Study of the Impact Response of Glass Fiber Reinforced Aluminium Laminates for Conical and Blunt Nose Projectiles

摘要

It is know n that fiber metal laminates (FML) as one of hybrid materials w ith thin metal sheets and fiber/epoxy layers have the characteristics of the excellent damage tolerance, fatigue and impact properties with a relatively low density. Therefore, the mechanical components using FML can contribute the enhanced safety level of the sound construction toward the whole body. In the present study, the impact performance of glass fibers reinforced aluminum laminates (GFRAL) is investigated by experiments and numerical simulations. Impact tests are carried out with the blunt and conical nose projectiles of mass 29 g within sub ordnance velocity range (50-150 m/s). Two different thicknesses viz. 2.6 mm and 3.1 mm are impacted. Dynamic non-linear transient analyses are also accomplished using finite element analysis software, ABAQUS. Results show higher ballistic limit for conical nose projectile co mpared to blunt nose. Also, failure mode in case of conical nose projectile impact is petalling with localized delamination of the GFRAL specimen. In case of blunt nose projectile impact plugs are sheared off from front (aluminium) plate and middle (GFRP) plate. One thing is co mmon in failure modes by both conical and blunt nose projectiles, delamination of GFRP plate in itself.