STP833

    Effect of Specimen Dimensions on Critical J-Value at the Onset of Crack Extension

    Published: Jan 1984


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    Abstract

    This paper presents the experimental results of a test program designed to evaluate the effect of specimen dimensions on the critical J transition curve. These tests were conducted, along with KIc measurements, on four quenched-and-tempered medium strength steels with 15 to 200 mm thick specimens. In the cleavage fracture domain, Jc yielded toughness values that overestimated KIc, especially with the smallest specimens. Although ASTM E 813 requirements were met, the cleavage to ductile tearing transition temperature increased with increasing the J-specimen size. The level of the ductile plateau was found to be strongly dependent on the uncracked ligament length. It is pointed out that JIc measurements may overestimate the plane-strain fracture toughness, the ASTM E 813 size requirements being not restrictive enough.

    Keywords:

    fracture criterion, size effect, cleavage, slow crack growth, J, -integral, ferritic steels, ductile brittle transition, elastic-plastic


    Author Information:

    De Roo, P
    Institut de Recherches de la Sidérurgie Française (IRSID), Saint Germain en Laye,

    Marandet, B
    Institut de Recherches de la Sidérurgie Française (IRSID), Saint Germain en Laye,

    Phelippeau, G
    Institut de Recherches de la Sidérurgie Française (IRSID), Saint Germain en Laye,

    Rousselier, G
    Electricité de France (EDF) Les Renardières, Moret Sur Loing,


    Paper ID: STP32576S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP32576S


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