An anisotropic inelastic constitutive model to describe stress softening and permanent deformation in arterial tissue
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2012Citation:
Eoghan Maher, Arthur Creane, Caitríona Lally, Daniel J. Kelly, An anisotropic inelastic constitutive model to describe stress softening and permanent deformation in arterial tissue, Journal of the Mechanical Behavior of Biomedical Materials, 12, 2012, 9 19Download Item:
An anisotropic inelastic constitutive model to describe stress softening and permanent deformation in arterial tissue.pdf (Accepted for publication (author's copy) - Peer Reviewed) 2.545Mb
Abstract:
Inelastic phenomena such as softening and unrecoverable inelastic strains induced by loading have been observed experimentally in soft tissues such as arteries. These phenomena need to be accounted for in constitutive models of arterial tissue so that computational models can accurately predict the outcomes of interventional procedures such as balloon angioplasty and stenting that involve non-physiological loading of the tissue. In this study, a novel constitutive model is described that accounts for inelastic effects such as Mullins-type softening and permanent set in a fibre reinforced tissue. The evolution of inelasticity is governed by a set of internal variables. Softening is introduced through a typical continuum damage mechanics approach, while the inelastic residual strains are introduced through an additive split in the stress tensor. Numerical simulations of aorta and carotid arterial tissue subjected to uniaxial testing in the longitudinal, circumferential and axial directions are used to demonstrate the model?s ability to reproduce the anisotropic inelastic behaviour of the tissue. Material parameters derived from best-fits to experimental data are provided to describe these inelastic effects for both aortic and carotid tissue.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
07/RFP/ENMF660
Author's Homepage:
http://people.tcd.ie/kellyd9http://people.tcd.ie/lallyca
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PUBLISHEDType of material:
Journal ArticleSeries/Report no:
Journal of the Mechanical Behavior of Biomedical Materials12
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Full text availableKeywords:
Bioengineering, Arterial tissue, Inelasticity, Mechanical properties, Constitutive mode, Angioplasty, Stent, CoronarySubject (TCD):
Next Generation Medical DevicesDOI:
http://dx.doi.org/10.1016/j.jmbbm.2012.03.001Licences: