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• W1966304033 endingPage "2078" @default.
• W1966304033 startingPage "2070" @default.
• W1966304033 abstract "Uniaxial and biaxial mechanical properties of purified elastic tissue from the proximal thoracic aorta were studied to understand physiological load distributions within the arterial wall. Stress–strain behaviour was non-linear in uniaxial and inflation tests. Elastic tissue was 40% stiffer in the circumferential direction compared to axial in uniaxial tests and∼100% stiffer in vessels at an axial stretch ratio of 1.2 or 1.3 and inflated to physiological pressure. Poisson’s ratio vθz averaged 0.2 and vzθ increased with circumferential stretch from ∼0.2 to ∼0.4. Axial stretch had little impact on circumferential behaviour. In intact (unpurified) vessels at constant length, axial forces decreased with pressure at low axial stretches but remained constant at higher stretches. Such a constant axial force is characteristic of incrementally isotropic arteries at their in vivo dimensions. In purified elastic tissue, force decreased with pressure at all axial strains, showing no trend towards isotropy. Analysis of the force–length–pressure data indicated a vessel with vθz≈0.2 would stretch axially 2–4% with the cardiac pulse yet maintain constant axial force. We compared the ability of 4 mathematical models to predict the pressure-circumferential stretch behaviour of tethered, purified elastic tissue. Models that assumed isotropy could not predict the stretch at zero pressure. The neo-Hookean model overestimated the non-linearity of the response and two non-linear models underestimated it. A model incorporating contributions from orthogonal fibres captured the non-linearity but not the zero-pressure response. Models incorporating anisotropy and non-linearity should better predict the mechanical behaviour of elastic tissue of the proximal thoracic aorta." @default.
• W1966304033 created "2016-06-24" @default.
• W1966304033 creator A5064298968 @default.
• W1966304033 creator A5064671153 @default.
• W1966304033 creator A5078252782 @default.
• W1966304033 date "2010-08-01" @default.
• W1966304033 modified "2023-10-17" @default.
• W1966304033 title "Mechanical anisotropy of inflated elastic tissue from the pig aorta" @default.
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• W1966304033 doi "https://doi.org/10.1016/j.jbiomech.2010.04.014" @default.
• W1966304033 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20430395" @default.
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