http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Coupled Finite Element Analysis of Independently Modeled Substructures by Penalty Frame Method
Maenghyo Cho,Won Bae Kim 대한기계학회 2002 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.16 No.10
A penalty frame method is proposed for the coupled analysis of finite elements with independently modeled substructures. Although previously reported hybrid interface method by Aminpour et al (IJNME, Vol 38, 1995) is accurate and reliable, it requires non-conventional special solution algorithm such as multifrontal solver. In present study, an alternative method has been developed using penalty frame constraints, which results in positive symmetric global stiffness matrices. Thus the conventional skyline solver or band solver can be utilized in the solution routine, which makes the present method applicable in the environment of conventional finite element commercial software. Numerical examples show applicability of the present method.<br/>
Maenghyo Cho,Jinho Oh,Jun-Sik Kim,Michel Grediac 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.5
A finite element formulation based on an enhanced first order shear deformation theory is developed to accurately and efficiently predict the behavior of laminated composite and sandwich structures. An enhanced first order shear deformation theory is systematically derived by minimizing the least-squared energy error between the first order shear deformable plate theory and a higher order shear deformable plate theory. In this way, the strain energy of a higher ship between them that is also used to improve the accuracy of predicted streses and displacements. The key feature of the proposed theory is in that it can be implemented to comercial FEM packages by simply changing the input, and the results obtained can be also enhanced by post-processing them via a differential quadrature method. Thus, a pro-posed finite element formulation can be widely used in various application problems. Through numerical examples, the accuracy and robustness of the present formulation are demonstrated.
조맹효(Maenghyo Cho) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Photo responsive polymer is well known for its photo bending feature, which contracts under UV light, and goes back to original shape under visible light. The main reason for this reversible deformation under different kinds of light is due to azobenzene monomer included in the polymer. As azobenzene monomer turns from trans to cis state by photoisomerization, the polymer starts to lose its alignment, and starts shrinking. In order to predict photo deformation of the photo responsive polymer, we propose new modeling approach by connecting three different scale modeling method: quantum mechanics, molecular dynamics, and continuum mechanics. By using the modeling approach, we predict photo deformation of photo responsive polymer at various light input.