In this section
@article{Ghajari:2016:10.1007/s10443-016-9566-4,
author = {Ghajari, M and Farajzadeh, Khosroshahi S},
doi = {10.1007/s10443-016-9566-4},
journal = {Applied Composite Materials},
pages = {931--944},
title = {Optimization of the chin bar of a composite-shell helmet to mitigate the upper neck force},
url = {http://dx.doi.org/10.1007/s10443-016-9566-4},
volume = {24},
year = {2016}
}
TY - JOUR
AB - The chin bar of motorcyclefull-face helmets is the most likely region of the helmet tosustain impactsduring accidents, with alarge percentageof these impacts leadingto basilar skull fracture. Currently, helmet chin bars are designed to mitigate the peak acceleration at the centre of gravityof isolated headforms, as required by standards, but they are not designed to mitigate the neck force, which is probably the cause of basilar skull fracture, a type of head injury that can lead to fatalities. Here we test whether it is possible to increase the protection of helmet chin bars while meeting standard requirements. Fibre-reinforced composite shells are commonly used in helmets due to their lightweight and energy absorption characteristics. We optimize the ply orientation of a chin bar made of fibre-reinforced composite layersfor reduction of the neck force in a dummy modelusing a computational approach. We use thefinite element model of a human head/neck surrogateandmeasure the neck axial force, which has been shown to be correlated withthe risk of basilar skull fracture. The results show that by varying the orientationof the chin bar plies, thus keeping the helmetmass constant, the neck axial force can be reduced by approximately 30%while ensuring that the helmet complies withtheimpact attenuation requirementsprescribed in helmet standards.
AU - Ghajari,M
AU - Farajzadeh,Khosroshahi S
DO - 10.1007/s10443-016-9566-4
EP - 944
PY - 2016///
SN - 1573-4897
SP - 931
TI - Optimization of the chin bar of a composite-shell helmet to mitigate the upper neck force
T2 - Applied Composite Materials
UR - http://dx.doi.org/10.1007/s10443-016-9566-4
UR - http://hdl.handle.net/10044/1/42909
VL - 24
ER -
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