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<p>This study investigates the fatigue strength of peened-welded joints after single high compressive load peaks. To understand the relaxation behavior of compressive residual stress, out-of-plane gusset welded joints were treated using different peening methods. Compressive residual stress near the peened edge was measured using an X-ray residual stress analyzer while applying plate bending compressive loads. The results showed that compressive residual stresses at 2&#xa0;mm from the peened edge relaxed proportionally with increasing compressive load. Strain measurements at the same location supported the estimation of stress relaxation behavior. Plate bending fatigue tests were then conducted under a stress ratio of <i>R</i> = 0.5. Fatigue strength decreased with increasing compressive load, and under a 5.8 kN (approximately −286 N/mm<sup>2</sup>), the fatigue strength approached that of as-weld. Finally, the fatigue results were evaluated using a newly proposed fatigue strength design curve with a cut-off limit for peening treatment, based on recommendations from the JSSC. It was concluded that this curve remains applicable if the applied compressive load after peening does not exceed 3.8 kN. Furthermore, continuous residual stress monitoring at the 2&#xa0;mm confirmed that fatigue strength improvement remains effective as long as residual compressive stress is preserved during subsequent loading.</p>

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Fatigue strength of peened-welded joints after single high compressive load peaks

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Yuki Banno,
  • Koji Kinoshita,
  • Toshiyuki Ishikawa,
  • Kengo Anami

摘要

This study investigates the fatigue strength of peened-welded joints after single high compressive load peaks. To understand the relaxation behavior of compressive residual stress, out-of-plane gusset welded joints were treated using different peening methods. Compressive residual stress near the peened edge was measured using an X-ray residual stress analyzer while applying plate bending compressive loads. The results showed that compressive residual stresses at 2 mm from the peened edge relaxed proportionally with increasing compressive load. Strain measurements at the same location supported the estimation of stress relaxation behavior. Plate bending fatigue tests were then conducted under a stress ratio of R = 0.5. Fatigue strength decreased with increasing compressive load, and under a 5.8 kN (approximately −286 N/mm2), the fatigue strength approached that of as-weld. Finally, the fatigue results were evaluated using a newly proposed fatigue strength design curve with a cut-off limit for peening treatment, based on recommendations from the JSSC. It was concluded that this curve remains applicable if the applied compressive load after peening does not exceed 3.8 kN. Furthermore, continuous residual stress monitoring at the 2 mm confirmed that fatigue strength improvement remains effective as long as residual compressive stress is preserved during subsequent loading.