Abstract
Analysis of viscoelastic properties of blood vessel walls presents difficult analytical problems in view of their non-homogeneity, anisotropy, and non-linear viscoelastic characteristics. The analytical technique used in this study is the numerical method of direct stiffness which has been successfully applied in preliminary studies. The direct stiffness method constitutes a finite element analysis, where the wall structure in an electron micrograph is represented by an assembly of triangular elements. Different material properties can be assigned to each triangular element; the method is thus ideally suited for computer analysis of non-homogeneous biological structures. Anatomical components considered in the analysis were two types of collagen fibers and smooth muscle cells. Typical circumferential stress-time and radius-time histories for selected points have been obtained in relaxed and constricted arterioles under static pressure loads. Plots of the stress distribution in cross sections of the vessel wall have been obtained in relaxed and constricted arterioles.
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