An arterial constitutive model accounting for collagen content and cross-linking

Gerhard Holzapfel*, Ray W. Ogden

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

It is apparent from the literature that the density of cross-links in collagenous tissue has a stiffening effect on the mechanical response of the tissue. This paper represents an initial attempt to characterize this effect on the elastic response, specifically in respect of arterial tissue. Two approaches are presented. First, a simple phenomenological continuum model with a cross-link-dependent stiffness is considered, and the influence of the cross-link density on the response in uniaxial tension is illustrated. In the second approach, a 3D model is developed that accounts for the relative orientation and stiffness of (two families of) collagen fibers and cross-links and their coupling using an invariant-based strain-energy function. This is also illustrated for uniaxial tension, and the influence of different cross-link arrangements and material parameters is detailed. Specialization of the model for plane strain is then used to show the effect of the cross-link orientation (relative to the fibers) and cross-link density on the shear stress versus the amount of shear deformation response. The elasticity tensor for the general (3D) case is provided with a view to subsequent finite element implementation.

Original languageEnglish
Article number103682
JournalJournal of the Mechanics and Physics of Solids
Volume136
DOIs
Publication statusPublished - Mar 2020

Keywords

  • Artery elasticity
  • Collagen cross-links
  • Collagen fibers
  • Fibrous tissue

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'An arterial constitutive model accounting for collagen content and cross-linking'. Together they form a unique fingerprint.

Cite this