Abstract
Characterization of anisotropy is studied in a bovine pericardial tissue undergoing non-homogeneous deformations. The purpose of this study is not to formulate an exact constitutive model for a particular tissue, but to develop a methodology for the measurement and representation of the stress-strain behavior of soft planar tissues, such as pericardium. Tissue samples with a central circular hole are subjected to uniaxial loading. A procedure for measuring local displacements is developed. Various constitutive models differing mainly in their representation of anisotropy are considered to simulate the test. The comparison of displacement and strain predictions with the measured values show that although the isotropic model has a good agreement with the data in the loading direction, the introduction of anisotropy is necessary to capture the essential characteristics of the test. The procedure provides a more realistic evaluation of the constitutive models, hence is more useful for stress analysis purposes.
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