Modified Logistic Creep Strain Prediction Model and Its Finite Element Implementation

doi:10.3901/JME.2023.16.082

Abstract

Abstract: A modified logistic creep strain prediction(LCSP) model for the whole creep process is proposed to reduce the number of model parameters and to solve the complex value problem of initial creep strain. Combined with the data of creep deformation and rupture life of the vanadium-modified 2.25Cr1Mo steel, the model parameter identification method based on the principle of least square method is used to accurately predict the creep strain and its strain rate of materials. The life prediction accuracy of the Larson-Miller master curve equation and the variation trend of rupture life with stress are comprehensively analysed, and hence the order of the polynomial in the model that is used to predict the creep rupture life is determined. According to the analytical formula of the creep strain in the modified LCSP model, the calculation expressions of the creep strain increment and its derivatives to the equivalent stress and to the creep strain are derived, in order to ensure the calculation convergence. The usercreep subroutine for the modified LCSP model is developed by using Fortran language. The accuracy of the creep subroutine is verified through the finite element analysis of creep for the smooth round bar specimen.

Key words: creep, constitutive model, finite element analysis, deformation, rupture life

CLC Number:

TG113

ZHOU Yu, FAN Zhichao, JIANG Heng, WANG Yuxuan. Modified Logistic Creep Strain Prediction Model and Its Finite Element Implementation[J]. Journal of Mechanical Engineering, 2023, 59(16): 82-89.

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