Type

Journal Article

Authors

Giuseppe Saccomandi
Badar Rashid
Jeremiah G. Murphy
M. D. Gilchrist
Michel Destrade

Subjects

Engineering

Topics
simple shear simulations poynting effect shear stress mechanics of brain matter constitutive modelling experimental testing non linear elasticity

Extreme softness of brain matter in simple shear (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.
Collections Ireland -> University College Dublin -> Mechanical & Materials Engineering Research Collection
Ireland -> University College Dublin -> School of Mechanical and Materials Engineering

Full list of authors on original publication

Giuseppe Saccomandi, Badar Rashid, Jeremiah G. Murphy, M. D. Gilchrist, Michel Destrade

Experts in our system

1
Giuseppe Saccomandi
University College Dublin
Total Publications: 4
 
2
Badar Rashid
University College Dublin
Total Publications: 16
 
3
Jeremiah G Murphy
Dublin City University
Total Publications: 16
 
4
M. D. Gilchrist
University College Dublin
Total Publications: 172
 
5
Michel Destrade
National University of Ireland Galway
Total Publications: 106