Influence of VN foam liner density on impact attenuation of an ice hockey helmet

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Title: Influence of VN foam liner density on impact attenuation of an ice hockey helmet
Authors: Meehan, Andrew
Date: 10-Apr-2017
Abstract: Ice hockey players wear helmets to protect against traumatic brain injury (TBI) and to mitigate the risk of mild traumatic brain injury (mTBI), such as concussion. Variations in external geometry and liner material type, thickness, and density can influence the protective capacity of a helmet. It would be beneficial to understand how liner material properties influence the helmet’s ability to manage the linear acceleration (linked to TBI) and rotational acceleration (linked to mTBI) forces of an impact. Thus, the purpose of this study was to examine the influence of VN foam liner density on the impact attenuation of an ice hockey helmet. Helmets fitted with three different densities of 0.5” vinyl nitrile (VN) foam liner (VN600, VN740, and VN1000) and a commercially available VN-lined helmet (V08) were impacted on a Shore A MEP pad at 4.5m/s and 6.5m/s across three sites, using a monorail drop rig. At 4.5m/s, the VN740 liner yielded the lowest linear acceleration across all three sites, and the lowest rotational acceleration at the front and side. At 6.5m/s, the VN1000 liner yielded the lowest linear acceleration at the side and rear, while the VN740 liner yielded the lowest rotational acceleration across all three sites. Overall, the medium-density VN740 liner effectively managed rotational acceleration forces, thus reducing the risk of concussive injury. Additionally, it is recommended that standards organizations perform test impacts at 4.5m/s to identify greater differences in protective capacity among helmets. Future studies may examine the influence of liner thickness on impact attenuation of an ice hockey helmet.
URL: http://hdl.handle.net/10393/36209
CollectionSciences de la santé - Affiches // Health Sciences - Research Posters
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