STP945

    Modifications of ASTM E 813-81 Standard Test Method for an Improved Definition of JIc Using New Blunting-Line Equation

    Published: Jan 1988


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    Abstract

    A test procedure for determining the fracture resistance of ductile metallic materials under stable crack growth conditions is described. The procedure consists of the determination of a Ja curve with particular emphasis on the near-initiation region. In our proposal, JIc is defined as the fracture resistance at 0.2-mm stable ductile tearing. It is determined by the intersection of the Ja curve with an intercept line which is parallel to and 0.2 mm off the blunting line. The blunting-line formula is improved by accounting for the strain hardening behavior of the material. A simple determination of the blunting-line equation is shown, and its applicability is checked using a broad range of materials.

    Keywords:

    blunting line, resistance against crack growth, ductile tearing, crack initiation, fracture toughness, stretch zone


    Author Information:

    Heerens, J
    Research engineer, head of department, and research engineer, GKSS Research Center Geesthacht, Geesthacht,

    Schwalbe, K-H
    Research engineer, head of department, and research engineer, GKSS Research Center Geesthacht, Geesthacht,

    Cornec, A
    Research engineer, head of department, and research engineer, GKSS Research Center Geesthacht, Geesthacht,


    Paper ID: STP23253S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP23253S


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