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유한요소법을 이용한 CO₂ 용접된 H형상 프레임의 열변형 해석
김은겸(Kim E.K.),조원용(CHO W.Y.),고승기(Koh S.K.) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Thermal deformation occurs in the welding of steel structures. The thermal deformation due to the high temperature while welding resulted in poor quality of the manufacturing products. In this research, thermal deformation analysis for CO₂ welding of an H-type frame in a commercial vehicle was performed by using the finite element method. Welding process variables such as welding sequence, clamping position, clamping time, and cooling time were simulated. The calculated deformation shapes were compared to the measured deformation shapes, resulting in a good correlation.
송경진(Song, K.J.),조원용(Cho, W.Y.),김은겸(Kim E.K.),고승기(Koh S.K.) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In order to evaluate the endurance life of a vehicle suspension part, durability analysis and test were performed in this paper. Torque rod is a suspension part to improve the maneuvering stability of the commercial vehicle. The torque rod consisted of rod, end body, bush, and pin. Since the bush was made of rubber, uniaxial and equi-biaxial tests were performed to characterize the stress-strain behavior. Finite element stress analysis of the torque rod was performed to obtain the stress distributions and the critical location of the torque rod. Based on the stress analysis results, durability life was estimated. It was found that the pin groove was the most vulnerable to fatigue cracking, and verified in the durability fatigue tests. The durability life was improved by modifying the pin dimension to meet the specification of the torque rod.
송경진(Song K.J.),김은겸(Kim E.K.),고승기(Koh S.K.) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Failure of an autofrettaged gun tube with a keyway groove at the outside surface occurs due to the fatigue crack initiation and propagation at the groove root. In order to predict the fatigue life of the autofrettaged gun tube, residual stress of the autofrettaged tube using finite element method was evaluated and fatigue properties of the tube steel were obtained from the fatigue tests. Fatigue life of a gun tube by summing the crack initiation and propagation lives was calculated as 2,598 cycles for an 80% autofrettaged tube subjected to a pulsating internal pressure of 424 ㎫.