Performance of a flying cross bar to incapacitate a long-rod penetrator based on a finite element model

Performance of a flying cross bar, instead of the flying plate, to incapacitate the long-rod penetrator, has been evaluated numerically based on a finite element model. The length to diameter ratio, L/D, of the penetrator was 30 and the velocity was 2.0 km/s. The length of the cross bar was fixed to 0.5L and the velocity of the bar was determined from its mass and given kinetic energy. The bar was assumed to impact the mid point of the penetrator at 45 of obliquity. The efficiency of flying cross bar is maximum when the diameter of the bar is in the range between 1D and 4D depending on the energy of the bar and the distance to witness block. The protection capability of the bar has been discussed in terms of the shape and lateral displacement of the disturbed penetrator by the flying cross bar.