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고강도강의 이종재질 및 두께간 프로젝션용접부 전단파단하중 예측
하상언(Sangun Ha),한기열(Giyeol Han),Siva Prasad Murugan,박영도(Yeongdo Park),이형일(Hyungyil Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
This study aims at predicting shear fracture load of the projection weld part, which is welded with dissimilar materials and thickness of high strength steel. After projection welding experiment, lap shear test was performed to obtain shear fracture load. The nugget size, plate thickness and tensile strength of base material were proportional to the shear fracture load. If both upper and lower welded specimen has high tensile strength and thickness, lower shear fracture load was obtained than predicted value and partial interfacial fracture was occurred. The predicted shear fracture load for interfacial fracture and pullout fracture were suggested through dimensional analysis, and the mean error is 5.4 and 6.4 % respectively compared with the experiment. The failure mode was analyzed with the relationship of plate thickness and the nugget size, and the critical nugget size for pullout fracture was suggested as 5.3 m t using the average thickness of the upper and lower welded specimen.