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발포재가 내장된 직조 탄소섬유 샌드위치 구조의 미소 유한요소 모델링에 관한 연구
장승환(Seung Hwan Chang),전성식(Seong Sik Cheon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, a modified unit cell model was employed to characterise the mechanical behaviors of the metallic foam, which can be used for the core material of sandwich structures. Also, a representative unit volume (RUV) FE model was introduced to simulate thermoforming process of carbon fabric-metallic foam sandwich structures. Thermoforming simulations, which capture crimp angles and amplitude changes of carbon fabric with respect to different operational pressure were conducted with the help of RUV FE model. Changed shapes of tow structure after thermoforming were rigorously reflected in the two dimensional models to determine mechanical properties of skin parts, i.e. carbon fabric composites after thermoforming.
나노조작기를 이용한 다중벽 탄소나노튜브의 인장 물성 평가
권성환(Sung Hwan Kwon),장훈식(Hoon-Sik Jang),백운봉(Un-Bong Baek),이윤희(Yun-Hee Lee),박종서(Jong Seo Park),남승훈(Seung Hoon Nahm),김엄기(Amkee Kim),전성식(Seung-Sik Cheon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Tensile test of multi walled carbon nanotube (MWCNT) was performed in the scanning electron microscope (SEM). The MWCNT used in this experiments was fabricated by means of arc-discharge. And the strength properties of MWCNT were evaluated. The force sensor was cantilever type and was mounted on the nano-manipulator. The nano-manipulator was controlled by personal computer. An individual MWCNT was attached on the rigid support and force sensor by electron beam exposure and then tensile test was performed. After tensile test, the fractured area of a MWCNT was also observed by transmission electron microscope (TEM). From the TEM result, fractured cross-sectional area was estimated and elastic modulus of a MWCNT could be calculated. The tensile strength of a MWCNT was 41.01 ㎬ and the elastic modulus of a MWCNT was obtained at 0.98 T㎩.