TY - JOUR
T1 - Strain smoothing for compressible and nearly-incompressible finite elasticity
AU - Lee, Chang Kye
AU - Angela Mihai, L.
AU - Hale, Jack S.
AU - Kerfriden, Pierre
AU - Bordas, Stéphane P.A.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - We present a robust and efficient form of the smoothed finite element method (S-FEM) to simulate hyperelastic bodies with compressible and nearly-incompressible neo-Hookean behaviour. The resulting method is stable, free from volumetric locking and robust on highly distorted meshes. To ensure inf-sup stability of our method we add a cubic bubble function to each element. The weak form for the smoothed hyperelastic problem is derived analogously to that of smoothed linear elastic problem. Smoothed strains and smoothed deformation gradients are evaluated on sub-domains selected by either edge information (edge-based S-FEM, ES-FEM) or nodal information (node-based S-FEM, NS-FEM). Numerical examples are shown that demonstrate the efficiency and reliability of the proposed approach in the nearly-incompressible limit and on highly distorted meshes. We conclude that, strain smoothing is at least as accurate and stable, as the MINI element, for an equivalent problem size.
AB - We present a robust and efficient form of the smoothed finite element method (S-FEM) to simulate hyperelastic bodies with compressible and nearly-incompressible neo-Hookean behaviour. The resulting method is stable, free from volumetric locking and robust on highly distorted meshes. To ensure inf-sup stability of our method we add a cubic bubble function to each element. The weak form for the smoothed hyperelastic problem is derived analogously to that of smoothed linear elastic problem. Smoothed strains and smoothed deformation gradients are evaluated on sub-domains selected by either edge information (edge-based S-FEM, ES-FEM) or nodal information (node-based S-FEM, NS-FEM). Numerical examples are shown that demonstrate the efficiency and reliability of the proposed approach in the nearly-incompressible limit and on highly distorted meshes. We conclude that, strain smoothing is at least as accurate and stable, as the MINI element, for an equivalent problem size.
KW - Large deformation
KW - Mesh distortion sensitivity
KW - Near-incompressibility
KW - Smoothed finite element method (S-FEM)
KW - Strain smoothing
KW - Volumetric locking
UR - http://www.scopus.com/inward/record.url?scp=85010703445&partnerID=8YFLogxK
U2 - 10.1016/j.compstruc.2016.05.004
DO - 10.1016/j.compstruc.2016.05.004
M3 - Article
AN - SCOPUS:85010703445
SN - 0045-7949
VL - 182
SP - 540
EP - 555
JO - Computers and Structures
JF - Computers and Structures
ER -