本发明提供一种金属材料在复杂应力状态下的三维断裂模型建立方法，包括设计第一组试样和第二组试样；采用非线性拉伸力对所述第一组试样进行准静态标准拉伸试验，获得该第一组试样的真应力‑塑形应变曲线，将该第一组试样的真应力‑塑形应变曲线输入该第二组试样中各种试样类型对应的材料数值试验模型中，获得该第二组试样中各种试样类型对应的应力三轴度η、归一化洛德角参数；采用该非线性拉伸力对所述第二组试样中各种类型的试样进行断裂试验，获得该第二组试样中各种试样类型对应的临界断裂应变值；根据该第二组试样中每种试样类型的应力三轴度η、归一化洛德角参数和临界断裂应变值，得到金属材料在复杂应力状态下的三维断裂模型。

The invention provides a method for establishing a three-dimensional fracture model of a metal material under a complex stress state, including designing a first group of samples and a second group of samples; The quasi-static standard tensile test is carried out on the first group of samples by using the nonlinear tensile force to obtain the true stress ‑ plastic strain curve of the first group of samples, and the true stress ‑ plastic strain curve of the first group of samples is input into the material numerical test model corresponding to various sample types in the second group of samples, Obtain the stress triaxiality corresponding to various sample types in the second group of samples η、 Normalized Lode angle parameter; Performing a fracture test on various types of samples in the second group of samples using the nonlinear tensile force to obtain the critical fracture strain values corresponding to various types of samples in the second group of samples; According to the stress triaxiality of each sample type in the second group of samples η、 The three-dimensional fracture model of metal materials under complex stress state is obtained by normalizing the Lode angle parameter and critical fracture strain.