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<p>Fatigue is a leading cause of structural material failure, making accurate prediction of fatigue crack growth and residual life critical for safe design and maintenance. This study aimed to predict the residual life of fatigue cracks in structural components subjected to bending loads. A four-point bending model was analyzed using the S-version finite element method (S-version FEM), incorporating Paris’s Law and the Frost and Pook fatigue crack growth models. Predictive models were validated against experimental data from Al7075-T6. S-version FEM simulations exhibited errors below 20% across various loading sequences, demonstrating the robustness of the modeling approach. Comparisons indicated that the Frost and Pook model produced predictions more closely aligned with experimental observations than Paris’s Law. These findings underscore the potential of integrating S-version FEM with established fatigue crack growth models for reliable residual life assessment, facilitating optimization of structural integrity and extension of service life.</p>

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Evaluation of Paris’s Law and Frost and Pook Models for Fatigue Life Prediction via S-version Finite Element Method

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • M. N. M. Husnain,
  • M. R. M. Akramin,
  • M. S. Shamil,
  • Akiyuki Takahashi,
  • A. A. Razak,
  • M. R. Jamli

摘要

Fatigue is a leading cause of structural material failure, making accurate prediction of fatigue crack growth and residual life critical for safe design and maintenance. This study aimed to predict the residual life of fatigue cracks in structural components subjected to bending loads. A four-point bending model was analyzed using the S-version finite element method (S-version FEM), incorporating Paris’s Law and the Frost and Pook fatigue crack growth models. Predictive models were validated against experimental data from Al7075-T6. S-version FEM simulations exhibited errors below 20% across various loading sequences, demonstrating the robustness of the modeling approach. Comparisons indicated that the Frost and Pook model produced predictions more closely aligned with experimental observations than Paris’s Law. These findings underscore the potential of integrating S-version FEM with established fatigue crack growth models for reliable residual life assessment, facilitating optimization of structural integrity and extension of service life.