J-integral characterization of fatigue crack growth
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This paper extends fracture mechanics analyses of fatigue crack growth to the J-integral method of analysis. Compact tension specimens of A533B steel and 2024-T351 aluminum were subjected to cyclic loading and fatigue crack growth rates obtained. The values of cyclic J, that is [delta] J, were evaluated from the area under load-deflection curves. Several predetermined definitions were used in the evaluation of [delta] J in an attempt to investigate the effect of load ratio and the crack closure phenomenon. The results show agreement between values of [delta] J calculated from the area under load deflection curves and those obtained from the functional relationship between J and K (the stress intensity factor). Also another parameter, the effective cyclic J, [delta] Jeff (which accounts for crack closure effect), turns out to be a very significant finding for the relationship between the fatigue crack orowth rate (da/dN) and this quantity is independent of stress ratio and resulted in a linear relationship within the range of da/dN investigated. It is hoped that the results of this paper will provide further insights into the limitations or applicability of the J-integral concept especially as applied to cyclic loading in the elastic-plastic regime.
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