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Graphite/Epoxy 적층복합재의 층간파괴 향상을 위한 프리프레그의 전처리 연구
이경엽(Rhee K. Y.),김민호(Kim M. H.),백영남(Paik Y. N.),이위로(Lee W. R.) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this study, the graphite/epoxy prepregs were surface-treated using O² plasma, and optimal treatment time was determined measuring the contact angle. Interlaminar toughness of surface-treated graphite/epoxy composites was compared with that of regular (untreated) graphite/epoxy composites. The results showed that the contact angle was a minimum when treated for 30 minutes. The interlaminar toughness of surface-treated case was improved about 20% compared with that of regular case.
홍재성(J. S. Hong),함영삼(Y. S. Ham),백영남(Y. N Paik),이경엽(K. Y. Lee),김민호(M. H. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
There are about 13,000 freight cars in Korea. The holding amount of the freight cars are many more than the other types of cars. But the bogie structure has many friction parts, so three are many hold-ups for the maintenance problem on the spot. As seen in Fig. 1 friction parts are organized of 30 parts in case of welding structure bogie. Especially left-right positions of the axle box have severe problems for the wear, they occurs the reduction of maintenance period, a lowering of the running safety. Generally the thickness of wear plate is 4.5mm and attached to bogie by way of welding method. At the running situation the friction occurs in wear plate each other. Namely the role of the wear plate reduce the load from the carbody. So we need the wear plate for low-wearing, adequate friction power.