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Abstract <p>To address the lack of a clear classification basis for compiling stress spectra and the lack of a reasonable definition of the parameters of the traditional Corten-Dolan damage model in the current process of predicting structural fatigue life, a life prediction method based on non-equal-interval stress spectra and an improved Corten–Dolan damage model is investigated. By utilizing cluster analysis and support vector machine (SVM) theory, considering the characteristics of the stress cycle itself for spectral compilation, and comprehensively considering the load interaction and strength degradation effect, a systematic structural fatigue life prediction method is formed. Comparison of the obtained non-equal-interval stress spectra damage and improved Corten–Dolan model lifetimes with those obtained via other spectral methods and those obtained via other damage models. The analytical results confirm that the non-equal interval stress spectra and the improved Corten–Dolan damage model exhibit high accuracy.</p>

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Research on a Structural Fatigue Life Prediction Method Based on Non-Equal Interval Stress Spectra and an Improved Corten–Dolan Damage Model

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Daoyun Chen,
  • Weiqiang Zhu,
  • Caiying Luo,
  • Miao Deng,
  • Minshi Zhong,
  • Xinlong Liu,
  • Wenbin Yang,
  • Qian Xiao

摘要

Abstract

To address the lack of a clear classification basis for compiling stress spectra and the lack of a reasonable definition of the parameters of the traditional Corten-Dolan damage model in the current process of predicting structural fatigue life, a life prediction method based on non-equal-interval stress spectra and an improved Corten–Dolan damage model is investigated. By utilizing cluster analysis and support vector machine (SVM) theory, considering the characteristics of the stress cycle itself for spectral compilation, and comprehensively considering the load interaction and strength degradation effect, a systematic structural fatigue life prediction method is formed. Comparison of the obtained non-equal-interval stress spectra damage and improved Corten–Dolan model lifetimes with those obtained via other spectral methods and those obtained via other damage models. The analytical results confirm that the non-equal interval stress spectra and the improved Corten–Dolan damage model exhibit high accuracy.