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Extreme softness of brain matter in simple shear
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| Gilchrist_132_Archival_Repository.pdf | 4.87 MB | Adobe PDF | Download |
| Title: | Extreme softness of brain matter in simple shear | Authors: | Destrade, Michel Gilchrist, M. D. Murphy, Jeremiah G. Rashid, Badar Saccomandi, Giuseppe |
Permanent link: | http://hdl.handle.net/10197/7879 | Date: | Oct-2015 | 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 (R2>0.97), 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. | Funding Details: | Irish Research Council | Type of material: | Journal Article | Publisher: | Elsevier | Journal: | International Journal of Non-Linear Mechanics | Volume: | 75 | Start page: | 54 | End page: | 58 | Copyright (published version): | 2015 Elsevier | Keywords: | Mechanics of brain matter; Simple shear; Constitutive modelling; Experimental testing; Simulations; Poynting effect | DOI: | 10.1016/j.ijnonlinmec.2015.02.014 | Language: | en | Status of Item: | Peer reviewed |
| Appears in Collections: | Mechanical & Materials Engineering Research Collection |
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