Fluid-Structure Interaction in Biological Media / FSI
Borhan Alhoseini Hamedani; Mehdi Navidbakhsh; Hosein Ahmaditafti
Volume 5, Issue 1 , June 2011, , Pages 45-56
Abstract
In this paper, study of mechanical properties of human blood vessels is considered, especially those of related to the Coronary Artery Bypass Graft (CABG). Unfortunately more than 30% of saphenous grafts are re-occluded within 10 years while mammary artery shows better results. In this study elastomechanical ...
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In this paper, study of mechanical properties of human blood vessels is considered, especially those of related to the Coronary Artery Bypass Graft (CABG). Unfortunately more than 30% of saphenous grafts are re-occluded within 10 years while mammary artery shows better results. In this study elastomechanical properties of human saphenous vein, which is common in CABG, is studied. Stress-stretch behavior of these samples after a cyclic loading was obtained and large deformation formulation was used to obtain real stress and stretch ratio of these vessels. Then a fourth order polynomial was used to show nonlinear behavior of these results. Results show that blood vessel stiffness in longitudinal direction is two times greater than circumferential direction, while it is more than 74% stretchable in the circumferential direction. So modulus of elasticity in longitudinal direction is greater than circumferential direction. If we continue stretching until final rupture after maximum strength, longitudinal samples will be broken down faster than circumferential samples because of collagen fibers orientation.
