A Three-dimensional Finite Element Model for Arterial Clamping

[+] Author and Article Information
Thomas C. Gasser, Christian A. J. Schulze-Bauer, Gerhard A. Holzapfel

Graz University of Technology Institute for Structural Analysis–Computational Biomechanics Schiesstattgasse 14-B, A-8010 Graz, AustriaURL: http://www.cis.tu-graz.ac.at/biomech

J Biomech Eng 124(4), 355-363 (Jul 30, 2002) (9 pages) doi:10.1115/1.1485284 History: Received April 05, 2001; Revised March 01, 2002; Online July 30, 2002
Copyright © 2002 by ASME
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Opened-up reference (stress-free) configuration of an arterial layer and associated geometrical data for the media and adventitia
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Boundary conditions in the x1−x2 plane for the 60.0° wedge of the stress-free adventitia (solid lines). All nodes of one end of the wedge (close-up view A) are enforced to move in the x2-direction such that a 90.0° wedge is achieved (dashed lines).
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Distribution of the (circumferential) Cauchy stress through the deformed media and adventitia. (a) Residual stresses at the load-free configuration (internal pressure pi=0.0 (kPa) and axial stretch λz=1.0). (b) Stresses at the physiological configuration (pi=13.33 (kPa) and λz=1.1). The numerical results are based on the opened-up geometry, as given in Figure 1, and the parameters for the media and adventitia according to Table 1.
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Deformed states of the artery before and after pinching off with a clamp. (a) Artery (media and adventitia) at the physiological configuration with an open clamp. (b) Deformed state of the artery, for which the maximum clamp displacement has been applied (full contact between the clamp and the artery).
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Deformed states of the artery (media and adventitia) at different displacements of the clamp
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Evolutions of the normalized circumferential and axial stresses (sθ,sz) with the clamp displacement at a certain point P located at the inner surface of the media. Note the high increase of sz with respect to the physiological configuration.
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Distribution of the Axial Cauchy stress in (a) the media and (b) the adventitia at the final state of the clamping process




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