Biomechanics and Modeling in Mechanobiology

, Volume 13, Issue 4, pp 783–799 | Cite as

Axial prestretch and circumferential distensibility in biomechanics of abdominal aorta

  • Lukáš Horný
  • Marek Netušil
  • Tereza Voňavková
Original Paper

Abstract

Elastic arteries are significantly prestretched in an axial direction. This property minimises axial deformations during pressure cycle. Ageing-induced changes in arterial biomechanics, among others, are manifested via a marked decrease in the prestretch. Although this fact is well known, little attention has been paid to the effect of decreased prestretch on mechanical response. 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 the 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 was 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. The simulation also suggested the significant effect of the axial prestretch on the variation of axial stress in the pressure cycle. Finally, the obtained results are in accordance with the hypothesis that circumferential-to-axial stiffness ratio is the quantity relatively constant within this cycle.

Keywords

Abdominal aorta Ageing Constitutive modelling Distensibility Elasticity tensor Residual stress 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Lukáš Horný
    • 1
  • Marek Netušil
    • 2
  • Tereza Voňavková
    • 1
  1. 1.Faculty of Mechanical EngineeringCzech Technical University in PraguePragueCzech Republic
  2. 2.Faculty of Mathematics and PhysicsCharles University in PraguePragueCzech Republic

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