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인장-전단하중을 받는 IB형 일점 Spot 용접이음재의 파괴역학적 피로강도 평가
손일선(I. S. Sohn),정원석(W. S. Jung),이휘광(H. K. Lee),배동호(D. H. Bae) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.5
According as the member of the automobile body structure have been thinned their thick ~ ness and have become high strength, each part of the body structure has been put more severe stress condition. And, because fatigue strength of the spot welded lap joint is in-fluenced by its geometrical and mechanical factors, welding condition and etc., there needs a Quantitative and systematic evaluation method for them.<br/> In this study, by considering nugget edge of the spot weld part of the IE-type spot welded lap joint under tension-shear load to the ligament crack, fatigue strength of various IE-type spot welded lap joints was estimated with the stress intensity factor (S.I.F) K_Ⅲ which is fracture mechanical parameter. We could find that fatigue strength evaluation of the IE-type spot welded lap joints by K_Ⅲ is more effective than the maximum principal stress ( δ _1max ) at edge of the spot weld part obtained from FEM analysis.<br/>