Investigation on Projectile Nose and Impact Angle Effects in High Velocity Impact on 4ply Glass/Carbon Laminates

In this study, 4 composite layers of plain carbon fiber fabric, plain glass fiber fabric and carbon-glass [carbon-glass-carbon-glass] fiber fabrics, are tested under high speed impact (118 m/s) with flat or half-spherical projectile in impact angles of 0, 30 and 45 degrees compared to the normal impact, and the amount of damage as well as their ballistic limit was studied. Results showed that with increase in the impact angle striked with the flat projectile, the ballistic limit decreased by 30% and the damage area decreased by 36%. Also, with the increase in the impact angle striked with the half-spherical projectile in speed of 118 m/s on 4 layers of carbon fiber fabric and glass fiber fabric, the ballistic limit increased by 25% and the damage area decreased by 40%. The maximum damage area and ballistic limit was in 4 layers of glass fiber fabric and the minimum damage area and the ballistic limit was observed in 4 layers of carbon fiber fabric, that with integration of these 2 fabrics and generating 4 layer fabric of carbon-glass, the high ballistic limit of glass fiber fabric and low damage area of 4-layer carbon fabric is achieved in 4 layer carbon-glass laminate.