Estimating the influence of neckform compliance on brain tissue strain during a Helmeted impact

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Title: Estimating the influence of neckform compliance on brain tissue strain during a Helmeted impact
Authors: Rousseau, Philippe
Hoshizaki, Thomas Blaine
Gilchrist, M. D.
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Date: Nov-2010
Online since: 2014-10-17T03:00:09Z
Abstract: The aim of this study was to determine if a change in neckform compliance could influence maximum principal strain in the brain white and grey matter, the brain stem and the cerebellum. This was done by impacting a Hybrid III headform with a 16.6 kg impactor arm at 5 m/s. Three different Hybrid III neckforms were used: 1) one 50th percentile male neckform - standard neckform; 2) one 50th percentile male neckform plus 30 per cent compliance - soft neckform; 3) one 50th percentile male neckform minus 30 per cent compliance - stiff neckform. The kinematic data obtained was then used to drive a finite element model developed by University College Dublin. The results showed that a decrease in neckform compliance had a significant effect on maximal principal strain in the cerebellum, where the stiff neck (0.050 ± 0.004) generated higher maximum principal strains than the standard neck (0.036 ± 0.003) and the soft neck (0.037 ± 0.001). There were no significant differences between the stiff (0.122 ± 0.013), standard (0.114 ± 0.020) and soft neck (0.119 ± 0.019) in the white matter; the stiff (0.168 ± 0.011), standard (0.176 ± 0.011) and soft neck (0.176 ± 0.007) in the grey matter; or the stiff (0.080 ± 0.003), standard (0.081 ± 0.006) and soft neck (0.085 ± 0.009) in the brain stem. The results were not linked to brain injury due to the absence of a commonly accepted threshold.
Type of material: Journal Article
Publisher: Society of Automotive Engineers
Journal: Stapp Car Crash Journal
Volume: 54
Start page: 37
End page: 48
Copyright (published version): 2010 Society of Automotive Engineers
Keywords: Impact biomechanicsBrain injuryFinite elementMaximal principal strain
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Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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