The Use of an Alternative Method for Fracture Toughness Evaluation on Different Materials

    Volume 32, Issue 5 (September 2004)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 8


    Guardiola, M
    Engineer, REPSOL YPF, Buenos Aires, Argentina

    Bernal, C
    Research Doctor, Institute of Materials Science and Technology (INTEMA), Mar del Plata,

    Martínez, R
    Research Doctor, Institute of Materials Science and Technology (INTEMA), Mar del Plata,

    Cassanelli, A
    Research Doctor, National University of Mar del Plata, Mar del Plata,

    (Received 9 June 2003; accepted 17 March 2004)

    Abstract

    Through this paper an alternative procedure to obtain fracture toughness parameters on blunt-notched samples rather than on standard sharp-notched samples has been applied to several materials which display different fracture behavior. An aluminum alloy, an austempered ductile iron (ADI), and two different polymeric materials, polyamide 6 and poly(methyl methacrylate) (PMMA), were tested. The use of the alternative methodology allows simplification and cost reduction in fracture toughness evaluation. For the aluminum alloy, the fracture parameter obtained by this method was 16 % lower than that determined using ASTM standard methodology with data scatter similar to that reported in literature. For the ADI, fracture toughness values from blunt-notched samples were close to those obtained using standard test samples, showing low sensitivity to the changes in the crack tip diameter. For polyamide 6, the alternative methodology led to a toughness value within the same range of the values obtained from the traditional technique. In the case of the PMMA, the KIc values obtained from both methods showed good agreement.


    Paper ID: JTE11977

    DOI: 10.1520/JTE11977

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    Author
    Title The Use of an Alternative Method for Fracture Toughness Evaluation on Different Materials
    Symposium , 0000-00-00
    Committee E28