Composite metal foams (CMFs) are enough to turn an armor-piercing projectile shot at it into powder. These foams are lighter than materials reinforced with metal coatings, which are more suitable for the manufacture of new types of car bodies and the assembly of vehicle armor-and these are just the tip of the iceberg of its potential uses.

Afsaneh Rabiei (Professor of Mechanical and Aerospace Engineering in North Carolina) has been committed to the development and characterization of CMFs for many years. With the help of high-speed cameras, they produced related videos to show the superior performance of CMFs materials. The armor in the video is made of CMFs. The bullet used for shooting is a 7.62×63 mm M2 armor-piercing bullet. This bullet fires the armor in accordance with the standards set by the National Institute of Justice (NIJ). The results of the test were quite unexpected.

"We found that the bullet stopped within an inch of the armor, and the back dent was less than 8 mm," rabiei said. "The NIJ standard allows armor dents up to 44 mM." The results of this study were published in 2015. The addition of Kevlar or aluminum back panels to the foam will help to increase the power to dissipate energy and help create lighter armor. The researchers say the use of composite metal foam may reduce the armor's weight by 20%, while increasing its ability to stop bullets.
It is not only in armor that materials are extremely light and strong, but many other applications also require this property. For example, from space exploration to transportation of nuclear waste, not only does it need to be light and strong, but it also needs to be able to withstand extremely high temperatures and shield against radiation.

With the further research on these CMFs, CMFs may be widely used as lightweight and high strength materials in the future.

So the bullet is no longer impregnable. It has a killer