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.
|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||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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