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Fatigue crack growth prediction of welded joints in low-cycle fatigue region

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Abstract

Low-cycle fatigue is one of the failure modes in steel structures during earthquakes. With a focus on crack growth in the low-cycle fatigue region, this study developed a fatigue crack growth curve and verified its applicability to crack growth prediction in welded joints. Fatigue crack growth tests under highly plastic conditions were performed using compact tension specimens with side grooves. The results indicate that the crack growth rate in the low-cycle fatigue region correlates with the cyclic J-integral range, which can be calculated using finite element analysis. Additionally, the results for both plain steel and weld metal were distributed in the same region within a narrow band. Based on the results, a formula for the fatigue crack growth rate under large cyclic strains was proposed. Low-cycle fatigue tests were then performed on welded joints to clarify their crack growth behavior, and the crack growth observed in these tests was compared with the crack growth calculated using the proposed formula. The calculation results were found to be in relatively good agreement with the experimental results, verifying the applicability of the formula.

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Acknowledgements

The authors acknowledge the support of Chubu Electric Power Co., Inc. in Japan and express our sincere gratitude to Dr. Matsumura at The Takigami Steel Construction Co., Ltd. in Japan for specimen fabrications.

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Authors and Affiliations

  1. Nagoya University, Nagoya, Japan

    Takeshi Hanji, Kazuo Tateishi, Nao Terao & Masaru Shimizu

Authors
  1. Takeshi Hanji
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  2. Kazuo Tateishi
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  3. Nao Terao
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  4. Masaru Shimizu
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Correspondence to Takeshi Hanji.

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Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures

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Hanji, T., Tateishi, K., Terao, N. et al. Fatigue crack growth prediction of welded joints in low-cycle fatigue region. Weld World 61, 1189–1197 (2017). https://doi.org/10.1007/s40194-017-0504-3

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  • DOI: https://doi.org/10.1007/s40194-017-0504-3

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