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

doi:10.1016/j.jmbbm.2018.03.038

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

J Mech Behav Biomed Mater. 2018 Jun:82:282-290. doi: 10.1016/j.jmbbm.2018.03.038. Epub 2018 Mar 30.

Authors

Marco Amabili¹, Prabakaran Balasubramanian², Ivan Breslavsky², Giovanni Ferrari², Eleonora Tubaldi²

Affiliations

¹ Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Canada H3A 0C3. Electronic address: marco.amabili@mcgill.ca.
² Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Canada H3A 0C3.

PMID: 29627739
DOI: 10.1016/j.jmbbm.2018.03.038

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.

Keywords: Dacron; Dynamic modulus; Graft; Quasi-linear; Relaxation; Viscoelasticity.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Aorta*
Blood Vessel Prosthesis*
Elasticity*
Linear Models
Materials Testing / instrumentation*
Polyethylene Terephthalates*
Tensile Strength
Viscosity

Substances

Polyethylene Terephthalates