Analysis of Roughness-Induced Crack-Tip Shielding in Terms of Size Ratio Effect

    Volume 2, Issue 4 (April 2005)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 4 April 2005

    Page Count: 15


    Pokluda, J
    Professor, Brno University of Technology, Brno, CZ

    Šandera, P
    Associate Professor, Brno University of Technology, Brno, CZ

    Horniková, J
    Assistant Professor, Brno University of Technology, Brno, CZ

    (Received 29 October 2003; accepted 16 June 2004)

    Abstract

    A new theoretical concept is introduced to describe the roughness-induced shielding effects in metallic materials. It is based on the statistics of the local ratio between the characteristic microstructure distance and the plastic zone size. Both the crack branching and the crack closure phenomena are generally described in the frame of linear elastic fracture mechanics under the assumption of the remote Mode I loading. Using this approach, intrinsic values of fracture toughness and fatigue crack growth threshold can be determined, and the roughness-induced component can be separated from other closure components, such as plasticity or oxide induced closure. In order to estimate the total RIS effect, standard material data as the yield stress, the mean grain size, the surface roughness, and the fracture mode are only necessary. Application examples concerning static fracture and fatigue are presented for UHSLA steels, ARMCO iron, aluminum, and titanium alloys.


    Paper ID: JAI11997

    DOI: 10.1520/JAI11997

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    Title Analysis of Roughness-Induced Crack-Tip Shielding in Terms of Size Ratio Effect
    Symposium Fatigue and Fracture Mechanics: 34th Volume, 2003-11-21
    Committee E08