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Extreme softness of brain matter in simple shear

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Author(s)
Destrade, Michel 
Gilchrist, M. D. 
Murphy, Jeremiah G. 
Rashid, Badar 
Saccomandi, Giuseppe 
Uri
http://hdl.handle.net/10197/7879
Date Issued
October 2015
Date Available
01T01:00:23Z October 2017
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.
Sponsorship
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 ma...

  • Simple shear

  • Constitutive modellin...

  • Experimental testing

  • Simulations

  • Poynting effect

DOI
10.1016/j.ijnonlinmec.2015.02.014
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Mechanical & Materials Engineering Research Collection
Scopus© citations
55
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Mar 31, 2023
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