面向金属切削过程数值模拟的材料本构方程和刀-屑摩擦特性

为了提高金属切削过程的数值模拟精度,围绕与其密切相关的材料本构方程和刀-屑摩擦特性展开研究。针对铝合金7050-T7451材料,采用分离式霍普金森压杆实验（Split Hopkinson Pressure Bar,SHPB）获取材料本构方程,采用正交切削实验获取切削过程的刀-屑摩擦曲线。对AdvantEdge FEM软件进行二次开发,输入材料本构方程和刀-屑摩擦系数,研究切屑厚度、剪切角、应变、应变率等切削过程典型特征随切削参数的变化规律。结果表明：所提出的数值模拟方法对切削过程的典型特征具有很好的预测效果,在AdvantEdge FEM软件中输入合适的材料本构方程和刀-屑摩擦系数能够明显提高数值模拟精度。

Tool-chip Friction Characteristics and Material Constitutive Equation Oriented to Numerical Simulation in Metal Cutting Process

In order to improve the physical simulation accuracy in metal cutting process, material constitutive equation and tool-chip friction characteristics were investigated. For the aluminum alloy 7050-T7451 material, the method of Split Hopkinson Pressure Bar(SHPB) was used to confirm the material constitutive equation. The orthogonal cutting experiment was used to form the curve of tool-chip friction. Material constitutive equation and coefficient of tool-chip fiction were input based on the secondary development of the AdvantEdge FEM software, the typical characteristics (chip thickness, shear angle, strain and strain rate etc.) variations related to cutting parameters were researched in metal cutting process. The results show that typical characteristics of cutting process was predicted accurately by physical simulation method proposed in this paper, the accuracy of physical simulation can be improved significantly when appropriate material constitutive equation and coefficient of tool-chip are input in the AdvantEdge FEM software.