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Physics of IED blast shock tube simulations for mTBI research

Author: Mediavilla Varas, J. · Philippens, M.M.G.M. · Meijer, S.R. · Berg, A.C. van den · Sibma, P.C. · Bree, J.L.M.J. van · Vries, D.V.W.M. de
Type:article
Date:2011
Source:Fontiers in Neurology, September, 2, 14 p.
Identifier: 435810
doi: doi:10.3389/fneur.2011.00058
Article number: Article 58
Keywords: Blast · CFD · Finite element · IED · mTBI · Shock tube · Surrogate · Traumatic brain injury · Mechatronics, Mechanics & Materials · EBP - Explosions, Ballistics & Protection · TS - Technical Sciences

Abstract

Shock tube experiments and simulations are conducted with a spherical gelatin filled skull- brain surrogate, in order to study the mechanisms leading to blast induced mild traumatic brain injury. A shock tube including sensor system is optimized to simulate realistic impro-vised explosive device blast profiles obtained from full scale field tests. The response of the skull-brain surrogate is monitored using pressure and strain measurements. Fluid- structure interaction is modeled using a combination of computational fluid dynamics (CFD) simulations for the air blast, and a finite element model for the structural response. The results help to understand the physics of wave propagation, from air blast into the skull- brain.The presence of openings on the skull and its orientation does have a strong effect on the internal pressure. A parameter study reveals that when there is an opening in the skull, the skull gives little protection and the internal pressure is fairly independent on the skull stiffness; the gelatin shear stiffness has little effect on the internal pressure. Simulations show that the presence of pressure sensors in the gelatin hardly disturbs the pressure field. © 2011