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Bubble-enriched smoothed finite element methods for nearly-incompressible solids
C. Lee, , J.S. Hale, Z.A. Taylor, J.-J. Yee, S.P.A. Bordas
Published in
2021
Volume: 127
   
Issue: 2
Pages: 411 - 436
Abstract
This work presents a locking-free smoothed finite element method (S-FEM) for the simulation of soft matter modelled by the equations of quasi-incompressible hyperelasticity. The proposed method overcomes well-known issues of standard finite element methods (FEM) in the incompressible limit: the over-estimation of stiffness and sensitivity to severely distorted meshes. The concepts of cell-based, edge-based and node-based S-FEMs are extended in this paper to three-dimensions. Additionally, a cubic bubble function is utilized to improve accuracy and stability. For the bubble function, an additional displacement degree of freedom is added at the centroid of the element. Several numerical studies are performed demonstrating the stability and validity of the proposed approach. The obtained results are compared with standard FEM and with analytical solutions to show the effectiveness of the method. © This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
About the journal
JournalCMES - Computer Modeling in Engineering and Sciences
Open AccessFalse