The influence of deflection and neck compliance on the impact dynamics of a Hybrid III headform

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Rousseau, P.; Hoshizaki, T. B.

The influence of deflection and neck compliance on the impact dynamics of a Hybrid III headform

Proc Inst Mech Eng Part P-J Sports Eng Tech. 2009;223(1):89-97

©2009 IMechE

Affiliations

¹Neurotrauma Impact Science Laboratory, Department of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
Abstract and keywords

The objective of this study was to determine the influence of impact deflection and neck compliance on the Gadd severity index (GSI), peak linear acceleration, and peak angular acceleration during a front impact to a Hybrid III head using a pneumatic linear impactor. Impact deflection was performed by translating the headform laterally and was shown to be effective at reducing the linear and angular accelerations as well as the GSI. Neck compliance was altered using one Hybrid III 50th percentile neck and two modified Hybrid III necks. A less compliant neck increased linear acceleration but decreased angular acceleration and GSI. When compared with estimated injury thresholds, the results demonstrated that an increase in the lateral translation or a decrease in the neck compliance resulted in a significant decrease in the risk of injury as reflected by peak linear and angular accelerations and the GSI.

Keywords: sports; mild traumatic brain injury; biomechanics; linear acceleration; angular acceleration
Links

DOI: 10.1243/17543371JSET34

WoS: 000282935500001
History

Received: 2008-11-29

Accepted: 2009-04-03

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2016	Bourdet N, Mojumder S, Piantini S, Deck C, Pierini M, Willinger R. Proposal of a new motorcycle helmet test method for tangential impact. In: Proceedings of the 2016 International IRCOBI Conference on the Biomechanics of Injury. September 14-16, 2016; Malaga, Spain.479-489.
2010	Rousseau P, Hoshizaki TB, Gilchrist MD, Post A. Estimating the influence of neckform compliance on brain tissue strain during a helmeted impact. Stapp Car Crash J. 2010;54:37-48. SAE 2010-22-0003.
2013	Post A, Oeur A, Hoshizaki B, Gilchrist MD. Examination of the relationship between peak linear and angular accelerations to brain deformation metrics in hockey helmet impacts. Comput Methods Biomech Biomed Eng. 2013;16(5):511-519.
2020	Jesunathadas M, Gould TE, Plaisted TA, Edwards ED, Piland SG. Describing headform pose and impact location for blunt impact testing. J Biomech. August 26, 2020;109:109923.
2020	McGillivray K. Comparison of Innovated Thermoplastic Polyurethane and Commercial Helmet Lining Technology in Mitigating Concussions as Measured by Linear Accelerations and Risk of Head Injury During Simulated Horizontal Impacts to the Head [Master's thesis]. Thunder Bay, ON: Lakehead University; 2020.
2011	Coulson NR. The Influence of Impact Mass, Inbound Velocity and System Compliance on the Dynamic Response of a Hybrid III Head Form [Master's thesis]. Ottawa, ON: University of Ottawa; 2011.
2012	Oeur A. An Analysis of Head Impact Angle on the Dynamic Response of a Hybrid III Headform and Brain Tissue Deformation [Master's thesis]. Ottawa, ON: University of Ottawa; December 2012.
2019	Bruneau D. Investigation of Head and Brain Response in Football Helmet Impacts Using a Finite Element Model of the Head and Neck With Active Muscle [Master's thesis]. University of Waterloo; 2019.
2010	Stojsih S. The Biomechanics of Amateur Boxers [Master's thesis]. Detroit, MI: Wayne State University; August 2010.