Volume 9, Issue 4 (July 1981)

    R Curve and Fracture Toughness of Thin Sheet Materials


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    Crack growth resistance R curve tests were done on center-cracked panels of three aluminum alloys. Two methods for the measurement of crack length were compared: the compliance method and the potential method. The latter gives more consistent results. It was found that the stress intensity serves as a correlation parameter for crack growth up to a limiting value of the net section stress that is equal to 0.9 times the yield strength. The fracture stress can be accurately predicted by the R curve concept.

    Author Information:

    Schwalbe, K-H
    Head of Fracture Mechanics GroupMember of ASTM, Research Center Geesthacht (GKSS), Geesthacht,

    Setz, W
    Research engineer, German Aerospace Research Establishment (DFVLR), Linder Höhe, Köln 90,

    Stock #: JTE11226J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11226J

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    Title R Curve and Fracture Toughness of Thin Sheet Materials
    Symposium , 0000-00-00
    Committee E08