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이광현(K. .H. Lee),이상욱(S. W. Lee) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
Diaphragm valve is that it controls the fluid flow by deforming generally the dome shaped rubber diaphragm in the valve. The rubber diaphragm is severely deformed while the valve is opening or closing. This deformation affects the working force, sealing performance and durability of the valve. In this paper, the configuration of rubber diaphragm is set to a part of a sphere, a long ellipsoid and a short ellipsoid so that how these shapes can affect the working force, sealing performance and durability of the valve is evaluated by analyzing with a FE code. The rubber diaphragm is modeled with Mooney-Rivilin. It will be concluded that which shape is more effective by comparing the three configurations in view of the working force while closing, sealing performance when closed and the durability which is evaluated by the peak stress near the rim of the rubber diaphragm.
자동차 범퍼빔 경량화를 위한 레이저 용접 블랭크의 적용
서정(J.Suh),한유희(Y.H.Han),김정오(J.O.Kim),이문용(M.Y.Lee),이광현(K.H.Lee),김태일(T.I.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this paper. weldability and formability of Tailored-Blank (TB) and the structural impact testing of bump beam were investigated to apply TB to automobile bumper beam. The optimal CO₂ laser welding condition for TB of SPEC and SPRC steel plates with different thicknesses was obtained. Before welding, the cross section of butt joint was prepared only by shearing without milling process. Real type bump beam was produced by two kind of forming processes such as roll-forming and press-forming, and the good formability of TB was obtained. Impact test results of bump by using pendulum and barrier were satisfied the impact regulation of bump. Finally, It may be confirmed that laser welded TB is well-balanced material in both weight reduction and production cost of automobile bump.<br/>