Do blast induced skull flexures result in axonal deformation?

Harsha T. Garimella, Reuben H. Kraft, Andrzej J. Przekwas

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Subject-specific computer models (male and female) of the human head were used to investigate the possible axonal deformation resulting from the primary phase blast-induced skull flexures. The corresponding axonal tractography was explicitly incorporated into these finite element models using a recently developed technique based on the embedded finite element method. These models were subjected to extensive verification against experimental studies which examined their pressure and displacement response under a wide range of loading conditions. Once verified, a parametric study was developed to investigate the axonal deformation for a wide range of loading overpressures and directions as well as varying cerebrospinal fluid (CSF) material models. This study focuses on early times during a blast event, just as the shock transverses the skull (< 5 milliseconds). Corresponding boundary conditions were applied to eliminate the rotation effects and the resulting axonal deformation. A total of 138 simulations were developed± 128 simulations for studying the different loading scenarios and 10 simulations for studying the effects of CSF material model variance ±leading to a total of 10,702 simulation core hours. Extreme strains and strain rates along each of the fiber tracts in each of these scenarios were documented and presented here. The results suggest that the blast-induced skull flexures result in strain rates as high as 150±378 s-1. These high-strain rates of the axonal fiber tracts, caused by flexural displacement of the skull, could lead to a rate dependent micro-structural axonal damage, as pointed by other researchers.

Original languageEnglish (US)
Article numbere0190881
JournalPloS one
Volume13
Issue number3
DOIs
StatePublished - Mar 2018

Fingerprint

Skull
skull
Cerebrospinal fluid
cerebrospinal fluid
Strain rate
Cerebrospinal Fluid
Blast Crisis
computer simulation
Computer Simulation
Fibers
Shock
researchers
Head
Research Personnel
Pressure
Boundary conditions
Finite element method
methodology

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

Cite this

Garimella, Harsha T. ; Kraft, Reuben H. ; Przekwas, Andrzej J. / Do blast induced skull flexures result in axonal deformation?. In: PloS one. 2018 ; Vol. 13, No. 3.
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Do blast induced skull flexures result in axonal deformation? / Garimella, Harsha T.; Kraft, Reuben H.; Przekwas, Andrzej J.

In: PloS one, Vol. 13, No. 3, e0190881, 03.2018.

Research output: Contribution to journalArticle

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