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Element‐free Galerkin methods
Author(s) -
Belytschko T.,
Lu Y. Y.,
Gu L.
Publication year - 1994
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1620370205
Subject(s) - galerkin method , finite element method , mathematics , moving least squares , rate of convergence , least squares function approximation , mathematical analysis , convergence (economics) , weight function , elasticity (physics) , key (lock) , computer science , physics , statistics , computer security , estimator , economics , thermodynamics , economic growth
An element‐free Galerkin method which is applicable to arbitrary shapes but requires only nodal data is applied to elasticity and heat conduction problems. In this method, moving least‐squares interpolants are used to construct the trial and test functions for the variational principle (weak form); the dependent variable and its gradient are continuous in the entire domain. In contrast to an earlier formulation by Nayroles and coworkers, certain key differences are introduced in the implementation to increase its accuracy. The numerical examples in this paper show that with these modifications, the method does not exhibit any volumetric locking, the rate of convergence can exceed that of finite elements significantly and a high resolution of localized steep gradients can be achieved. The moving least‐squares interpolants and the choices of the weight function are also discussed in this paper.