Finite Element Implementation of a Structurally-Motivated Constitutive Relation for the Human Abdominal Aortic Wall with and without Aneurysms

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Abstract

The structural integrity of the abdominal aorta is maintained by elastin, collagen, and vascular smooth muscle cells. Changes with age in the structure can lead to develop-ment of aneurysms. This paper presents initial work to capture these changes in a finite element model (FEM) of a structural-ly-motivated anisotropic constitutive relation for the “four fiber family” arterial model. First a 2D implementation is used for benchmarking the FEM implementation to fitted biaxial stress-strain data obtained experimentally from four different groups of persons; 19-29 years, 30-60 years, 61-79 years and abdominal aortic aneurysm (AAA) patients. Next the constitu-tive model is implemented in an anisotropic 3D FEM formula-tion for future simulation of intact aortic geometries. The 2D simulations of the biaxial test experiment show good agree-ment with experimental data with a standard deviation below 0.5% in all cases. The maximum axial and hoop stress in the group of AAA patients was 94.9 kPa (±0.283 kPa) and 94.3 kPa (±0.224 kPa) at maximum stretch ratios of 1.043 and 1.037, respectively. In the 3D simulations, the maximum stress is also found to occur in the AAA patient group, with the highest stress in the circumferential direction (275 kPa). Comparison with an already published isotropic model indicates that the latter underestimates the peak stress significantly. Based on these results it is concluded that the four fiber family model has been successfully implemented into a 3D anisotropic finite element model and that this model can provide more accurate insight into the stress conditions in aortic aneurysms.
Original languageEnglish
Title of host publicationIFMBE Proceedings
EditorsKim Dremstrup, Steve Rees, Morten Ølgaard Jensen
Number of pages280
Volume34
PublisherSpringer
Publication date2011
Pages13-16
ISBN (Print)978-3-642-21682-4
DOIs
Publication statusPublished - 2011
Event15th Nordic-Baltic Conference on Biomedical Engineering and Medical Physics - Aalborg, Denmark
Duration: 14 Jun 201117 Jun 2011
Conference number: 15
http://www.dmts.dk/nbc15/

Conference

Conference15th Nordic-Baltic Conference on Biomedical Engineering and Medical Physics
Number15
CountryDenmark
CityAalborg
Period14/06/201117/06/2011
Internet address

Keywords

  • Anisotropic finite element analysis
  • Four fiber family model
  • Aortic aneurysms
  • Biomechanics

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