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Structural hot-spot stress approach for toe cracking from plate edge of load-carrying welded attachment

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Abstract

The structural hot-spot stress approach is an effective method for assessing welding details when nominal stress is hard to determine due to geometric or loading complexities. Hot spots can be classified into two types: type “a,” which refers to a weld toe located on a plate surface, and type “b,” denoting one located on a plate edge. Previous studies on type “b” hot spots have mainly focused on in-plane gusset welded joints, and the applicability of type “b” hot-spot S-N curves proposed for in-plane gusset joints in IIW to the other details is not well understood. In this study, fatigue tests were conducted with a load-carrying attachment welded on a plate surface, where a crack occurred from a weld toe on the plate edge. The tests were also numerically simulated using finite element analysis. Upon evaluating the test results through the nominal stress, structural hot-spot stress (4, 8, and 12 mm method), and notch stress approaches, it was found that all the data lie above FAT71 for nominal stress, FAT100 for hot-spot stress, and FAT225 for effective notch stress.

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Acknowledgements

They would also like to express their sincere gratitude to Mr. Yoshimine at Nippon Sharyo, Ltd. for fabricating the specimens.

Funding

The authors gratefully acknowledge the support provided by the Japan Society for the Promotion of Science (JSPS) KAKENHI (Grant Number 21K04233).

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Authors and Affiliations

  1. Nagoya University, Nagoya, Aichi, Japan

    Takeshi Hanji, Kazuo Tateishi, Nima Rabsel & Masaru Shimizu

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  1. Takeshi Hanji
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  2. Kazuo Tateishi
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  3. Nima Rabsel
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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., Rabsel, N. et al. Structural hot-spot stress approach for toe cracking from plate edge of load-carrying welded attachment. Weld World (2024). https://doi.org/10.1007/s40194-024-01724-6

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  • DOI: https://doi.org/10.1007/s40194-024-01724-6

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