An Entropy-Based Failure Prediction Model for Thermomechanical and Isothermal Fatigue Process

Document Type : Research Article

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School of Mechanical Engineering Iran University of Science andTechnology, Tehran, Iran

Abstract

This work aims to evaluate the thermomechanical and isothermal fatigue behavior of an Inconel 718 specimen under various loading conditions, including low-cycle fatigue (LCF) at 350°C and 650°C, as well as in-phase (IP) and out-of-phase (OP) thermal loading cycles. An entropy-based approach combined with finite element analysis and continuum damage mechanics was used to examine the fatigue response under three different mechanical loading conditions. The ABAQUS program facilitated the development of the finite element model, while the model for predicting fatigue life was evaluated using the USDFLD subroutine code. The entropy-based approach, rooted in Boltzmann theory and continuum damage mechanics, enabled the calculation of entropy growth rates and damage accumulation parameters. The results show that the entropy-based method accurately captures the trends in fatigue life and damage formation under thermomechanical and isothermal fatigue conditions. These findings support previous experimental results, confirming the reliability and accuracy of the entropy-based model in predicting material degradation. This study highlights the value of using entropy as a precise parameter for assessing fatigue behavior, which is vital to developing more durable materials for high-performance applications.

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Amirkabir Journal of Mechanical Engineering
Volume 57, Issue 6
September 2025
Pages 773-794

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