Influence of constitutive model on calculation results of creep deformation response of notched specimen of GH4169 alloy

Abstract

In view of the creep deformation failure of areo-engine high temperature components, the elastoplastic and creep deformation response of GH4169 alloy smooth and notched plate specimens at 650 ℃ is calculated using elastoplastic coupled creep constitutive model based on the large deformation finite element analysis, to explore the influence of creep constitutive model selection on creep deformation response and creep rupture life calculation. The results show that the elastoplastic deformation response of notched plate specimens is well predicted by large deformation analysis, the elastoplastic deformation and ultimate strength of the three notched plate specimens are all well predicted, and the prediction error of ultimate strength is within ± 3%. Three creep models have different predictive effects on creep response and creep rupture life of notched plate specimens under large deformation finite element analysis. The θ-projection model is found to predict the rupture life of notched specimens more accurately within the factor of ± 2. While the modified creep model and the Batsoulas model can predict the deformation of the first two creep stages more accurately.

Keywords

• engine high temperature components
• finite element analysis of large deformation
• creep constitutive model
• creep rupture life
• gh4169 alloy