STP1171

    Statistical Aspects of Constraint with Emphasis on Testing and Analysis of Laboratory Specimens in the Transition Region

    Published: Jan 1993


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    Abstract

    The effect of specimen thickness, side grooving, large-scale yielding of the ligament, and ductile tearing upon the probability of cleavage fracture initiation is examined within the framework of a general statistical model for cleavage fracture initiation. First, a derivation of the statistical model is presented, and then the model is used to explain the effects of different factors affecting the cleavage fracture probability. As a result, a specimen size requirement for elastic-plastic cleavage fracture toughness testing with bend-type specimens is obtained. Additionally, a simple correction function to validate invalid test results with insufficient ligament size and prior ductile tearing is presented.

    Keywords:

    cleavage fracture initiation, constraint, statistical modelling, fracture toughness testing, transition region


    Author Information:

    Wallin, K
    Senior advisor, Technical Research Center of Finland (VTT), Metals Laboratory, Espoo,


    Paper ID: STP18032S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP18032S


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