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인장-전단하중을 받는 IB형 일점 Spot용접 이음재의 응력분포와 피로강도평가
정원석(W.S.Jung),구재민(J.M.Koo),손일선(L.S.Sohn),배동호(D.H.Bae) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Stress distribution on the IB-type single spot welded lap joint under tension-shear load were investigated by finite element method. And using the maximum principal stress at nugget edge obtained by FEM analysis, evaluated the fatigue strength of the IB-type spot welded lap joints having various dimensions. From the results, it was found that △P- N_f curves of specimens could be systematically rearranged by the maximum principal stress (?? lmax) at the edge of the nugget.
도로하중조건을 고려한 상용차 Leaf Spring의 피로강도 평가
손일선(I.S. Sohn),배동호(B.H. Bae),정원석(W.S. Jung),정원욱(W.W. Jung),박순철(S.C. Park) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Suspension system of vehicle is directly influenced to ride and handling. Therefore, suspension part<br/> should have enough endurance during its lifetime to protect passenger. Spring is one of major<br/> suspension part of vehicle. Thus, in this paper, a fatigue design method for leaf spring based on road<br/> load response is proposed. At first, strain and acceleration of leaf spring is measured on the proving<br/> ground. And next, the maximum load of leaf spring under driving condition was defined from the<br/> road load response. And leaf spring fatigue test and 3 point bending specimen tests were carried out.<br/> From the above, the maximum load-fatigue life relation of leaf spring was defined, and test results<br/> have good agreement between 3 point bending test result and leaf spring fatigue test. It is expect that<br/> 3 point bending test can verify leaf spring fatigue endurance as well as saving time and cost.