Research on Warm Deformation Behavior of AZ31B Magnesium Alloy Based on Damage Coupled Viscoplastic Model
In order to accurately describe the hardening,damage and fracture behavior of AZ31B magnesium alloy during warm deformation,a constitutive model based on the viscoplasticity model coupled with the GTN damage model was developed.Warm tensile tests were performed on the material samples at different temperatures and strain rates.Stress-strain curves under the thermal deformation of the alloy were obtained.Based on the material high-temperature deformation mechanism and taking the dislocation density as the internal variable,the viscoplastic model was established to describe the hardening behavior of the material,and the intelligent algorithm was used to identify the material parameters of the model.In order to describe the evolution of material damage during warm deformation,the GTN damage model was coupled with the established viscoplasticity model,a warm stretching simulation finite element model was established.The damage model parameters were reversed by using Kriging proxy model combined with intelligent algorithm.Finally,the established damage coupled viscoplastic model is used to analyze the damage evolution during warm tensile process and predict the fracture behavior of the warm bulge test,and compared with the experimental results.The results show that the constitutive model can accurately predict the damage and fracture of AZ31B during warm deformation.
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