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The Characteristics of Fatigue Cracks Emanating from Small Hole Defects Located Opposite Position of the Shaft Cross Section  

Song, Sam-Hong (Dept.of Mechanical Engineering, Korea University)
An, Il-Hyeok (Dept.of Mechanical Engineering, Graduate School of Korea University)
Lee, Jeong-Mu (Dept.of Mechanical Engineering, Graduate School of Korea University)
Publication Information
Journal of the Korean Society for Precision Engineering / v.19, no.10, 2002 , pp. 84-91 More about this Journal
Abstract
The shaft with the circular cross section have symmetric structural combination parts to keep the rotating balance. Hence the crack usually emanate from symmetric combination parts due to the stress concentration of these parts. In this study to estimate the fatigue behavior of symmetric cracks, the fatigue test was performed by using rotary bending tester and the specimen with symmetric defects in circular cross section. From the facts the characteristics of crack initiation and propagation on the symmetric surface cracks in circular cross section was examined. Also we observed the internal crack using oxidation coloring and investigated the fatigue behavior using the relationship between surface crack and internal crack. As a result of fatigue lift of symmetric cracks was reduced to 35% compared to single crack’s. We examined the characteristics of fatigue behavior in element with symmetric cracks using internal crack propagation rate and maximum stress intensity factor range obtained from approximation method.
Keywords
Fatigue Life; Surface Crack; Internal Crack; Fatigue Crack Propagation Rate; Stress Intensity Factor Range; Cycle Ratio;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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