A Biomechanical Composite Model to Determine Effective Elastic Moduli of the CNS Gray Matter
Mehdi Khoshgoftar, Siamak Najarian, Farhad Farmanzad, Bahman Vahidi and Farhad Tabatabai Ghomshe
DOI : 10.3844/ajassp.2007.918.924
American Journal of Applied Sciences
Volume 4, Issue 11
Brain tissue is a heterogeneous material with complicated microstructural features. Models based on microstructure can lead to more accurate and physically realistic predictions of mechanical characteristics of brain tissue. A two-step Mori-Tanaka/Voigt homogenization procedure is implemented into a 3D microstructurally-based multi-phase composite model, composed of randomly-oriented elastic axons, dendrites and neuronal cell bodies surrounded by an elastic matrix. The effects of microstructure-related scale on the effective elastic moduli of the cerebral cortex are analyzed by comparing the predictions from classical and micropolar continuum theories. For the first time, composite material rules and micropolar continuum theory have been utilized to investigate brain biomechanics. These findings can assist future efforts to be directed towards relating the microstructural aspects of the brain tissue to its macroscopic behavior.
© 2007 Mehdi Khoshgoftar, Siamak Najarian, Farhad Farmanzad, Bahman Vahidi and Farhad Tabatabai Ghomshe. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.