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    Volume 49, Issue 6 (March 2021)

    Experimental Proof of Reverse Bending Technique for Modifying Weld Residual Stress in Weld CTOD Specimen and Comparison of Effect with Other Techniques

    (Received 24 September 2020; accepted 8 December 2020)

    Published Online: 15 March 2021

    CODEN: JTEVAB

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    Abstract

    In fracture toughness testing of welds, weld residual stress often makes it difficult to obtain a straight precrack front. Therefore, BS 7448-2, Fracture Mechanics Toughness Tests. Method for Determination of KIc, Critical CTOD and Critical J Values of Welds in Metallic Materials, and ISO 15653, Metallic MaterialsMethod of Test for the Determination of Quasistatic Fracture Toughness of Welds, recommend techniques for modifying weld residual stress to achieve a straight precrack front. BS 7448-2 prescribes three techniques: local compression, reverse bending, and a stepwise high stress ratio (R-ratio) technique. However, in ISO 15653, which was newly published in 2010, the reverse bending technique was rejected because detailed conditions for obtaining a reliable effect were not provided. In the revision of ISO 15653 in 2018, the reverse bending technique was revived with a proposal of appropriate conditions. The present paper reviews the conditions of reverse bending proposed in the revision of ISO 15653, together with the technical background. The effectiveness of the proposed reverse bending conditions is demonstrated experimentally by precracking in weld specimens with a thickness of 127 mm (5 inches). The effects of the two other techniques, i.e., the local compression and stepwise high R-ratio techniques, are also examined, and the effects of each technique on crack front straightness and the required fatigue cycles to finalize precracking are discussed.

    Author Information:

    Tagawa, Tetsuya
    Steel Research Laboratory, JFE Steel Corporation, Chiba,

    Morikage, Yasushi
    JFE Techno-Research Corporation, 1-1 Minamiwatarida-cho, Kawasaki,

    Kubo, Takahiro
    JFE Techno-Research Corporation, Chiba,

    Handa, Tsunehisa
    Steel Research Laboratory, JFE Steel Corporation, Chiba,

    Mikami, Yoshiki
    Joining and Welding Research Institute, Osaka University, Ibaraki,

    Kawabata, Tomoya
    Department of Systems Innovation, The University of Tokyo, Tokyo,


    Stock #: JTE20200577

    ISSN:0090-3973

    DOI: 10.1520/JTE20200577

    Author
    Title Experimental Proof of Reverse Bending Technique for Modifying Weld Residual Stress in Weld CTOD Specimen and Comparison of Effect with Other Techniques
    Symposium ,
    Committee E08