This paper improved Chaboche viscoplastic constitutive model in order to simulate the mechanical behavior of engineering components during service. The anisotropic tensor and Kachanov damage evolution equation were added to the constitutive equation to simulate the creep behavior of anisotropic material. Based on that, the Levenberg-Marquardt nonlinear optimization algorithm was used to obtain material parameters and the constitutive model was compiled as the subprogram of finite element software ABAQUS for its simulation application. Then the improved constitutive model was used to simulate and analyse the uniaxial tensile and creep behavior of specimens made of anisotropic material DZ125 at different loads, and the accuracy and feasibility of material parameters and constitutive model were verified by corresponding test results. Finally, the improved constitutive model was used to simulate the creep behavior of a hollow turbine blade, achieving its engineering application. And the calculated results have great significance for structure design and life prediction of turbine blade.

本文对Chaboche粘塑性本构模型进行了改进，以模拟工程部件在服役期间的力学行为。将各向异性张量和Kachanov损伤演化方程添加到本构方程中，以模拟各向异性材料的蠕变行为。在此基础上，采用Levenberg-Marquardt非线性优化算法获得材料参数，并将本构模型作为有限元软件ABAQUS的子程序进行编译，以进行仿真应用。然后使用改进的本构模型对各向异性材料DZ125制成的试样在不同载荷下的单轴拉伸和蠕变行为进行仿真和分析，并通过相应的试验结果验证了材料参数和本构模型的准确性和可行性。最后，改进的本构模型被用于模拟空心涡轮叶片的蠕变行为，实现了其工程应用。计算结果对涡轮叶片的结构设计和寿命预测具有重要意义。