![]() ![]() That would reduce vehicle weight significantly, improving fuel mileage and vehicle performance.”įor this study, researchers fired a 23×152 millimeter (mm) HEI round – often used in anti-aircraft weapons – into an aluminum strikeplate that was 2.3 mm thick. “Based on tests like these, we believe we can replace that rolled steel with steel-CMF without sacrificing safety, better blocking not only the fragments but also the blast waves that are responsible for trauma such as major brain injuries. “Many military vehicles use armor made of rolled homogeneous steel, which weighs three times as much as our steel-CMF,” Rabiei says. “We can provide as much protection as existing steel armor at a fraction of the weight – or provide much more protection at the same weight. “In short, we found that steel-CMF offers much more protection than all other existing armor materials while lowering the weight remarkably,” says Afsaneh Rabiei, senior author of a paper on the work and a professor of mechanical and aerospace engineering at NC State. ![]() Note that the CMF and aluminum panels had the same thickness and mass. Comparison of the stress distribution in CMF (a,c) and aluminum 5083-H116 (b,d) panels upon interaction with blast wave and fragment impacts resulted from HEI round at 50 µs (a,b) and 180 µs (c,d). Army’s Aviation Applied Technology Directorate shows that stainless steel composite metal foam (CMF) can block blast pressure and fragmentation at 5,000 feet per second from high explosive incendiary (HEI) rounds that detonate only 18 inches away. New research from North Carolina State University and the U.S. ![]()
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