we are already using something similar in todays missile warheads.
The AIM 7 warhead is what is called an expanding rod bundle. The general effect is very similar to a TDX explosive.
A description is, Take several dozen foot long square rods, line them up outside of a tube, slightly canted to the right. Take several dozen more rods, do the same, but cant them to the left. Line up the inner and outer layer so that the ends are in line. Tack weld the ends of the rods togather. Put a tube down the center. Fill with medium, nonbrisiant explosive so the rods will not shatter on detonation. Put your fuze at the ends of the center tube, wired to detonate simultaneously.
The warhead functions as follows.
Tjhe pilot locks on and fires. The motor burns at a high G for a very short time. The Arming device arms the warhead. The target detector sends out a radar signal, waiting for a bounce back. When the target detector gets it's reutrn signal, it sends a detonation cammand to the fuzes. The fuzes detonate simultaneously. The detonation wave travels through the explosive of the warhead from the ends, building up pressure inside the rod case. As theblast fronts met in the middle, the pressure wave travels directly out from the centerline of the warhead. The rod bundle is thrust outward, expanding at explosive speed in a circle. The end welds do not break unitl the rods are fully expanded. Before this happens, the rods should have hit the target, cutting it in half. Most of the explosive force of the warhead is sent out perpendicular to the warhead, with some spillage in other directions.
This means that a near miss is not a miss at all, but a hard kill. A direct hit may be more survivable than a near miss, depending on the area and angle of the hit.