Simulation for fragment debris impacting composite shield in hypervelocity

The process of impact of flying fragment to the composite shield was simulated numerically by using the smoothed particle hydrodynamics method. The calculation model of cylindrical flying fragment impacting composite shield was developed, the protection capabilities of different composite and metal shields were compared, and the characteristics of different thickness ratios of composite shields were analyzed. The calculated results show that the composite shield with ceramic at front and aluminum at back has better protection capability, and the dual-layer composite shield has better protection capability than that of the aluminum and steel shields in the same mass; the optimal thickness ratios of ceramic and aluminum layers make the shield have the best protection capability.