Abstract

The need for high-performance composites with superior properties tailored to the requirements of defense and aerospace
applications led to the development of hybrid reinforcement systems in which two or more reinforcing fibers are combined with
thermoset or thermoplastic based matrix. DEBEL has developed a series of aramid and UHMWPE based technical textiles,
multiaxial fabric and hybrid fabrics intended for the development of lightweight helmets for fighter aircraft pilots. These
are developed to meet good impact attenuation, resistance to drop penetration and most importantly to meet airworthiness
requirements that include windblast test. Helmet shells were fabricated using the above fabrics in various combinations and tested
for impact and drop penetration resistance as per the MIL87174 A standard. The Helmet shell developed from or combination
of low modulus aramid fabric62 gsm and high modulus aramid fabric 170 gsm is lightweight (328 gm) and can withstand more
than 48 Joules of impact energy. Efforts are also being made to use thermoplastic fiber based combinations using compression
molding or injection molding to further reduce the weight without compromising its functional properties.