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[재료부문] 컴프라이언스를 이용한 보강판재의 피로균열 진전 지연효과 규명
한문식(M.S.Han),오종철(J.C.Oh) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper develops the compliance a approach to the problem of load sharing between a cracked plate and a cover plate used to bridge the crack. The theory is validated by using calculated stress intensity factors for the covered and uncovered cases and by using stop hole method to reduce experimentally observed growth rates to a common base. Calculations are then made on the effect of cover plate width on fatigue crack retardation in order to demonstrate the predictive capability of the technique.
오종철,한문식,서정,이제훈 한국레이저가공학회 2002 한국레이저가공학회지 Vol.5 No.2
As automotive manufacturers have taken a growing more interest in tailored sheet metals for improving the rigidity, weight reduction, crash durability, and cost saving application of the tailored sheet metals to automotive bodies has been resently increased greatly. In this study, we investigated the characteristics of fatigue crack initiation behavior of laser welded sheet use for vehicle body panel. We experimented three types of specimens which were machined of the same base metal : one is 1.4mm thick, another is 1.6mm thick , the others is laser welded of the 1.4mm thick specimen and 1.6mm thick specimen. The results indicated that laser welded metal (1.4+1.6mm) is the best one for fatigue strength and fatigue life.