Extreme softness of brain matter in simple shear |
| |
Institution: | 1. Mechanical and Aerospace Engineering Department, University of Texas at Arlington, Arlington, Texas, USA;2. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran |
| |
Abstract: | We show that porcine brain matter can be modelled accurately as a very soft rubber-like material using the Mooney–Rivlin strain energy function, up to strains as high as 60%. This result followed from simple shear experiments performed on small rectangular fresh samples (2.5 cm3 and 1.1 cm3) at quasi-static strain rates. They revealed a linear shear stress–shear strain relationship , characteristic of Mooney–Rivlin materials at large strains. We found that porcine brain matter is about 30 times less resistant to shear forces than a silicone gel. We also verified experimentally that brain matter exhibits the positive Poynting effect of non-linear elasticity, and numerically that the stress and strain fields remain mostly homogeneous throughout the thickness of the samples in simple shear. |
| |
Keywords: | Mechanics of brain matter Simple shear Constitutive modelling Experimental testing Simulations Poynting effect |
本文献已被 ScienceDirect 等数据库收录! |
|