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Research on influence parameters and fatigue life prediction method of weld with undercut imperfection

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Abstract

ISO5817 standard is widely used to define the quality levels of undercut in engineering, and the fatigue life is evaluated by traditional fatigue assessment method, which has some limitations such as difficulty in parameter matching and high modeling accuracy. The structural stress method based on fracture mechanics and crack growth law has overcome the limitations. In this paper, the simulation method and formula method based on equivalent structural stress are put forward firstly, and the fatigue life prediction ability of these methods for undercut imperfection is verified. Then, the influence parameters of undercut are summarized and analyzed. Based on the stress distribution at the notch, a new method for predicting fatigue life with undercut imperfection, i.e., zero-point characteristic structural stress method, is put forward, and its ability and accuracy are verified by test data.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors gratefully acknowledge the financial support through National High-speed Train Qingdao Technology Innovation Center Funded Project (CXKY-02-08(2019)), Liaoning Province Higher Education Innovation Team Support Plan (LT2006010), and Dalian Science and Technology Innovation Fund (2019J11CY017).

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Authors and Affiliations

  1. College of Mechanical Engineering, Dalian Jiaotong University, 794 Huanghe Road, Shahekou District, Dalian, China

    Zhengping He

  2. College of Locomotive and Rolling Stock Engineering, Dalian Jiaotong University, Dalian, China

    Bingzhi Chen

  3. CRRC QIQIHAR CO., LTD, Qiqihar, China

    Xiangwei Li

Authors
  1. Zhengping He
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  2. Bingzhi Chen
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  3. Xiangwei Li
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Correspondence to Bingzhi Chen.

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

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He, Z., Chen, B. & Li, X. Research on influence parameters and fatigue life prediction method of weld with undercut imperfection. Weld World 67, 1581–1594 (2023). https://doi.org/10.1007/s40194-023-01507-5

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  • DOI: https://doi.org/10.1007/s40194-023-01507-5

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