Type

Journal Article

Authors

M. D. Gilchrist
D B MacManus
J G Murphy
B Pierrat

Subjects

Engineering

Topics
energy incompressible materials implementation new materials community finite element model compressibility finite element fe

Finite element implementation of a new model of slight compressibility for transversely isotropic materials. (2015)

Abstract Modelling transversely isotropic materials in finite strain problems is a complex task in biomechanics, and is usually addressed by using finite element (FE) simulations. The standard method developed to account for the quasi-incompressible nature of soft tissues is to decompose the strain energy function (SEF) into volumetric and deviatoric parts. However, this decomposition is only valid for fully incompressible materials, and its use for slightly compressible materials yields an unphysical response during the simulation of hydrostatic tension/compression of a transversely isotropic material. This paper presents the FE implementation as subroutines of a new volumetric model solving this deficiency in two FE codes: Abaqus and FEBio. This model also has the specificity of restoring the compatibility with small strain theory. The stress and elasticity tensors are first derived for a general SEF. This is followed by a successful convergence check using a particular SEF and a suite of single-element tests showing that this new model does not only correct the hydrostatic deficiency but may also affect stresses during shear tests (Poynting effect) and lateral stretches during uniaxial tests (Poisson's effect). These FE subroutines have numerous applications including the modelling of tendons, ligaments, heart tissue, etc. The biomechanics community should be aware of specificities of the standard model, and the new model should be used when accurate FE results are desired in the case of compressible materials.
Collections Ireland -> University College Dublin -> PubMed

Full list of authors on original publication

M. D. Gilchrist, D B MacManus, J G Murphy, B Pierrat

Experts in our system

1
M. D. Gilchrist
University College Dublin
Total Publications: 172
 
2
David B MacManus
Dublin City University
Total Publications: 9
 
3
Jeremiah G Murphy
Dublin City University
Total Publications: 16
 
4
Baptiste Pierrat
Dublin City University
Total Publications: 8