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    Experimental and Numerical Validation of a Ductile Fracture Local Criterion Based on a Simulation of Cavity Growth

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    A local criterion based on the simulation of hole growth by plastic deformation has been evaluated. Fracture of a material volume is reached for an assumed critical value of cavity growth. This critical value is determined from notched tensile tests. When dealing with cracked geometries, a process zone is introduced at the crack tip. This zone is modeled as the first mesh element (a)c at the crack tip in a finite-element code. The size of this element, which is a material constant, is measured from a conventional compact tension (CT) test. Different tests with cracked geometries were carried out on side-grooved CT specimens of different sizes (25 and 50-mm width) and on axisymmetrically cracked tensile bars (TA) with 15, 30, and 50-mm outer diameters. In all cases the fracture was flat with no shear lips. Keeping the parameters of the fracture local criterion constant, crack initiation and crack propagation were modeled using the node release technique. The numerical procedure and results are described in detail. The model results are shown to be in good agreement with the experimental results.


    fracture local criteria, cracked round bars, ductile fracture, crack initiation, stable crack growth, J, -integral, A508 steel, fracture mechanics, nonlinear fracture mechanics

    Author Information:

    Devaux, J-C
    Head, Research and Development Group,

    Mudry, F
    Vice-president and professor, Ecole,

    Pineau, A
    Vice-president and professor, Ecole,

    Rousselier, G
    Head, Laboratory,

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP27699S