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<p>In response to the problem of inaccurate prediction of fatigue life of notched specimens using the line method based on critical distance theory, this paper proposes a novel LM based on relative stress gradient changes and verifies it in various types of notched specimens. By using this method, we predict three V-notch specimens with different stress concentration factors designed by our team and different material specimens designed by other researchers. The results indicate that the new LM can reduce the average error of fatigue life prediction for V-notch specimens and double hole/double notch specimens from 0.8367 to 0.3392 and from 0.6342 to 0.3599, respectively. The life prediction of GH4169 and TC11 material specimens also shows that this method has extremely high accuracy in predicting the life of notched specimens, demonstrating its good universality.</p>

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A novel line method of the theory of critical distance for predicting the notched specimen's fatigue life based on the relative stress gradient variation

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Yun Zeng,
  • Zhiwan Li,
  • Wanquan Deng,
  • Feng Wang,
  • Zhaokun Wang

摘要

In response to the problem of inaccurate prediction of fatigue life of notched specimens using the line method based on critical distance theory, this paper proposes a novel LM based on relative stress gradient changes and verifies it in various types of notched specimens. By using this method, we predict three V-notch specimens with different stress concentration factors designed by our team and different material specimens designed by other researchers. The results indicate that the new LM can reduce the average error of fatigue life prediction for V-notch specimens and double hole/double notch specimens from 0.8367 to 0.3392 and from 0.6342 to 0.3599, respectively. The life prediction of GH4169 and TC11 material specimens also shows that this method has extremely high accuracy in predicting the life of notched specimens, demonstrating its good universality.