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<p>The definition of Hot Spot Stress (HSS) suitable for fatigue assessment of structures is investigated based on the results of structural model fatigue tests and relevant Finite Element Analysis. It is confirmed that, using the HSS defined by linear extrapolation of stresses at read-out points of 15&#xa0;mm and 45&#xa0;mm away from the weld toe, independent of the plate thickness, the fatigue strength of structural models with plate thicknesses from 10 to 80&#xa0;mm can be assessed by the UK-HSE D curve without thickness correction. On the other hand, for simple joints, such as conventional fatigue specimens or a welded attachment on a structure, the stress read-out points for determining HSS must be close to the hot spot position, such as 5&#xa0;mm and 15&#xa0;mm. The difference between the two cases depends on the region where the stress increase occurs due to stress concentration; therefore, it is found necessary to set different stress read-out points. By using different definitions, it is found that the same single S–N diagram (UK-HSE D) can be used for fatigue assessment from simple joints to thick plate structures.</p>

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Empirical study on the definition of structural hot spot stress

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Norio Yamamoto,
  • Satoyuki Tanaka

摘要

The definition of Hot Spot Stress (HSS) suitable for fatigue assessment of structures is investigated based on the results of structural model fatigue tests and relevant Finite Element Analysis. It is confirmed that, using the HSS defined by linear extrapolation of stresses at read-out points of 15 mm and 45 mm away from the weld toe, independent of the plate thickness, the fatigue strength of structural models with plate thicknesses from 10 to 80 mm can be assessed by the UK-HSE D curve without thickness correction. On the other hand, for simple joints, such as conventional fatigue specimens or a welded attachment on a structure, the stress read-out points for determining HSS must be close to the hot spot position, such as 5 mm and 15 mm. The difference between the two cases depends on the region where the stress increase occurs due to stress concentration; therefore, it is found necessary to set different stress read-out points. By using different definitions, it is found that the same single S–N diagram (UK-HSE D) can be used for fatigue assessment from simple joints to thick plate structures.