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용접 비드 형상을 이용한 용접 시편의 피로수명 예측 연구
김재훈,구병춘 한국철도학회 2004 한국철도학회논문집 Vol.7 No.2
This study investigates the fatigue life estimation of butt weld specimen for the railway vehicle by examining butt weld bead profiles. The butt weld beads, which are welded by semi-robot method, have non-uniform bead profiles described by θ, ρ and h. The stress concentration factors, Kt, are changed by different θ, ρ and h form 1.395 to 2.863. Hence, the sensitivity of Kt is changed by each θ, ρ and h. As θ becomes lower and ρ and h become higher, Kt increases. The fatigue life can be estimated very closely for the AAY specimens without residual stress using only butt weld bead profiles. But, for the AAN specimens with residual stress, the fatigue life must be estimated by considering both the weld bead profiles and the residual stress data.
용접 비드 형상을 이용한 용접 시편의 피로수명 예측 연구
김재훈(Jae-Hoon Kim),구병춘(Byeong-Choon Goo) 한국철도학회 2004 철도저널 Vol.7 No.2
This study investigates the fatigue life estimation of butt weld specimen for the railway vehicle by examining butt weld bead profiles. The butt weld beads, which are welded by semi-robot method, have non-uniform bead profiles described by θ, ρ and h. The stress concentration factors, Kt, are changed by different θ, ρ and h form 1.395 to 2.863. Hence, the sensitivity of Kt is changed by each θ, ρ and h. As θ becomes lower and ρ and h become higher, Kt increases. The fatigue life can be estimated very closely for the AAY specimens without residual stress using only butt weld bead profiles. But, for the AAN specimens with residual stress, the fatigue life must be estimated by considering both the weld bead profiles and the residual stress data.
SM 490A 재질 용접시편 피로수명 및 스트레인 게이지를 통한 균열발생 및 진전 연구
김재훈(Jae-Hoon Kim),구병춘(Byeong-Choon Goo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study investigates the fatigue lives of SM490A material (base metal) specimens and weld specimens, which are made same material and weld method for the railway vehicle. These fatigue lives have a difference; the fatigue lives of weld specimen are shorter than it of base metal. We measured the strains on the weld positions of the specimens during the fatigue test for investigation of crack initiation and crack growth. In these results, we could find the crack initiation position on weld bead and know the history of crack growth. Also we knew that the changes of the strain affect the change of surface fracture morphology and surface roughness.