Published: Jan 1991
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A method to calculate the deformation theory J, JD, which takes into account the influence of crack growth on J, and a modified version of the J-integral, JM, to allow a large relaxation of restrictions on the amount of crack extension and specimen configuration were proposed by Ernst et al. In this work, simple and nonincremental formulas for JD, JD, and crack extension, based on the single-specimen key-curve method using blunt U-notched specimens are proposed. The methods are applied to the determination of J-R curve for three-point bend type and compact tension type specimens. The accuracy of the methods in the determination of the J-R curves is discussed, emphasizing the differences between J-R curves for JD and JM.
J, -integral, fracture toughness, J, -resistance curve, modified , J, -integral, key curve, J, Ic, test, crack extension, elastic-plastic fracture, test methods
Associate professor, Faculty of Science and Technology, Ryukoku University, Oe-cho Seta, Ohtsu,