engleski

Analyses of soft tissues behaviour using FEM

Modeling of biomaterials behavior, in this case soft tissues, has secured its place in ever more wide field of material research. In order to predict the behavior of such materials, a suitable material model must be fine tuned. That makes possible the simution of the real stress stretch relationship response of material under consideration. The basic material models utilized for modeling behavior of soft tissues were the ones initially developed for rubber-like materials showing hyperelastic characteristics. In this research the behavior of human cervical spine ligaments was considered. It is based on the experimentally gained load elongation response during materials lifetime, which consists of three characteristic parts, as the consequence mostly of the fibers stiffness changes through the process. The first part is nonlinear toe region, the second one is linear-like region and the third one presents damage initiation with post-failure region. In order to describe the material behavior as accurately as possible and to combine these different behavior trends, the hyperelastic material models were used. An efficient solution for simulation of the modelled material behavior is by using finite element method. In this work experimental data have been compared with results obtained using finite element method with several incorporated material models adapted for soft tissues. The presented analyses include Yeoh, Mooney-Rivlin, Neo-Hookean, Ogden and polinomal model with special consideration to relevant finite element coupled with the appropriate finite element method anayses set up.

Biomaterials ; FEM ; Material model

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