Viscoelastic characterization of woven Dacron for aortic grafts by using direction-dependent quasi-linear viscoelasticity

Marco Amabili, Prabakaran Balasubramanian, Ivan Breslavsky, Giovanni Ferrari, Eleonora Tubaldi

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In case of direction-dependent viscoelasticity, a simplified formulation of the three-dimensional quasi-linear viscoelasticity has been obtained manipulating the original Fung equation. The experimental characterization of the static hyperelastic behaviour, the relaxation, the dynamic modulus and the loss factor of woven Dacron from a commercial aortic prosthesis has been performed. An 11% difference of the reduced relaxation (after infinite time) between axial and circumferential directions has been observed for the woven Dacron. A very large increase in stiffness is obtained in case of harmonic loading with respect to the static loading. These findings are particularly relevant for dynamic modelling of currently used aortic grafts.

Original languageEnglish (US)
Pages (from-to)282-290
Number of pages9
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume82
DOIs
StatePublished - Jun 2018
Externally publishedYes

Keywords

  • Dacron
  • Dynamic modulus
  • Graft
  • Quasi-linear
  • Relaxation
  • Viscoelasticity

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

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