20CrMo材料本构模型及其有限元模拟

Constitutive model and finite element simulation of 20CrMo material

基于Johnson-Cook材料热-黏塑性本构模型,通过准静态压缩力学实验确定20CrMo材料的本构模型应变强化项系数;通过正交切削实验并运用Oxley-Welsh切削理论分析确定模型的应变速率和热软化效应系数,由此建立20CrMo材料的热-黏塑性本构模型。在此基础上,以剪切失效为切屑分离准则,仿真分析正交切削条件下的切削温度及切削力。对比仿真结果与切削实验测试结果可知:最大相对误差在20%以内,说明仿真分析较精确,也说明了建立的20CrMo本构模型有较高的准确性。

A Johnson-Cook thermo-viscoplastic constitutive model for 20CrMo material was established.The strainhardening parameters for the model were obtained on the base of data from quasi static compression force test.And using the Oxley-Welsh cutting theory,the strain rate parameters and thermal softening effect parameters for the model were determined by the analysis of the results from orthogonal cutting experiments.Under the condition of the JC model established and shear failure criterion,the results of cutting temperature and force gotten from orthogonal cutting wereanalyzed by finite elements simulation.By comparison between simulation results and experimental data.The results show that the maximum relative error is within 20%.The simulation analysis and the constitutive model are reasonable.