炸药切削数值模拟研究

Numerical Simulation of Explosive Machining

采用LS-DYNA显式非线性动力分析程序,针对HMX基PBX炸药材料的切削加工进行了切削数值模拟及相关模型的研究,完成了不同切削参数下切削力的数值计算,与实验测量结果吻合较好。研究表明,在切削宽度远大于切削层厚度的条件下,采用平面应变切削模型进行炸药切削数值模拟是可行的,等效应力失效准则适合于描述炸药切屑的断裂和分离。切削力的计算结果显示,切削力随切深和进给量的增大而增大,切削速度对切削力的影响不明显,其中,切深对切削力的影响最为显著。

Numerical simulation and related models for HMX based PBX explosive machining were performed and studied by using LS-DYNA. Tool forces with various cutting parameters were computed for HMX based PBX explosive, and the calculational results agree well with the experimental results. Results show that the plane strain model is reliable for simulation of explosive machining when cutting width is far greater than cutting layer thickness. Effective stress failure criterion is appropriate for simulating chip sepa- ration of explosive. The tool force increases with increasing of depth of cut and feed rate, and cutting speed has no obvious effect on tool force. Depth of cut affects tool force most greatly among the three parameters.