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CO₂ 레이저 용접 이종재료강의 피로파괴거동에 관한 연구
한문식(M. S. Han),서정(J. Suh),이제훈(J. H. Lee),김정오(J. O. Kim),전성민(S. M. Jeon) 한국레이저가공학회 2006 한국레이저가공학회지 Vol.9 No.2
In this paper, we investigated the characteristics of fatigue fracture on TB(Tailored Blank) weldment by comparing the fatigue crack propagation characteristics of base metal with those of TB welded sheet used for vehicle body panels. We also investigated the influence of center crack on the fatigue characteristic of laser weld sheet of same thickness. We conducted an experiment on fatigue crack propagation on the base metal specimen of 1.2㎜ thickness of cold-rolled metal sheet(SPCSD) and 2.0㎜ thickness of hot-rolled metal sheet(SAPH440) and 1.2+2.0㎜ TB specimen. We also made an experiment on fatigue crack propagation on 2.0+2.0㎜ and 1.2+1.2㎜ thickness TB specimen which had center crack. The characteristics of fatigue crack growth on the base metal were different from those on 1.2+2.0㎜ thickness TB specimen. The fatigue crack growth rate of the TB welded specimens is slower in low stress intensity factor range (ΔK) region and faster in high ΔK region than that of the base metal specimens. The slant crack angle slightly influenced the crack propagation of the TB specimen of 2.0+2.0㎜ thinkness.
[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.