Extreme softness of brain matter in simple shear

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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 matterSimple shearConstitutive modellingExperimental testingSimulationsPoynting 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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