A variational constitutive model for soft biological

JOURNAL OF BIOMECHANICS

卷:41

Article

El Sayed, Tamer¹  Mota, Alejandro¹  Fraternali, Fernando²  Ortiz, Michael¹ 

[1] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

[2] Univ Salerno, Dept Civil Engn, I-84084 Fisciano, SA, Italy

关键词: biological tissues;    variational;    ogden;    plasticity;    shear;    volumetric damage;    finite strain;    cavitation;    genetic algorithms;    Hyper elasticity;    viscosity;    microinertia;   

DOI  :  10.1016/j.jbiomech.2008.02.023

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free