Modelling the mechanical response of two-layered artery using thermomechanical analogy approach

Janez Urevc (Author), Vojko Flis (Author), Milan Brumen (Author), Boris Štok (Author)

Abstract

This work deals with the prediction of the mechanical response of a section of a human common carotid artery (CCA). The arterial residual stress state is accounted for using the thermomechanical analogy (TMA) approach, which is applied in this work to model the mechanical response of a two-layered arterial structure. The starting point to model the arterial residual stress state is normally the cut-open section, which is in the case of patient-specific artery not known. With TMA approach, however, instead of using the arterial zero-stress cut-open configuration to predict the arterial residual stress state, a thermomechanical model of the CCA is considered with its zero-stress geometry defined based on the actual CCA in vivo configuration. The approximation to the CCA residual stress state is then obtained by exposing the auxiliary CCA model to a volumetric deformation, enforced via adequate thermal dilatations. The approach is validated on a circular arterial model and by predicting the CCA cut-open zero-stress state.

Keywords

common carotid artery;finite element method;residual stresses;thermomechanics;

Data

Language:	English
Year of publishing:	2017
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	531:616.133:519.6(045)
COBISS:	15724059
ISSN:	1330-3651
Views:	57
Downloads:	19
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Croatian
Secondary title:	Modeliranje mehaničkog odziva dvoslojne stijenke arterije uporabom termo-mehaničke analogije
Secondary abstract:	Ovaj rad obrađuje problem predviđanja mehaničkog odziva dijela zajedničke arterije glave (ZAG). Zaostala naprezanja u arteriji uzeta su u obzir uporabom termo-mehaničke analogije (TMA), koja se primjenjuje u ovom radu za potrebe modeliranja mehaničkog odziva dvoslojne strukture stijenke arterije. Obično se modeliranju zaostalih naprezanja u arteriji pristupi s uzdužno otvorenim modelom arterije, tzv. cut-open section, koji u slučaju bolesnikove arterije nije poznat. S TMA pristupom, umjesto uporabe uzdužno prerezane stijenke arterije, koja doduše osigurava početno stanje bez zaostalih naprezanja, u termo-mehaničkom modelu zajedničke arterije glave također je postignuto početno stanje bez zaostalih naprezanja ali na modelu stvarne, in vivo arterije. Tim pristupom, zaostalo naprezanje u ZAG aproksimirano je podvrgavanjem ZAG modela obujamskom deformacijom, t.j. primjenom odgovarajućih termičkih dilatacija. Takav pristup potvrđen je na modelu arterije kružnog presjeka i postizanjem stanja bez naprezanja u slučaju uzdužnog rezanja stijenke.
Secondary keywords:	karotidna arterija;metoda končnih elementov;zaostale napetosti;termomehanika;
Type (COBISS):	Article
Source comment:	KLJUČNE BESEDE: karotidna arterija, metoda končnih elementov, zaostale napetosti, termomehanika
Pages:	str. 1369-1384
Volume:	ǂVol. ǂ24
Issue:	ǂno. ǂ5
Chronology:	2017
DOI:	10.17559/TV-20160831205711
ID:	24910769