STP1114: Effect of Residual Stress on the J-R Curve of HY-100 Steel

    Gallant, AD
    Research assistant, associate professor, and professor, Worcester Polytechnic InstituteGeneral Dynamics Corporation, WorcesterGroton, MACT

    Bar-On, I
    Research assistant, associate professor, and professor, Worcester Polytechnic InstituteGeneral Dynamics Corporation, WorcesterGroton, MACT

    Tuler, FR
    Research assistant, associate professor, and professor, Worcester Polytechnic InstituteGeneral Dynamics Corporation, WorcesterGroton, MACT

    Pages: 13    Published: Jan 1991


    Abstract

    Fabrication processes in structural components can result in intended or inadvertent material behavior changes due to plastic deformation and residual stresses. In this study, the effect of a residual stress field caused by prior plastic deformation of a beam in four-point bending on the J-R curve of 12.7 mm (0.5 in.) thick specimens of HY-100 steel was investigated. Specimen blanks were deformed in four-point bending to two different levels of deflection prior to machining the starter notch. The resulting residual stress field in a companion test specimen was measured on side surfaces and through-the-thickness by a multiple exposure X-ray diffraction technique. J-testing was performed in three-point bending on undeformed specimens and the two deformed specimen sets using a modified multiple-specimen technique. A decrease in JQ and tearing modulus, T, with increasing specimen deflection was observed. The decrease in JQ was comparable to that observed previously in uniformly prestrained specimens.

    Keywords:

    elastic-plastic fracture, test methods, J-R, curve, residual stress, steels, prestrained specimens


    Paper ID: STP16859S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP16859S


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