Dynamic Biaxial Tissue Properties of the Human Cadaver Aorta

The authors examine planar aorta tissue biaxial mechanical properties at strain rates likely to be experienced during automotive crashes. The authors also examine whole aorta structural response to longitudinal tension. Twelve thoracic aortas were harvested from human cadavers to conduct 26 tissue-level tests. Descending, peri-isthmic, and ascending region cruciate samples were excised and a new biaxial tissue-testing device tested equibiaxial stretch at two nominal speed levels. True stress calculation was facilitated through inertia-compensated load measurement. Ink dots marked on each sample's center to obtain strain were tracked through regional correlation analysis and high-speed videography. Seven aorta specimens were used to obtain intact thoracic aorta response to longitudinal stretch in a component-level test series. Aortic failure was shown in the transverse direction within the peri-isthmic region. Intima failure occurs prior to adventitia or media failure. Nonlinear behavior is exhibited by aortic tissue. As a complete structure, the aorta can completely transect from 0.221 axial strain and 92 N axial load. Intimal tears can accompany complete transection. Aortic traumatic rupture can be better understood and finite element modeling applications made through study results.

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  • Authors:
    • Shah, Chirag S
    • Hardy, Warren N
    • Mason, Matthew J
    • Yang, King H
    • Van Ee, Chris A
    • Morgan, Richard M
    • Digges, Kennerly
  • Conference:
  • Publication Date: 2006-11

Language

  • English

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Filing Info

  • Accession Number: 01046242
  • Record Type: Publication
  • ISBN: 139780768018295
  • Files: TRIS
  • Created Date: Apr 11 2007 3:19PM