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<p>In this study, axial fatigue (tension–tension) tests were performed on friction stir welded (FSW) butt joints of AZ31B magnesium alloy to evaluate their fatigue behavior. Infrared thermography and digital image correlation (DIC) techniques were used to monitor the evolution of temperature and strain fields in real time during cyclic loading. Microstructural analysis identified the advancing side (AS) as the critical region for crack initiation, due to stress concentration and limited slip systems. To quantify fatigue damage, the concept of fatigue fracture entropy was applied to the AS region. The relationship between entropy generation and fatigue cycles was established, and a predictive model for fatigue life was developed. The predicted fatigue limit deviated by less than 10% from the experimental result, and the estimated fatigue lives agreed well with experimental data. These findings confirm that the entropy-based approach provides a reliable and efficient method for fatigue life prediction of AZ31B magnesium alloy FSW joints.</p>

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Fatigue Life Assessment of AZ31B Magnesium Alloy Friction Stir Welded Joints Based on Local Thermodynamic Entropy

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Bowen Song,
  • Jie Gao,
  • Shubang Wang,
  • Xiuli He,
  • Dinglu Wu,
  • Zhifeng Yan

摘要

In this study, axial fatigue (tension–tension) tests were performed on friction stir welded (FSW) butt joints of AZ31B magnesium alloy to evaluate their fatigue behavior. Infrared thermography and digital image correlation (DIC) techniques were used to monitor the evolution of temperature and strain fields in real time during cyclic loading. Microstructural analysis identified the advancing side (AS) as the critical region for crack initiation, due to stress concentration and limited slip systems. To quantify fatigue damage, the concept of fatigue fracture entropy was applied to the AS region. The relationship between entropy generation and fatigue cycles was established, and a predictive model for fatigue life was developed. The predicted fatigue limit deviated by less than 10% from the experimental result, and the estimated fatigue lives agreed well with experimental data. These findings confirm that the entropy-based approach provides a reliable and efficient method for fatigue life prediction of AZ31B magnesium alloy FSW joints.