试验和材料断裂实验,并且根据实验结果对675装甲钢材料的Johnson-Cook本构模型和失效模型参数进行了拟合.同时,根据弹道试验建立了仿真侵彻模型,将数值计算结果与试验结果进行了对比。结果表明:通过材料性能实验得到的675装甲钢的Johnson-Cook本构和失效模型应用于弹靶侵彻的数值仿真时,得到的仿真结果与弹道试验结果的平均误差为6.5%,最大误差不超过10%,拟合得到的Johnson-Cook本构模型和失效模型参数的可靠性较高,对675装甲钢在冲击载荷下的仿真计算具有重要意义.

In order to study the dynamic response of 675 high strength armor steel after impact by projectile,it is necessary to determine a set of material model of 675 armor steel suiTab.for penetration simulation calculation.Therefore,the dynamic and static mechanical properties test and material fracture test of 675 armor steel were carried out,and the Johnson-cook constitutive model and failure model parameters of 675 armor steel were fitted according to the experimental results.At the same time,the penetration simulation model was established according to the ballistic test,and the numerical results were compared with the test results.The results show that:when the Johnson-cook constitutive model and failure model of 675 armor steel obtained from material performance experiment are applied to the numerical simulation,the average error between the simulation results and ballistic test results is 6.5%,and the maximum error is less than 10%.The parameters of Johnson-cook constitutive model and failure model are reliable,it is of great significance to the simulation of 675 armor steel under impact load.