“…On the impact side and rear side, the fragment length at 5.2-5.7 km/s was clearly longer than that at 2.2-2.5 km/s, and the number of fragments at 5.2-5.7 km/s was clearly greater than that at 2.2-2.5 km/s. In general, the fragment length and the number of fragments increase with impact velocity even in the case of CFRP (i.e., 13,15 ) as well as aluminum alloy plates. 12 Even when irradiated specimens were used, the fragment length increased with impact velocity.…”