STP1296: Application of a J-Q Model for Fracture in the Ductile-Brittle Transition

    Landes, JD
    University of Tennessee, Knoxville, TN

    Pages: 14    Published: Jan 1997


    Abstract

    A model to predict cleavage failure of precracked bodies in the transition region for steels was recently proposed by the author. It is based on the concept that the stress-controlled fracture of a weak link triggers the failure of the entire body. The stress that triggers fracture is predicted by a numerical crack-tip stress analysis. The model uses toughness measured at one condition as input to predict toughness at another. For example, toughness measured at one temperature can be used to predict toughness at another temperature, or toughness measured from one geometry can be used to predict toughness for another geometry.

    In this paper the model is applied to predict transition toughness for some cases where the toughness is known so that the predictions from the model can be evaluated. The results show that the predictions have the same trends as many of the measured transition toughness results. The model is also applied to several component-type geometries to show that it can be used to transfer laboratory results to structural component models.

    Keywords:

    transition, fracture, toughness, modeling, crack tip, stress, weak link


    Paper ID: STP16226S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP16226S


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