Um modelo constitutivo variacional com anisotropia induzida para tecidos biológicos moles

Resumo

Viscoelasticity, strongly nonlinear behavior, and damage are commonly observed mechanical
behavior exhibited by most soft biological tissues. Also, tendons, arteries and skin can progressively
show lower extensibility during increasing stretches, which may be referred to strain orientation effects.
In addition, due to its internal organization, experimental observations have shown that finite strains
induce a directional history-dependent organization of the fibers. In order to account these mechanical
behaviors, in this work, a variational micromechanics-inspired constitutive model is presented. This
model is based on the full-network approach with a viscous and a damage internal variable. Some
numerical tests are presented to evaluate the constitutive model capabilities in order to represent soft

biological tissues. The results have shown that the model is capable of representing the anisotropic-
induced behavior observed in soft biological tissues.