Application of the Master Curve Method and the Engineering Lower Bound Toughness Method to Laser Welded Steel

    Volume 31, Issue 3 (May 2003)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 7


    Heerens, J
    G-KSS Research Centre, Geesthacht,

    Hellmann, D
    G-KSS Research Centre, Geesthacht,

    (Received 14 January 2002; accepted 17 December 2002)

    Abstract

    The fracture toughness of laser beam welded ferritic steel has been measured in the ductile-to-brittle transition regime using precracked bend specimens. The precracked welded specimens showed a complex fracture behavior, which involves crack path deviation. It was found that the large scatter of the cleavage fracture toughness and its temperature dependence can be characterized by the Master Curve Method (MCM). The results promote the validity of Engineering Lower Bound Method (ELBM) to derive lower bound toughness of laser beam welded steel. To enable a successful application of the Methods, it was necessary to add fracture toughness data censoring to the method, which takes into account the phenomenon of crack path deviation. The application of the censoring criterion requires additional fracture surface investigations, which can be performed easily using a conventional low magnification light microscope.


    Paper ID: JTE12419J

    DOI: 10.1520/JTE12419J

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    Author
    Title Application of the Master Curve Method and the Engineering Lower Bound Toughness Method to Laser Welded Steel
    Symposium , 0000-00-00
    Committee A01