SYMPOSIA PAPER Published: 01 January 1988

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


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.

Author Information

Chen, D
Jiang Nan University, Wuxi, China
Nisitani, H
Faculty of Engineering, Kyushu University, Higashi-ku, Fukuoka, Japan
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Developed by Committee: E08
Pages: 475–488
DOI: 10.1520/STP27226S
ISBN-EB: 978-0-8031-5052-2
ISBN-13: 978-0-8031-0996-4