http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Strain smoothing 기법을 이용한 비압축성 초탄성물질의 동적해석
이창계(Lee, Changkye),김동건(Kim, Dong-Keon),Zeike A. Taylor 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.1
This work aims to propose the nonlinear dynamic analysis using the strain the smoothing approach. Lower-order triangular and tetrahedral elements are widely used since complex geometries can be easily generated. However, such elements often face the over-estimation of stiffness (often called locking) when problems are involved non-linear large deformations, and they also suffer from severely distorted meshes. In this paper, we introduce the strain-smoothed approach (or smoothed finite element method) to handle such weaknesses of linear triangular and tetrahedral elements, and propose the strain-smoothed explicit dynamic analysis algorithm. Numerical tests show following results: the proposed algorithm efficiently avoids deleterious locking, and at the same lever of accuracy strain-smoothing requires less number of elements than FEM.
이상진(Lee Sang-Jin),이창계(Lee Chang-Kye) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.7
This study proposes a topology optimization technique using meshless method for planer structures. The meshless method is developed to complement the weak point of finite element (FE) method in case of crack propagation problems which generally need the regeneration of FE mesh when cracks occur. It has been considered as a very attractive computational method since it does not need mesh generation during the analysis. We adopt the radial point interpolation method (RPIM) which uses the radial basis function (RBF). It has great advantages since it is stable and robust for arbitrary nodal distributions. So far, there is a few application of new meshless method into the structural design optimization. Therefore, we here apply the meshless method into structural topology optimization problem. The hard kill method based on fully stressed design technique is consistently combined with RPIM meshless method. In order to demonstrate the accuracy of the proposed topology optimization technique, several benchmark tests are tackled not only to investigate the accuracy of the adopted meshless method but also the performance of new topology optimization process. From numerical results, it is found to be that the proposed topology optimization technique very simple and effective to produce the optimum topologies of plane structures.