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Extreme softness of brain matter in simple shear
Michel Destrade, Michael D. Gilchrist, Jerry G. Murphy +2
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…
Deficiencies in numerical models of anisotropic nonlinearly elastic materials
Aisling Ni Annaidh, Michel Destrade, Michael D. Gilchrist +1
Incompressible nonlinearly hyperelastic materials are rarely simulated in Finite Element numerical experiments as being perfectly incompressible because of the numerical difficulti…
Mechanical characterization of brain tissue in simple shear at dynamic strain rates
Badar Rashid, Michel Destrade, Michael D. Gilchrist
During severe impact conditions, brain tissue experiences a rapid and complex deformation, which can be seen as a mixture of compression, tension and shear. Moreover, diffuse axona…
Mechanical characterization of brain tissue in tension at dynamic strain rates
Badar Rashid, Michel Destrade, Michael D. Gilchrist
Mechanical characterization of brain tissue at high loading velocities is crucial for modeling Traumatic Brain Injury (TBI). During severe impact conditions, brain tissue experienc…
A combined experimental and numerical study of stab-penetration forces
Aisling Ni Annaidh, Marie Cassidy, Michael Curtis +2
The magnitude of force used in a stabbing incident can be difficult to quantify, although the estimate given by forensic pathologists is often seen as `critical' evidence in medico…
Influence of Preservation Temperature on the Measured Mechanical Properties of Brain Tissue
Badar Rashid, Michel Destrade, Michael Gilchrist
The large variability in experimentally measured mechanical properties of brain tissue is due to many factors including heterogeneity, anisotropy, age dependence and post-mortem ti…
Slight compressibility and sensitivity to changes in Poisson's ratio
Michel Destrade, Michael D. Gilchrist, Julie Motherway +1
Finite Element simulations of rubbers and biological soft tissue usually assume that the material being deformed is slightly compressible. It is shown here that in shearing deforma…
Third- and fourth-order constants of incompressible soft solids and the acousto-elastic effect
Michel Destrade, Michael D. Gilchrist, G. Saccomandi
Acousto-elasticity is concerned with the propagation of small-amplitude waves in deformed solids. Results previously established for the incremental elastodynamics of exact non-lin…
Onset of Non-Linearity in the Elastic Bending of Blocks
Michel Destrade, Michael D. Gilchrist, Jerry G. Murphy
The classical flexure problem of non-linear incompressible elasticity is revisited assuming that the bending angle suffered by the block is specified instead of the usual applied m…
Third- and fourth-order elasticity of biological soft tissues
Michel Destrade, Michael D. Gilchrist, Raymond W. Ogden
In the theory of weakly non-linear elasticity, Hamilton et al. [J. Acoust. Soc. Am. \textbf{116} (2004) 41] identified as the fourth-order expansion…
Bimodular rubber buckles early in bending
Michel Destrade, Michael D. Gilchrist, Julie A. Motherway +1
A block of rubber eventually buckles under severe flexure, and several axial wrinkles appear on the inner curved face of the bent block. Experimental measurements reveal that the b…