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정수압 압출을 이용한 Copper-clad Aluminum 복합재 제조에 대한 연구
한운용(Woon Yong Han),이경엽(Kyong Yop Rhee),박훈재(Hoon Jae Park),윤덕재(Duk Jae Yoon),김승수(Seung Soo Kim) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.7
In this work, a copper-clad aluminum composite was fabricated using hot hydrostatic extrusion with various extrusion ratios (8.5, 19, 49) and semi-die angles (30, 45, 60 degree) at a temperature of 320℃. Material characteristics of copper-clad aluminum composites were determined from compression tests and hardness tests. The results showed that for ER of 8.5, the optimum semi-die angle was below or equal to 30 degree and a pressure drop was about 31 %. For ER of 19, the optimum semi-die angle was in the range of 40 to 50 degree and a pressure drop was about 38%. In the case of ER=49, the optimum semi-die angle was above or equal to 60 degree and a pressure drop was about 36%. Compressive yield strength was maximum for ER of 8.5 and semi-die angle of 30 degree and the value of maximum was 155 ㎫. Uniform hardness distribution was obtained as the extrusion ratio increases and the semi-die angle decreases. In the case of ER=8.5 and semi-die angle of 30 degree, the lowest extrusion pressure and the maximum comperssive yield strength was obtained. Therefor, it was concluded that the optimum extrusion condition for fabricated copper-clad aluminum composites under hydrostatic pressure environment was ER of 19 and semi-die angle of 30 degree.
압축하중을 받는 Graphite/Epoxy 복합재의 정수압 환경에서 탄성일인자
조현주(Hyun Joo Cho),신명근(Myung keun Shin),한운용(Woon Yong Han),이경엽(Kyong Yop Rhee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This paper documents the validity of work factor approach to determine compressive fracture toughness of thick graphite/epoxy composites under hydrostatic pressure environment. The elastic work factor was determined under various hydrostatic pressures as a function of delamination length. The results showed that elastic work factor was not affected by hydrostatic pressure and linearly related with delamination length.