کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
875271 | 910369 | 2008 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A variational constitutive model for soft biological tissues A variational constitutive model for soft biological tissues](/preview/png/875271.png)
In this paper, a fully variational constitutive model of soft biological tissues is formulated in the finite strain regime. The model includes Ogden-type hyperelasticity, 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.
Journal: Journal of Biomechanics - Volume 41, Issue 7, 2008, Pages 1458–1466