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使用准静态压缩实验和切削实验相结合的方法,拟合出2Cr13材料的Johnson-Cook模型。在低应变率范围内采用压缩实验的方法来获得材料模型的系数,使用切削实验来获得高应变率条件下的材料系数。由于压缩实验所能获得的最大应变率仍然比切削实验中所能达到的最低应变率低几个数量级,因此实验采用应变外推的方法来获得符合Johnson-Cook公式应用范围的材料参数。在切屑成形仿真模型中,使用新建立的Jonhson-Cook材料模型,将仿真结果同实验进行对比,验证了模型的准确性。
The Johnson-Cook model of 2Cr13 material was fitted using a quasi-static compression experiment and a cutting experiment. Compression experiments were used to obtain the coefficients of the material model at low strain rates and the cutting experiments were used to obtain the material coefficients at high strain rates. Since the maximum strain rate obtained by the compression experiment is still several orders of magnitude lower than the minimum strain rate that can be achieved in a cutting experiment, strain extrapolation was used to obtain the material parameters that meet the Johnson-Cook formula. In the chip forming simulation model, the newly established Jonhson-Cook material model was used to compare the simulation results with the experiment, which verified the accuracy of the model.