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이방성 이종재 V-노치 균열의 고유벡터계수 해석에 대한 상반일 경로 적분법의 적용
조상봉,노홍래,Jo, Sang-Bong,No, Hong-Rae 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.9
This paper examines that it is possible to apply RWCIM for determining eigenvector coefficients associated with eigenvalues for V-notched cracks in anisotropic dissimilar materials using the complex stress function. To verify the RWCIM algorithm, two tests will be shown. First, it is performed to ascertain whether predicted coefficients associated with eigenvectors are obtained exactly. Second, it makes an examination of the state of stresses for FEM and RWCIM according to a number of eigenvectors at a location far away from the v-notched crack tip.
이방성 이종재 접합계면 균열의 에너지 해방률에 관한 연구
김진광,조상봉,Kim, Jin-Gwang,Jo, Sang-Bong 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.11
The energy release rate for an interface crack in anisotropic dissimilar materials was obtained by the eigenfunction expansion method and also was analyzed numerically by the reciprocal work contour integral method. It was shown that the results for orthotropic dissimilar materials are consistent with the other worker's results.
X방향을 따라 선형적 함수구배인 재료에서 전파하는 균열의 응력장과 변위장
이광호,조상봉,Lee, Gwang-Ho,Jo, Sang-Bong 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.9
Stress and displacement fields for a propagating crack in a functionally gradient material (FGM) which has shear modulus as $\mu$=$\mu$$\_$0/(1+ζX) are derived. The equations of motion in FGM which is nonhomogeneous material are different from those of homogeneous material. The stress intensity factors in stress fields have influence on odd terms of γ$\^$n/2-1/(n=1,3,5,...,) but stress at crack tip only retains term of γ$\^$-1/2/, where the γ is a radius of cylindrical coordinates centered at crack tip. When the FGM constant ζ is zero or γ→0, the fields for FGM are almost same as the those for isotropic material.
전병세 ( Byung Sei Jun ),윤존도 ( Jon Do Yun ),고철호 ( Cheol Ho Go ),조상봉 ( Sang Bong Jo ),곽동현 ( Dong Hyeon Kwak ) 경남대학교 신소재연구소 2009 신소재연구 Vol.21 No.-
본 연구에서는 스택형 고체산화물 연료전지의 전극과 전해질에 대한 특성평가를 실시하였고, 전산 모사하였다. 나노인덴테이션 기법을 이용하여 구성물의 기계적 특성인 경도, 탄성계수를 측정하였고 스택형 고체 산화물 연료전지 실형상에 대하여 모델링을 실행하여 상온에서 750℃까지 승온시의 연료전지내에 형성되는 응력 분포를 전산모사하였다. 그 결과 전해질과 기밀소재 그리고 기밀소재와 연결재의 접합부 끝과 모서리에서 열응력이 최고 200 MPa까지 집중하는 것으로 나타났다. Stack-type solid oxide fuel cell was characterized and simulated by finite element analysis method. The mechanical properties such as hardness and elastic modulus of the fuel cell components were measured by nanoindentation technique. The fuel cell shape was modeled and thermal stress was simulated while heating from the room temperature to 750 degree C. The distribution of thermal stress in the single or stack cell was obtained by the simulation. It was found that the maximum stress was as high as 200 MPa at the joint of the sealant and connector.