Anisotropic fractional viscoelastic constitutive models for human descending thoracic aortas.
J Mech Behav Biomed Mater
; 99: 186-197, 2019 11.
Article
de En
| MEDLINE
| ID: mdl-31362261
ABSTRACT
The generalized fractional Maxwell model, formulated for hyperelastic material within the framework of the nonlinear viscoelasticity with internal variables, is applied to identify viscoelastic constitutive equations from layer-specific experimental data obtained by uniaxial harmonic loading of ex-vivo human descending thoracic aortas. The constitutive parameters are identified by using a genetic algorithm for the optimal fitting of the experimental data. The accuracy of the fitted fractional model is compared to the fitted integer order model with the same number of Maxwell elements. The formulation of an original strain energy density function for anisotropic nonlinear viscoelasticity is introduced and constitutive parameters are obtained from the experiments.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Aorte thoracique
/
Anisotropie
Type d'étude:
Prognostic_studies
Limites:
Humans
Langue:
En
Journal:
J Mech Behav Biomed Mater
Sujet du journal:
ENGENHARIA BIOMEDICA
Année:
2019
Type de document:
Article