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- 저자 : 結城良治 (검색결과 2 건)
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吳煥燮,結城良治 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-
Stress analysis of surface crack tips becomes very important in the recent development of leak-before-break(LBB) concepts. In this study the stress intensity falter k analyzed by considering the fatigue fracfure process which is characterized by interface coalesence and growth. Criteion parameters derived from the stress intensity factor obtained from the boundary element method(BEM) are used to predict the fatigue life. We develop the surface crack growth analysis system using the stress intensity factor data base and also fatigue crack growth law. The results are obtained as some kind of fatigues.
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서창민,북천영부,결성양치 대한기계학회 1983 대한기계학회논문집 Vol.7 No.1
Quantitative analysis have been carried out on the micro-cracks on the surface and into the depth of unnotched smooth mild steel specimen under cyclic stains by rotating bending fatigue tests. Some of the results are; (1) Cracks initiate at the early stage of fatigue life N$_{I}$/ N$_{f}$=10 to 20%, and propagate during the rest of fatigue life. (2) Coalescence of highly crowded small fatigue cracks of random distribution seems to induce the final fracture at higher stress level. (3) The curves of crack initiation and the equal crack length on the graph of stress versus number of cycles are parallel to the S-N curve. (3) The curves of crack initiation and the equal crack length on the graph of stress versus number of cycles are parallel to the S-N curve. (4) The distributions of micro-surface crack length and depth show the composite Weibull distributions which are approximated to two straight lines separated by the value of transient region between stage I and stage II crack.k.k.
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