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    A Critical Examination of a Numerical Fracture Dynamic Code

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    After upgrading the energy dissipation algorithm, numerical experiments were conducted to assess the reliability of the explicit dynamic finite element code, HCRACK. Two dynamic fracture specimens (that is, the wedge-loaded rectangular double cantilever beam (RDCB) specimen and the wedge-loaded tapered double cantilever beam (TDCB) specimen), which were studied experimentally by Kalthoff, Beinert, and Winkler, were then analyzed with this updated fracture dynamic code. Using the experimentally determined dynamic fracture toughness, KID, versus crack velocity, ˙a, relation, the RDCB specimen was analyzed first by the “propagation method” where good agreements between calculated and measured KID versus a relations were observed. The calculated a versus time, t, relation was then used as input data in the “generation method” where the resultant KID were virtually identical to those obtained in the propagation method. Error analyses of the generation method also were made first by using the experimentally determined a versus t relation and secondly by artificially perturbing this relation.

    A TDCB specimen was then analyzed with both the propagation and generation methods by using the KID versus ˙a relation established for this specimen and the measured a versus t relation, respectively. The computed KID obtained by both methods were in good agreement with the experimental results, showing that either approach can be used in analyzing fracture.


    dynamic fracture, dynamic finite element analysis, dynamic fracture toughness, crack arrest stress intensity factor, fractures (materials), crack propagation

    Author Information:

    Hodulak, L
    Physicist, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,

    Kobayashi, AS
    Professors, University of Washington, Seattle, Wash.

    Emery, AF
    Professors, University of Washington, Seattle, Wash.

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP36971S