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<p>Heavy components exhibit heterogeneity due to current technological limitations, posing risks to their longevity. Understanding methods for predicting the lifespan of such components is crucial for ensuring operational safety. This study focuses on a large forged shaft as the research subject. A series of experiments and predictive methods were employed to establish a lifespan prediction approach for this shaft. Initially, the distribution characteristics of inclusions and mechanical properties within the large forged shaft were investigated. Subsequently, an improved fatigue life prediction method based on Wang’s model was developed by integrating Tanaka and Mura’s crack initiation life prediction method with Hong’s hypothesis. Additionally, a novel technique for predicting the maximum equivalent inclusion size within the heterogeneous large forged shaft was introduced. Finally, a very high cycle fatigue life prediction method for the large forged shaft was established.</p>

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A Novel Method to Estimate the Fatigue Properties of Large Forged Shafts

  • 期刊论文

  • 发表日期：

    2026年2月6日

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  • Long Liu,
  • Zikai Dong,
  • Fei Sun,
  • Linan Tian,
  • Bo Ma,
  • Changan Liu,
  • Zhengci Wang,
  • Wei Sun,
  • Ming Zhang

摘要

Heavy components exhibit heterogeneity due to current technological limitations, posing risks to their longevity. Understanding methods for predicting the lifespan of such components is crucial for ensuring operational safety. This study focuses on a large forged shaft as the research subject. A series of experiments and predictive methods were employed to establish a lifespan prediction approach for this shaft. Initially, the distribution characteristics of inclusions and mechanical properties within the large forged shaft were investigated. Subsequently, an improved fatigue life prediction method based on Wang’s model was developed by integrating Tanaka and Mura’s crack initiation life prediction method with Hong’s hypothesis. Additionally, a novel technique for predicting the maximum equivalent inclusion size within the heterogeneous large forged shaft was introduced. Finally, a very high cycle fatigue life prediction method for the large forged shaft was established.