The bullet, delivering 2,780 foot-pounds of energy against a block of CMF less than one inch thick, shattered on impact. In 2016, Popular Mechanics described an early test involving the material and a M2. This not only makes CMF lighter than normal metal, but it also makes CMF spongy, allowing it to give slightly under impact, soaking up some of the energy of a collision. “Metal foam” is exactly what you think it is-metal with sponge-like holes in it. Scientists at North Carolina State University and the US Army’s Aviation Applied Technology Directorate have invented what they call Composite Metal Foam (CMF). The discovery has broad implications for armored vehicles, and could result in stronger, lighter vehicles better able to protect occupants from the impact of kinetic weapons, explosive shockwaves, and fires. Researchers have discovered that composite metal foam offers greater protection than traditional armor steel plate at a third of the weight.
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