Zusammenfassung
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.
- algorithms,
- biological
- cavitation,
- damage,
- elasticity,
- finite
- genetic
- hyper
- microinertia
- ogden,
- plasticity,
- shear,
- strain,
- tissues,
- variational,
- viscosity,
- volumetric
Nutzer