Abstract
The objective of this research was to design pilot helmets and to perform analysis of designed ballistic helmet against impact strength of bullet in Solidworks and Laminator software. The material used for construction of the helmet is fiber reinforced polymer matrix composite in which polymer matrix is made of nylon, a thermoset resin, and the fibers are aramid, an aromatic polymide resin developed by E.I. duPont de Nemours and Company and sold under the trademarks Kevlar® and Nomex®. The design of the helmet is done by deciding the stacking sequence of various laminae which are oriented with main material directions at different angles to the global laminate axes in order to produce a structural element in the form of a shell. The simulation of the helmet in Solidworks and Laminator is done with an 8-g AK 47 bullet, hitting it with a velocity of 710 m/s. The model is validated against published data and a good correlation is observed. The result of this project is that a 1.30 kg helmet with shell thickness of 7 mm is obtained, which is economical, light weight and is able to give high-performance protection against ballistic shrapnel and bullets.
Highlights
The sizing, fit, and comfort have been the most frequent concern of the aviators in each of the different types of aircraft squadrons
Finite element analysis can be used as a method to characterize the response of composite pilot helmet and to obtain valuable information on parameters affecting impact phenomena (Othman 2009)
Displacements are measured in meters from the position where the bullet hits the helmet surface before any deformation occurs (Fig. 8a)
Summary
The sizing, fit, and comfort have been the most frequent concern of the aviators in each of the different types of aircraft squadrons. Pilot helmet has been used as protective equipment in order to shield human head against serious injuries from shrapnel and bullets. Most modern ballistic helmets are made from a plurality of plies of ballistic material which are laid up in a mold and shaped to the configuration of the helmet. Pilot helmet made of composite materials has become a better equipment compared to traditional steel helmet in terms of the reduction in weight and the improvement in ballistic resistance. The first dimension of the helmet is decided according to the average size of human head (Figure 1)
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