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초기 곡률이 부여된 쌍 안정 복합재의 형상 전환을 위한 하중 조건 해석
이종구(Jonggu Lee),류정현(Junghyun Ryu),김승원(Seung-Won Kim),고제성(Je-Sung Koh),조규진(Jyu-Jin Cho),조맹효(Maenghyo cho) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Bi-stable composite which is cured on flat tool-plate has same curvature values and strain potentials level for each stable states. As a result, loading conditions to induce snap-through behavior from one stable state to another are same. However, if we induce initial curvature to bi-stable composite, not only final curvature values, but also loading conditions are affected because strain energy of bi-stable composite is a function of initial curvature. Therefore, if one configuration of bi-stable composite is needed to be stiff but the other configuration is needed to be flexible. This requirement can be satisfied by changing the initial curvature value. In this research, we investigate loading condition to induce snap-through behavior of bi-stable composite with respect to change of initial curvature.
생체 모방 기술에 응용 가능한 형상기억합금 선이 삽입된 복합재 해석
이혁(Hyeok Lee),이종구(Jonggu Lee),류정현(Junghyun Ryu),송성혁(Sung-Hyuk Song),안성훈(Sung-Hoon An),조맹효(Maenghyo Cho) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this study, to imitate turtle’s wing, SMA(Shape memory alloy) embedded composite that has various stacking sequence is used. Bending and twisting deformation is induced by large phase transformation strain and recovering stress of SMA. In order to predict the deformation of composite, finite element method and analytical method based on the classical laminated plate theory are used. To represent the behavior of SMA, Lagoudas model is used. From this study, the bending curvature and twisting angle is estimated with respect to various stacking sequences and angles. The result obtained by analytical method shows a good agreement with the result obtained by FEM.
직교 적층 쌍안정 복합재의 원통형상 형판을 이용한 곡률 제어 및 해석
류정현(Junghyun Ryu),이종구(Jonggu Lee),김승원(Seung-Won Kim),고제성(Je-Sung Koh),조규진(Kyu-Jin Cho),조맹효(Maenghyo Cho) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Curing the bi-stable plate on the curved tool-plate is an attractive process in order to tailor the final curvature of unsymmetric laminates since there is no extra complicated process needed. Especially, in the case of cross-ply laminates, cylinder shape tool-plate shows additional advantages for curvature tailoring because final cured curvatures are controllable. Green-Lagrangian nonlinear strain field is assumed, which is based on Kirchoff-Love thin plate assumption. Unknown coefficients in the strain field are determined by minimizing the strain energy. We propose the explicit approximation method based on the fact that final shape of unsymmetric laminate is cylinder. The proposed approximation solutions are compared with the results of conventional strain energy minimization method and experiments for verification.