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<p>The document presents a comprehensive investigation into the fatigue strength assessment of welded fasteners, specifically bolts and nuts, used in various engineering applications. A fatigue strength assessment approach using a structural stress concept is established, accounting for the influence of mounting pre-loads and residual stresses from the welding process. With the developed approach, the fatigue strength of all investigated variants can be assessed with a scatter of 1:2. The experimental investigations showed that an early decrease in pre-load forces negatively affects the fatigue strength. While pre-load forces can enhance fatigue strength, a reduction in pre-load during service loading must be avoided to ensure a safe life.</p>

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Fatigue strength assessment of welded steel fasteners using structural stress concept with consideration of the mounting pre-load

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月23日

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  • A. Jöckel,
  • J. Baumgartner,
  • B. Möller,
  • M. Timmermann,
  • H. T. Beier,
  • P. Yadegari

摘要

The document presents a comprehensive investigation into the fatigue strength assessment of welded fasteners, specifically bolts and nuts, used in various engineering applications. A fatigue strength assessment approach using a structural stress concept is established, accounting for the influence of mounting pre-loads and residual stresses from the welding process. With the developed approach, the fatigue strength of all investigated variants can be assessed with a scatter of 1:2. The experimental investigations showed that an early decrease in pre-load forces negatively affects the fatigue strength. While pre-load forces can enhance fatigue strength, a reduction in pre-load during service loading must be avoided to ensure a safe life.