The multi-modal responses of a physical head model subjected to various blast exposure conditions

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Authors
  1. Ouellet, S.
  2. Philippens, M.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN)
Abstract
The local and global biomechanical response of the body to a blast wave is the first step of a sequence that leads to the development of stresses and strains which can exceed the tolerance of brain tissue. These stresses and strains may then lead to neuro-physical changes in the brain and contribute to initiate a cascade of events leading to injury. The specific biomechanical pathways by which the blast energy is transmitted through the head structure are, however, not clearly understood. Multiple transmission mechanisms have been proposed to explain the generation of brain stresses following the impingement of a blast wave on the head. With the use of a physical head model, the work presented here aims at demonstrating that the proposed transmission mechanisms are not mutually exclusive. They are part of a continuum of head responses where, depending on the exposure conditions, a given mechanism may or may not dominate. This article presents the joint analysis of previous blast test results generated with the brain injury protection evaluation device (BIPED) headform under four significantly different exposure conditions. The focus of the analysis is to demonstrate how the nature of the recorded response is highly dependent on the exposure characteristics and consequently, on the method used to reproduce blast exposure in a laboratory environment. The timing and magnitude of the variations in intra-cranial pressures (ICP) were analysed relative to the external pressure field
Keywords
Blast;headform;neurotrauma;head biomechanics;injury mechanism;intra-cranial pressure
Report Number
DRDC-RDDC-2017-P104 — External Literature
Date of publication
01 Nov 2017
Number of Pages
22
Reprinted from
Springer, Journal of Shock Waves
DSTKIM No
CA045493
CANDIS No
805907
Format(s):
Electronic Document(PDF)

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