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Helmet Testing
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This chapter discusses helmet ballistic testing methodologies. It describes helmet design and suspension systems as well as current and proposed clay head forms used in the ballistic testing of helmets.
BALLISTIC HELMET TEST METHODOLGIES
The development of modern military helmets based on aramid fiber composites has been an outstanding success (e.g., Carey et al., ). Numerous soldiers and civilian police have been saved from threats that would have defeated earlier metallic helmets (Carey et al., ). However, though current protective levels have proved to be well matched to the threats they are designed to protect against, increasing threats on the battlefield, especially from high velocity rifle rounds, will likely require new or modified helmet test methodologies assess the risk of injuries while using improved ballistic protective helmets.
On the battlefield, mobility is often the key to survival. The development of robust test methodologies is crucial to comparing the effect of potential trauma to ergonomic and other trade-offs required for personal protection. The mass of the protection is particularly important, as it may impede mobility.
The standoff between the head and the backface of the helmet in the current helmet systems was designed to be 1.3 cm (0.5 in.) or greater (McManus, ). Substantial research has been performed on traumatic brain injury (TBI), but much of the work is not applicable to military threats. For example, TBI may occur from blunt impact during vehicle crashes, falls, and sports impacts. However, there are important physical differences between these lower velocity events and impacts from the backface of military helmets.
The difference in incoming momentum between several representative rounds ranging from 9 mm to 0.50 cal and a typical American football head contact is shown in Figure 7-1. The football impact typically has a much larger transfer of momentum, implying much greater overall head motion and more global internal brain deformation. This difference and the much more localized contact from a helmet backface deformation (BFD) impact raises questions about the applicability of existing head injury criteria.
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