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Deformation behaviour at the tip of a physically short fatigue crack due to a single overload
Faculty
Not Specified
Year:
1999
Type of Publication:
Article
Pages:
145-151
Authors:
Sallam, HEM, HAMMOUDA, MMI, AHMAD, SSE, Sherbini, AS
Journal:
FATIGUE \& FRACTURE OF ENGINEERING MATERIALS \& STRUCTURES BLACKWELL SCIENCE LTD
Volume:
22
Research Area:
Engineering; Materials Science
ISSN
ISI:000080123900006
Keywords :
fatigue crack growth, physically short crack, single overload, finite element analysis, crack tip deformation
Abstract:
A two-dimensional elastic-plastic finite element analysis was utilized to investigate the transition behaviour of a physically short fatigue crack following the application of a single overload cycle. The deformation accommodated at the tip of a crack artificially advancing with a fully reversed load was considered. The development of the cyclic crack tip opening displacement was computed and then modelled to include the effects of the stress level of the base cycles, overload pattern and crack length at which the transient cycle was applied. The cyclic crack tip opening displacement was initially of a relatively high value. It decreased and then increased to match the behaviour under the base load cycles. The extent and location of both the minimum and matching points were dependent on the overload crack length and the stress compared with the material's yield stress. In the case of the yield stress being exceeded by the overload, the minimum and the-return-to-normality paints are identical. A previously developed crack tip deformation parameter was invoked to predict relevant experimental fatigue growth rates of short cracks reported in the literature.
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