Age Dependency of the Biaxial Biomechanical Behavior of Human Abdominal Aorta

[+] Author and Article Information
Jonathan P. Vande Geest

Department of Surgery and Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15219

Michael S. Sacks

Department of Bioengineering, Division of Vascular Surgery, and McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219

David A. Vorp

Department of Surgery, Division of Vascular Surgery, Department of Bioengineering, and McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219

J Biomech Eng 126(6), 815-822 (Feb 04, 2005) (8 pages) doi:10.1115/1.1824121 History: Revised August 26, 2003; Revised June 25, 2004; Online February 04, 2005
Copyright © 2004 by ASME
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Tension ratio protocol for all biaxial tests
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Second-Piola Kirchhoff stress versus Green strain for representative Group 1 (top; specimen 3, 23 years old), Group 2 (middle; specimen 12, 50 years old) and Group 3 (bottom; specimen 16, 71 years old). The legend signifies tension ration protocol Tθθ:TLL.
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Comparisons of longitudinal and circumferential peak stretch values for all age groups. The corresponding longitudinal and circumferential peak stretches were significantly smaller for Groups 2 and 3 with respect to Group 1 (p<0.001)
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Areal strain as a function of age for all specimens tested (n=18)
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Contours of constant stress overlaid on strain field data for representative Group 1 (specimen 2), Group 2 (specimen 10), and Group 3 (specimen 17) specimens. The lines on each plot represent lines of constant Sθθ (left column of plots) or SLL (right column of plots).
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(a) Plot of I2 vs I1 for one representative Group 1 specimen (specimen 2, 22 years old) suggesting a linear relationship. (b) Plot of ∂W1/∂I1 as a function of I1 suggesting a quadratic relationship. Each of the symbols corresponds to a given biaxial protocol.
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Raw data and constitutive model fits for representative Group 1 (specimen 2, age 22), Group 2 (specimen 9, age 47), and Group 3 (specimen 17, age 75) specimens



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