Abstract
A constitutive law of the smooth muscle contracted arterial wall was proposed on the basis of mechanical test data obtained under both active and passive conditions. The artery was assumed to be a thick-walled orthotropic tube made of nonlinear, incompressible elastic material. Both circumferential and axial constrictions were considered when smooth muscle cells were activated. Wall stress was assumed to be a sum of passive and active stresses ; a logarithmic function was used to express the stress-strain relation under passive condition, while the relation between active stress and circumferential stretch ratio was expressed by a normal distribution-type function. The calculated pressure-diameter-axial force relations agreed well with the experimental data.
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