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A damage indicator is introduced, derived from traction structural stress, to evaluate the fatigue life of welded structures subjected to random vibrational loads. The equivalent traction structural stress (ETSS) approach is adapted for frequency-domain applications, with the parameter’s power spectral density (PSD) function formulated as a linear combination of specific PSD matrix components corresponding to stress distributions in the weld seam area. Using this damage indicator at critical fatigue locations, along with the probability density function (PDF) of rainflow stress amplitudes and the reference S-N curve for welded joints, the fatigue life of welded structures under frequency-domain random vibrations can be predicted. Random vibration fatigue tests are conducted on welded S355J2W alloy plate specimens, examining both fracture patterns and fatigue life performance. A comparison between experimental fatigue lives and those predicted by the proposed approach confirms the model’s reliability in estimating random vibration fatigue life.

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Theoretical and Experimental Research on Spectral Method for Random Vibration Fatigue Life Prediction of Welded Joints

  • 会议论文

  • 发表日期：

    2026年

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  • Daiyang Gao,
  • Guangyuan Shi,
  • Wenhe Liao

摘要

A damage indicator is introduced, derived from traction structural stress, to evaluate the fatigue life of welded structures subjected to random vibrational loads. The equivalent traction structural stress (ETSS) approach is adapted for frequency-domain applications, with the parameter’s power spectral density (PSD) function formulated as a linear combination of specific PSD matrix components corresponding to stress distributions in the weld seam area. Using this damage indicator at critical fatigue locations, along with the probability density function (PDF) of rainflow stress amplitudes and the reference S-N curve for welded joints, the fatigue life of welded structures under frequency-domain random vibrations can be predicted. Random vibration fatigue tests are conducted on welded S355J2W alloy plate specimens, examining both fracture patterns and fatigue life performance. A comparison between experimental fatigue lives and those predicted by the proposed approach confirms the model’s reliability in estimating random vibration fatigue life.