On the number of overload-induced delay cycles as a function of thickness

In this paper, a brief review of the experimental facts associated with the crack growth delay period following a tensile overload is given. In the retardation process, crack closure is considered to play a dominant role. A scenario for the two crack opening processes which develop as a fatigue crac...

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Bibliographic Details
Published in:International journal of fatigue 2004-12, Vol.26 (12), p.1311-1319
Main Authors: McEvily, A.J., Ishihara, S., Mutoh, Y.
Format: Article
Language:English
Subjects:
Applied sciences
Crack closure
Effect of thickness
Exact sciences and technology
Fatigue
Fatigue crack growth
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Overloads
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Summary:In this paper, a brief review of the experimental facts associated with the crack growth delay period following a tensile overload is given. In the retardation process, crack closure is considered to play a dominant role. A scenario for the two crack opening processes which develop as a fatigue crack penetrates the overload plastic zone is presented. This scenario deals with the effect of specimen thickness on the crack opening processes. Consideration is given to the delay distance and to the minimum crack growth rate. A method of analysis for the determination of the number of delay cycles following an overload is then developed. Finally the method of analysis is used to compare with recent experimental results.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2004.04.008