Dynamic response and damage of fiber metal interpenetrating composite plate under low-velocity impact

Fiber reinforced metal composites are prone to delamination of metal and fibre when subjected to impact, thus affecting the mechanical properties, in order to alleviate such phenomena, a three-dimensional composite Fiber Metal Interpenetrating Composite Plate (FMICP) was prepared by punching the metal plate and alternately threading it with carbon fibres and aramid fibres. Low-speed impact tests were conducted to investigate the mechanical properties of FMICP at different impact velocities, impact areas and punching styles. The study shows that: when the impact velocity is between 35.19 and 78.08 m/s, the FMICP undergoes penetration damage and absorbs 39.78 J to 70.67 J of impact energy; when subjected to a constant 49 J of impact energy, the FMICP with an impact area of 491 mm² is able to absorb a maximum of 42.77 J of energy; as the impact area increases, the number of fibers subjected to stretching in the FMICP increases, which decreases the punching damage and local damage caused by the impact; the type of punching changes the percentage of metal base in the FMICP and the mode of stress transfer, the elliptical punched FMICP (41.11 J) is able to absorb energy more effectively compared to the rectangular punched FMICP (34.08 J). The results of this study can provide a reference for the promotion and application of FMICP.