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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.
경부선을 주행하는 두종류의 화차 대차프레임의 진동특성시험 및 진동증가 원인파악에 관한 연구
홍재성(J. S. Hong),함영삼(Y. S. Ham),백영남(Y. M. Paik),오택열(T. Y Oh) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
A bogie frame of welded type have some problems. Some end beam has cracked. The cracks have profound influence on the safe freight service. The bogie consists of a frame, suspensions, brakes and wheel sets. Various analyses including a numerical simulation using a finite element method, a static load test, a fatigue test, and running test should be carried out to design the bogie. However cracks have been found at some end beams of the bogies mounted on the freight cars running with the high speed. The cracks of the end beam results in deterioration of the brake performance and the running safety. Numerical simulations and dynamic tests are carried out to figure out the causes of cracks in the existing bogie, and the vibrational characteristics of the improved bogie are compared with those of the conventional one. In this reports, the vibration characteristics were dealed with the most pressing matters for the solution of the end beam crack.