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<p>Most commonly used guideline-based procedures for assessing the fatigue strength of welded joints are limited to the high cycle fatigue (HCF) regime. Although calculation methods for the low cycle fatigue (LCF) regime also exist, they are often either too complex for industrial practice or only suitable for rough estimation of fatigue strength. Fatigue tests were conducted on welded joints of varying sheet thicknesses made from S960M and X6CrNiTi18-10 materials, resulting in fatigue lives within the LCF regime. The test results were used to assess the effectiveness of two approaches for enhancing elastic stress analysis: the <i>K</i><sub>e</sub>-factor method and the local strain approach according to FKM-guideline nonlinear extended to welds and considering elastic–plastic material behavior. The influence of the mismatch of welded joints on critical stress conditions leading to failure was also investigated.</p>

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Low cycle fatigue behavior of welded joints in S960M and X6CrNiTi18-10: evaluating Ke-factor and FKM fatigue prediction methods

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月30日

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  • Josef Neuhäusler,
  • Simon Moser,
  • Maximilian Kling,
  • Heinz Thomas Beier,
  • Klemens Rother,
  • Michael Vormwald

摘要

Most commonly used guideline-based procedures for assessing the fatigue strength of welded joints are limited to the high cycle fatigue (HCF) regime. Although calculation methods for the low cycle fatigue (LCF) regime also exist, they are often either too complex for industrial practice or only suitable for rough estimation of fatigue strength. Fatigue tests were conducted on welded joints of varying sheet thicknesses made from S960M and X6CrNiTi18-10 materials, resulting in fatigue lives within the LCF regime. The test results were used to assess the effectiveness of two approaches for enhancing elastic stress analysis: the Ke-factor method and the local strain approach according to FKM-guideline nonlinear extended to welds and considering elastic–plastic material behavior. The influence of the mismatch of welded joints on critical stress conditions leading to failure was also investigated.