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심대성,김만태,염효원,임동민,김영진,엄원섭,Shim, Daisung,Kim, Mantae,Yeom, Hyowon,Im, Dongmin,Kim, Youngjin,Uhm, Wonseop 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.6
This is a study for the improvement of the defected elevator spar in operating aircraft. The elevator spar web holes were analyzed to find out the cause of the cracks. The fatigue striations were observed and the cracks occurred by the repetitive stresses during the elevator works. Also the outboard connection structure of the elevator and horizontal stabilizer was more weak shape than the inboard. The design changes were recommended and the analyses were performed to verify the improvement of the changed shapes.
심대성,장덕현,박차환,김정훈,Shim, Daisung,Jang, Deakhyeon,Park, Chahwan,Kim, Jounghun 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.4
This is a study for the improvement of the fractured lug structure that connects the landing gear to the fuselage of the aircraft using the composite leaf spring landing gear. The lug surface was analyzed to find out the cause of fracture. The lug was destroyed by the crack initiation and propagation under the repeated stresses. The frictional wears of the lug structure were proceeded and that affected adversely to the crack. Also, the square protrusion of the lug has a weak shape to bring about stress concentration. The design changes were conducted and the test was performed to verify changed design results.