Premium
A generalized orthotropic hyperelastic material model with application to incompressible shells
Author(s) -
Itskov Mikhail
Publication year - 2001
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.86
Subject(s) - orthotropic material , hyperelastic material , constitutive equation , finite element method , isotropy , tensor (intrinsic definition) , eigenvalues and eigenvectors , shell (structure) , mathematics , compressibility , helmholtz free energy , mathematical analysis , geometry , physics , structural engineering , mechanics , materials science , engineering , quantum mechanics , composite material
In the present paper a new orthotropic hyperelastic constitutive model is proposed which can be applied to the numerical simulation of a wide range of anisotropic materials and particularly biological soft tissues. The model represents a non‐linear extension of the orthotropic St. Venant–Kirchhoff material and is described in each principal material direction by an arbitrary isotropic tensor function coupled with the corresponding structural tensor. In the special case of isotropy this constitutive formulation reduces to the Valanis–Landel hypothesis and may therefore be considered as its generalization to the case of orthotropy. Constitutive relations and tangent moduli of the model are expressed in terms of eigenvalue bases of the right Cauchy–Green tensor C and obtained for the case of distinct and coinciding eigenvalues as well. For the analysis of shells the model is then coupled with a six (five in incompressible case) parametric shell kinematics able to deal with large strains as well as finite rotations. The application of the developed finite shell element is finally illustrated by a number of numerical examples. Copyright © 2001 John Wiley & Sons, Ltd.