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Biosci Rep. 2016 Dec 23;36(6). pii: e00431. doi: 10.1042/BSR20160468. Print 2016 Dec.

A computational fluid-structure interaction model to predict the biomechanical properties of the artificial functionally graded aorta.

Author information

1
Atherosclerosis Research Center, Baqiyatallah University of Medical Science, Tehran 15897, Iran.
2
School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16887, Iran miladsalimibani@gmail.com.
3
Department of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran.
4
Basir Eye Health Research Center, Tehran 14186, Iran.

Abstract

In the present study, three layers of the ascending aorta in respect to the time and space at various blood pressures have been simulated. Two well-known commercial finite element (FE) software have used to be able to provide a range of reliable numerical results while independent on the software type. The radial displacement compared with the time as well as the peripheral stress and von Mises stress of the aorta have calculated. The aorta model was validated using the differential quadrature method (DQM) solution and, then, in order to design functionally graded materials (FGMs) with different heterogeneous indexes for the artificial vessel, two different materials have been employed. Fluid-structure interaction (FSI) simulation has been carried out on the FGM and a natural vessel of the human body. The heterogeneous index defines the variation of the length in a function. The blood pressure was considered to be a function of both the time and location. Finally, the response characteristics of functionally graded biomaterials (FGBMs) models with different values of heterogeneous material parameters were determined and compared with the behaviour of a natural vessel. The results showed a very good agreement between the numerical findings of the FGM materials and that of the natural vessel. The findings of the present study may have implications not only to understand the performance of different FGMs in bearing the stress and deformation in comparison with the natural human vessels, but also to provide information for the biomaterials expert to be able to select a suitable material as an implant for the aorta.

KEYWORDS:

artificial vessel; finite element method; functionally graded materials; thick cylinder

PMID:
27836981
PMCID:
PMC5180251
DOI:
10.1042/BSR20160468
[Indexed for MEDLINE]
Free PMC Article

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