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Effects by Applying Mode of Single Overload on Propagation Behavior of Fatigue Crack  

송삼홍 (고려대학교 공과대학 기계공학과)
이정무 (고려대학교 공학기술연구소)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.6, 2004 , pp. 109-116 More about this Journal
Abstract
In this study, when variable-amplitude load with various applying mode acts on the pre-crack tip, we examined how fatigue cracks behave. Hence aspects of the deformation caused by changing the applying mode of single overload and propagation behavior of fatigue crack were experimentally examined: What kinds of the deformation would be formed at pre-crack and its tip\ulcorner What aspects of the residual plastic deformation field would be formed in front of a crack\ulcorner How aspects of the plastic zone could be evaluated\ulcorner As applying mode of single overloading changes, the deformation caused by tensile and shear loading variously showed in each applying mode. The different aspects of deformation make influence on propagation behavior of cracks under constant-amplitude fatigue loading after overloading with various modes. We tried to examine the relationship between aspects of deformation and fatigue behavior by comparing the observed deformation at crack and crack propagation behavior obtained from fatigue tests.
Keywords
Single overload; Mixed mode; Applying mode; Shear components; Residual plastic deformation field; Retardation;
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