Accession Number:

AD0659546

Title:

TWO-DIMENSIONAL FINITE DEFORMATION EXPERIMENTS ON DOG'S ARTERIES AND VEINS.

Descriptive Note:

Scientific interim rept.,

Corporate Author:

CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF THE AEROSPACE AND MECHANICAL ENGINEERING SCIENCES

Report Date:

1967-08-01

Pagination or Media Count:

35.0

Abstract:

Most published data on the blood vessel elasticity were obtained either in simple elongation or in simple inflation, but not simultaneously. For finite deformations, such data are insufficient to formulate a three-dimensional stress-strain law even if the material is isotropic and incompressible. Since the blood vessels are highly nonlinear, the Youngs modulus for a specimen varies continuously from almost zero at the undeformed state to a large final value, and a starement of the modulus without the corresponding stress level is meaningless. The purpose of the experiments reported in this paper is to illustrate a scheme remedying these difficulties. The tests consist of 1 a longitudinal stretching while the diameter of the vessel was maintained, 2 a lateral distension with the length of the vessel fixed, 3 stress relaxation at fixed strain, and 4 cyclic deformation. Two Lagrangian stresses stresses based on the vessels undeformed state and two extension ratios are used to describe the deformed state of the vessel under a symmetric loading. The nonlinearity in the elasticity, and the dependence of the stress on the strain-history is demonstrated. Author

Subject Categories:

  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE