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TECHNICAL BRIEF

On the Sensitivity of Wall Stresses in Diseased Arteries to Variable Material Properties

[+] Author and Article Information
S. D. Williamson, Y. Lam, H. F. Younis, H. Huang, S. Patel, M. R. Kaazempur-Mofrad, R. D. Kamm

Department of Mechanical Engineering and the Biological Engineering Division, Massachusetts Institute of Technology, Cambridge, MA 02139

J Biomech Eng 125(1), 147-155 (Feb 14, 2003) (9 pages) doi:10.1115/1.1537736 History: Received June 01, 2000; Revised July 01, 2002; Online February 14, 2003
Copyright © 2003 by ASME
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References

Figures

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Histology of the post mortem specimen obtained from the coronary artery. Segmentation provided by Dr. Renu Virmani.
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Computational mesh with the model test points labeled. Red indicates normal arterial wall (media and adventitia combined), blue, fibrous plaque, purple, calcified plaque, and green, lipid pools.
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Diagram of residual stress calculation and application.
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Maximum principal stress band plot (in Pa) for isotropic trials using average parameters. The triangle indicates the location of maximum stress while the star indicates the location of minimum stress. Nonlinear isotropic (a) and nonlinear isotropic with residual stresses (b). In the nonlinear isotropic run, the location of maximum stress is also the rupture site.
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Maximum principal stress band plot (Pa) for a transversely isotropic trial of average parameters. The triangle indicates the point of maximum stress while the star indicates the point of minimum stress. In the transversely isotropic and nonlinear isotropic with residual strain runs, the point of maximum stress is in an area of artificial stress concentration.
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Graphical representation of maximum principal stress (panel a) and strain (panel b) vs. location in specimen for anisotropic and isotropic nonlinear (with and without residual strains). The specific locations in the specimen were: RUP, the rupture site, TP1, test point one, and TP2, test point two (see Fig. 2). The region (artery, fibrous, etc.) identifies in which portion of the model the parameters were changed in a given test (color coded in Fig. 2). Legend in (a) is applicable to both panels.
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Sensitivity of maximum principal stress (in % change from nominal values) for the isotropic nonlinear without residual strains model, vs. % change in a (left panel) and b (right panel) coefficients of the corresponding material as indicated in legend of (a). Legend in (a) is applicable to all plots.
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Sensitivity of maximum principal strain (in % change from nominal values) for the isotropic nonlinear model without residual strains, vs. % change in a (left panel) and b (right panel) coefficients of the corresponding material as indicated in legend of (a). Legend in (a) is applicable to all plots.
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Sensitivity of maximum principal stress and strain for the isotropic model with nonlinear residual strains, due to a −50% change in a (left panel) and b (right panel) of the corresponding material as indicated in each panel.
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Sensitivity of maximum principal stress and strain for the anisotropic model, due to −10% change in νθz of the corresponding material as indicated in each panel.

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