Investigation of retention and padding system influence on the backface deformation of helmets

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The retention system of a helmet is integral to its performance under impact, particularly for a helmet that will**be subjected to ballistic impact. The backface deformation within the helmet must be kept to a minimum, since**extensive deformation will lead to skull fracture. Foam padding is used in combination with an internal**retention system to maintain the positioning of the helmet, however this adds to the bulk of the helmet system,**the inertia from which can add to near- and long- term health concerns. An optimized helmet system would**have a high ballistic limit to stop ballistic threats while minimizing the backface deformation signature,**reducing stress transfer to the head of the wearer during impact, providing protection from bumps and falls, all**while providing comfort to the wearer.**In this proposed project we will investigate the relationship between retention systems and foam padding**within a helmet to the backface deformation of Revision Military helmet systems. The material properties of**the foams will be measured and implemented into a LSDYNA model that can be used to optimize the design of**the helmets. We will make use of a unique x-ray cinematography system to determine the interplay between the**foam, retention system, and the deformation of the helmet. The computational component to the project will**see stress-strain data collected for foams implemented into a helmet model in LSDYNA as a means of**validating the predictions of helmet performance, which are used extensively in the design of helmets. This**research effort will help to guide the future design of helmets with Revision Military.