The improved element-free Galerkin method for two-dimensional elastodynamics problems |
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Authors: | Zan Zhang S.Y. Hao K.M. Liew Y.M. Cheng |
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Affiliation: | 1. School of Science, East China University of Science and Technology, Shanghai 200237, China;2. School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou 730070, China;3. Department of Civil and Architectural Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region;4. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China |
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Abstract: | In this paper, we derive an improved element-free Galerkin (IEFG) method for two-dimensional linear elastodynamics by employing the improved moving least-squares (IMLS) approximation. In comparison with the conventional moving least-squares (MLS) approximation function, the algebraic equation system in IMLS approximation is well-conditioned. It can be solved without having to derive the inverse matrix. Thus the IEFG method may result in a higher computing speed. In the IEFG method for two-dimensional linear elastodynamics, we employed the Galerkin weak form to derive the discretized system equations, and the Newmark time integration method for the time history analyses. In the modeling process, the penalty method is used to impose the essential boundary conditions to obtain the corresponding formulae of the IEFG method for two-dimensional elastodynamics. The numerical studies illustrated that the IEFG method is efficient by comparing it with the analytical method and the finite element method. |
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Keywords: | Weighted orthogonal function Improved moving least squares (IMLS) approximation Improved element-free Galerkin (IEFG) method Elastodynamics Penalty method |
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