Material parameter optimization method and system for isotropic viscoplastic constitutive model

The invention discloses a material parameter optimization method and system for an isotropic viscoplastic constitutive model, and relates to the field of modeling and analysis of mechanical properties of materials, and the method comprises the following steps: establishing a viscoplastic constitutive model of an isotropic material, and carrying out dimension reduction expression to obtain a simplified constitutive model; grouping the material parameters according to different effects of the material parameters in the simplified constitutive model on the mechanical behaviors of the isotropic material to obtain a plurality of material parameter groups; determining an optimization sequence of each material parameter group according to different influence degrees of each material parameter group on the mechanical behavior of the isotropic material; and optimizing the material parameters in each material parameter group by adopting an iterative algorithm based on the simplified constitutive model and the optimizat