关键词: J-C参数, 有限元仿真, 切削力, 切屑形态, 残余应力

Abstract: To improve the accuracy of determine and correct the material constitutive model parameters from finite element simulation,it needs to clear that how the changes of the model parameters affect the cutting process simulation results,the orthogonal cutting model of machining 45 carbon steel was established by using AdvantEdge FEM software,the custom defined material model was used to vary the level of each parameter in Johnson-Cook(J-C) constitutive model,and then the effects of each J-C parameter (A,B,n,C,m) on cutting forces,chip morphology and residual stresses were studied.The simulation results show that cutting forces changes little at first and then increase sharply as the parameter C increases,and increase linearly as the other parameters increase;chip morphology becomes thinner when A and C increase,but becomes thicker when n and m increase,and changes little as B increases;the maximum residual tensile stress,compressive residual stress and its depth are more sensitive to C and m,A and n,C,respectively.

Key words: J-C parameters, finite element simulation, cutting forces, chip morphology, residual stresses