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    Analytical and Experimental Study of Crack Closure Behavior Based on an S-Shaped Unloading Curve

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    Based on the S-shaped unloading hysteresis curve a new method for determining the crack closure has been developed in which the plastic deformation near the crack tip is taken into consideration. The crack growth rate can be expressed uniquely by the effective stress intensity range, ΔKeffop = KmaxKop or ΔKeffcl = KmaxKcl, which is independent of the stress ratio and the loading history. The tip of a nonpropagating crack does not open even under the maximum tensile load during one loading cycle. The measured values of the crack opening ratios UopKeffop/Kmax) and UclKeffcl/Kmax) of a steadily propagating crack are mainly controlled by Kmax and the stress ratio R.


    fatigue, fatigue crack propagation, crack closure, unloading elastic compliance method, effective stress intensity factor, nonpropagating cracks, carbon steels

    Author Information:

    Chen, D
    Associate professor, Jiang Nan University, Wuxi,

    Nisitani, H
    Professor, Faculty of Engineering, Kyushu University, Higashi-ku, Fukuoka,

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP27226S