Publication

Soft-tissue viscoelasticity: extension to anisotropy and finite element implementation

Dominique Pioletti, Arne Christian Vogel
2009
Student Projects

Abstract

Physiological loading result to finite and finite rate of deformations of soft tissues such as ligament, tendons, and the annulus fibrosus of the intervertebral disc. Under these conditions, these soft tissues exhibit viscoelastic effects such as strain-stiffening, creep and relaxation that have important implications in the stability of joints. Although the effects are significant, viscoelasticity has, however, only recently been taken into account in biomechanical studies. We have developed a versatile viscoelastic model for soft tissues that requires some extensions. The model is currently limited to isotropy. Therefore, this project consists in extending and implementing (ABAQUS) soft tissue anisotropy usually found in soft tissues.

Official source

https://infoscience.epfl.ch/entities/publication/2dd36d57-362e-4e60-a24b-ad9fe16ebe6f

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Dominique Pioletti, Arne Christian Vogel
2009
Student Projects

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2dd36d57-362e-4e60-a24b-ad9fe16ebe6f

About this result

Related concepts (32)

Viscoelasticity

In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials, like water, resist shear flow and strain linearly with time when a stress is applied. Elastic materials strain when stretched and immediately return to their original state once the stress is removed. Viscoelastic materials have elements of both of these properties and, as such, exhibit time-dependent strain.

Finite element method

The finite element method (FEM) is a popular method for numerically solving differential equations arising in engineering and mathematical modeling. Typical problem areas of interest include the traditional fields of structural analysis, heat transfer, fluid flow, mass transport, and electromagnetic potential. The FEM is a general numerical method for solving partial differential equations in two or three space variables (i.e., some boundary value problems).

Soft tissue

Soft tissue is all the tissue in the body that is not hardened by the processes of ossification or calcification such as bones and teeth. Soft tissue connects, surrounds or supports internal organs and bones, and includes muscle, tendons, ligaments, fat, fibrous tissue, lymph and blood vessels, fasciae, and synovial membranes. It is sometimes defined by what it is not – such as "nonepithelial, extraskeletal mesenchyme exclusive of the reticuloendothelial system and glia".

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Soft-tissue viscoelasticity: extension to anisotropy and finite element implementation

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