STP1114

    Normalization: An Experimental Method for Developing J-R Curves

    Published: Jan 1991


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    Abstract

    The method of normalization has been used to develop J-R curves for metallic materials based only on analysis of load and displacement pairs in a ductile fracture test record. This method eliminates the need for crack length monitoring equipment. It not only provides a method for more easily conducting and evaluating J-R curve tests; but it could be useful for tests conducted under special conditions such as under dynamic loading, in restructive facilities such as a hot cell, or even in a facility with limited instrumentation.

    The method uses a normalized deformation curve which has a functional relationship resembling a power law in the beginning and a straight line later. A functional form is proposed to fit this material deformation pattern. This form was used along with the load versus displacement records to evaluate J-R curves for many materials. The results showed that the new method was a more accurate and versatile one for the assessment of the J-R curve. Compared with previous application of this method, the accuracy is remarkably improved in the beginning stages of the J-R curve where a JIc point is determined. The JIc point was analyzed on more than 60 specimens and found to be consistent with methods used in the ASTM test standards.

    Keywords:

    fracture testing, J-R, curve, elastic compliance, normalization, J, Ic, test methods


    Author Information:

    Zhou, Z
    Graduate assistant, graduate assistant, research associate, and professorprofessor, University of TennesseeNational University of Mar Del Plata, Knoxville, TN

    Lee, K
    Graduate assistant, graduate assistant, research associate, and professorprofessor, University of TennesseeNational University of Mar Del Plata, Knoxville, TN

    Herrera, R
    Graduate assistant, graduate assistant, research associate, and professorprofessor, University of TennesseeNational University of Mar Del Plata, Knoxville, TN

    Landes, JD
    Graduate assistant, graduate assistant, research associate, and professorprofessor, University of TennesseeNational University of Mar Del Plata, Knoxville, TN


    Paper ID: STP16846S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP16846S


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