Weld residual stress and fatigue strength of flanged edge welded joints in ferritic stainless steel

Shigenobu Kainuma, Ryuji Nakane, Naofumi Hosomi

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

Flanged edge welded joints are often used to join the same edge planes of two thin plates in a ferritic steel structure. They have crack-like incomplete root penetration, where stress concentration is very high. When the structures are subjected to repeated stress which exceeds a certain fatigue limit, fatigue cracks will initiate and propagate from the flanged edge welded joints. However, the fatigue behavior of the welded joint has not been investigated. In this research, in order to investigate the weld residual stress near the weld root tip of the flanged edge welded joints, both the measurement using sectioning method and the thermo-elastoplastic analysis were carried out. In addition, fatigue tests and fatigue crack propagation analyses were also performed on the welded joint to clarify the fatigue strength quantitatively. The experimental and analytical results of the residual stress showed that there was high compressive residual stress near the weld root tips. The fatigue test results indicated that all fatigue cracks in eight test specimens initiated at the weld roots. Their fatigue strengths at 2 × 106 cycles for the weld throat section was approximately 1.9 MPa and the fatigue limit was about 1.2 MPa. The results of fatigue life analysis showed that when the main plate thickness varied from 1.0 mm to 4.0mm, the fatigue strength increased in proportion to approximately 0.7 times of the main plate thickness.

本文言語英語
ページ(範囲)117-124
ページ数8
ジャーナルYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
22
1
DOI
出版ステータス出版済み - 2 2004
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料力学
  • 機械工学
  • 表面、皮膜および薄膜
  • 金属および合金

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