Military Helmet Design

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Mera Mostafa AbuShanab
Izzat Basem Omran
Ayed Hamad
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Military helmet is used to protect the soldiers head from serious injuries. As the weapons are in continuously development as their mass, material types and velocity, military helmet need to be developed too to meet their mean design objective. For example, light weight, ability to resist impact bullet penetration and the helmet should cover all the soldier’s head area. However, helmet made of steel sheets has problems for dealing with the massive development of high-speed bullets. To resist high speed bullets the helmet thickness should be increases that Increase the weight of the helmet and effect on the soldier movement and his ability in fighter. In this project composite material was investigated for designing military helmet. Composite material was selected since it has better properties than other material that meets the military helmet specifications. An Investigations using ABAQUS/CAE 2020 were carried out for different types of composite materials as Kevlar, carbon fiber E glass/epoxy. The result of these investigation was to use Kevlar 129 material since it needs less layers to resist penetration of a bullet with initial velocity of 800m/s. The other investigation carried out to compare between the shapes of the impact bullet. Two different types of bullets hemispherical and ogival nose shapes were simulated. The ogival shape bullet was more hazard than hemispherical bullet. Then an investigation was done for different lay up composite fiber direction. The simulations indicated that lay up fiber direction (45/-45) can absorb high energy than other layup fiber directions. Full model of military helmet was simulated using composite material Kevlar 129 and impacted with ogival bullet shape at initial velocity of 800m/s. The simulation was carried out at different impact velocity angle (0o, 30o, 45o, 60o, 90o). The results indicates that impact loading at 90o is the most dangers angle and the thickness of the helmet should be 10.25mm (41 layers) to prevent bullet penetration. Compression between theoretical and finite element simulation was carried out for the 0o angle of impact velocity angle. The theoretical calculations indicates that 11mm helmet thickness is needed to prevent penetration while 10 mm using finite element simulation. The results indicates that there is a good agreement between theoretical calculations and finite element simulation.