血管壁に対する非弾性構成式の改良について

概要

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In this paper, an improved version of a transversely isotropic inelastic constitutive model for a blood vessel is proposed. First, it has been observed that a steep curve of the cyclic internal pressure-diameter relation exists in the range of high internal pressure. In this model, a logarithmic type of a strain energy density function replaces the exponential one in the elastic part of the model. Then, a single evolution equation replaces the set of two to prevent ratcheting in the inelastic part of the model, which simplifies the model and makes it easier to identify the material constants. Based on the results from numerical calculations for uniaxial cyclic loading, stress relaxation tests as well as stress analyses under the condition of constant axial stretch and cyclic pressurization, it can be shown that the improved model describes well the anisotropic inelastic mechanical behavior of blood vessels.
一般社団法人日本機械学会の論文
1991-02-25