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On the number of overload-induced delay cycles as a function of thickness |
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| Authors: | A J McEvily S Ishihara Y Mutoh |
| Affiliation: | a Department of Material Science and Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT, USA b Department of Mechanical Engineering, Toyama University, Toyama, Japan c Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka, Japan |
| Abstract: | 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. |
| Keywords: | Fatigue crack growth Overloads Effect of thickness Crack closure |
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