Volume 27, Issue 1 (January 1999)

    The Influence of Irregularities in the Crack Shape on the Crack Extension Measurement by Means of the Direct-Current-Potential-Drop Method

    (Received 24 November 1997; accepted 17 July 1998)

    CODEN: JTEOAD

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    Abstract

    The equations used for calculating the crack extension from the change in the potential drop at a fracture mechanics specimen are generally derived for perfectly straight crack fronts. In the practice of fracture mechanics tests the crack, however, usually grows faster in the interior of the specimen than at the exterior, leading to a curved crack front. For such a case we calculate the potential drop by means of a finite difference scheme. It is shown that for curved cracks the usual procedure of the direct-current-potential-drop method underestimates the real crack extension. The same finite difference scheme is then used to account for conductive bars and bridges, which sometimes are left behind the crack front. Finally, the influence of side grooves on the potential drop is investigated.


    Author Information:

    Riemelmoser, FO
    Erich-Schmid-Institute for Material Sciences of the Austrian Academy of Sciences, Leoben,

    Pippan, R
    Erich-Schmid-Institute for Material Sciences of the Austrian Academy of Sciences, Leoben,

    Weinhandl, H
    Erich-Schmid-Institute for Material Sciences of the Austrian Academy of Sciences, Leoben,

    Kolednik, O
    Erich-Schmid-Institute for Material Sciences of the Austrian Academy of Sciences, Leoben,


    Stock #: JTE12039J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12039J

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    Author
    Title The Influence of Irregularities in the Crack Shape on the Crack Extension Measurement by Means of the Direct-Current-Potential-Drop Method
    Symposium , 0000-00-00
    Committee E08