Improving Ballistic Performance of Polyurethane Foam by Nanoparticle Reinforcement

Table 2

Experimental data for sandwiches under high-velocity impact.

Material	Striking velocity (m/s)	Residual velocity (m/s)	Mass of projectile (gm)	Energy absorbed per areal density (N-m^3/Kg)	Ballistic limit per areal density (m^3/kg-s)
Neat Sandwich	783.95	732.69	13.23	42.94	23.29
	803.80	755.95	13.22	38.38	21.25
	819.35	769.70	12.83	40.74	22.62
Average				40.69	22.39
Nanophased Sandwich	793.75	738.37	13.23	47.06	24.42
	803.80	744.14	13.08	50.36	25.34
	821.15	763.12	12.93	49.56	25.28
Average				48.99	25.02
Gain				20%	12%