Investigating the effect of polymeric foam on the penetration of projectile in the foam-filled honeycomb structures

In this paper the ballistic limit velocity and damaged area of metallic honeycombs filled with polyurethane foam at normal impact are studied experimentally. In this study two types of polyurethane foam and two projectiles with different masses are used. The experimental results showed that filling the honeycomb with foams leads to an increase in the ballistic limit velocity. The increase was significant for the foam #2. The ratio of increase in ballistic limit velocity to the density of the foams was computed. Considering this ratio the foam #2 was seen to be a better filler for absorbing the impact energy. The damaged area formed by the projectile in the case of empty honeycomb is almost circular in shape and its diameter is equal to the projectile diameter on the impacted side of the panels, on the rear side, though, the damage is elliptical in shape and its diameter is about 2–4 times the projectile diameter. In the case of foam filled honeycomb the damaged area is circular in shape and its diameter is equal to the projectile diameter on both sides.

کلیدواژه ها:

Polymeric foam ، Honeycomb ، Penetration ، Ballistic limit velocity ، Damaged area