Axial prestretch and circumferential distensibility in biomechanics of abdominal aorta
Type of document
článek v časopisejournal article
Peer-reviewed
acceptedVersion
Author
Horný L.
Netušil M.
Voňavková T.
Rights
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Show full item recordAbstract
Our study presents the results of an
analytical simulation of the inflation-extension behaviour of the human abdominal aorta
treated as nonlinear, anisotropic, prestrained thin-walled as well as thick-walled tube
with closed ends. The constitutive parameters and geometries for 17 aortas adopted
from the literature were supplemented with initial axial prestretches obtained from the
statistics of 365 autopsy measurements. For each aorta, the inflation-extension
response was calculated three-times: with expected value of the initial prestretch and
with the upper and lower confidence limit of the initial prestretch derived from the
statistics. This approach enabled age-related trends to be evaluated bearing in mind
the uncertainty in the prestretch. Despite significantly decreased longitudinal
prestretch with age, the biomechanical response of human abdominal aorta changes
substantially depending on the initial axial stretch used. In particular, substituting the
upper limit of initial prestretch gave mechanical responses which can be characterised
by (1) low variation in axial stretch, and (2) high circumferential distensibility during
pressurisation, in contrast to the responses obtained for their weakly prestretched
counterparts.
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