Three-dimensional variable-node elements based upon CS-FEM for elastic-plastic analysis

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In this paper, variable-node elements (VNEs) based on the cell-based smoothed finite element method (CS-FEM) are proposed with emphasis on their applications for elasto-plastic finite deformation. The formulation of CS-FEM is extended to cover elastic plastic deformations beyond the classical linear theory of elasticity, which has been the major application domain of smoothed finite elements. The finite strain deformations are treated with the aid of the formulation based on the hyperelastic constitutive equation. The volumetric locking originating from the nearly incompressible behavior of elasto-plastic deformations is remedied by relaxing volumetric strain through its mean value. In addition, the existing VNEs limited to linear elastic analysis is extended to analysis of elasto-plastic deformations with the aid of CS-FEM. The comparison with the conventional finite elements and Abaqus demonstrates the effectiveness and accuracy of the present approach.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2015-10
Language
English
Article Type
Article
Keywords

FREE GALERKIN METHOD; FINITE-ELEMENTS; NONMATCHING MESHES; SOLID MECHANICS; MULTIPLICATIVE DECOMPOSITION; QUADRATIC INTERPOLATION; COMPUTATIONAL MECHANICS; SMOOTHED INTEGRATION; INTERFACE ELEMENT; CARVING TECHNIQUE

Citation

COMPUTERS STRUCTURES, v.158, pp.308 - 332

ISSN
0045-7949
DOI
10.1016/j.compstruc.2015.06.005
URI
http://hdl.handle.net/10203/203878
Appears in Collection
ME-Journal Papers(저널논문)
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