期刊
JOURNAL OF BIOMECHANICS
卷 41, 期 7, 页码 1458-1466出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2008.02.023
关键词
biological tissues; variational; ogden; plasticity; shear; volumetric damage; finite strain; cavitation; genetic algorithms; Hyper elasticity; viscosity; microinertia
In this paper, a fully variational constitutive model of soft biological tissues is formulated in the finite strain regime. The model includes Ogden-type hype relasticity, finite viscosity, deviatoric and volumetric plasticity, rate and microinertia effects. Variational updates are obtained via time discretization and pre-minimization of a suitable objective function with respect to internal variables. Genetic algorithms are used for model parameter identification due to their suitability for non-convex, high dimensional optimization problems. The material behavior predicted by the model is compared to available tests on swine and human brain tissue. The ability of the model to predict a wide range of experimentally observed behavior, including hysteresis, cyclic softening, rate effects, and plastic deformation is demonstrated. (c) 2008 Elsevier Ltd. All rights reserved.
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