http://www.inhabitat.com/2010/02/01/researcher-creates-strongest-metal-foam-ever/
Spongy metal sounds like a bit of an oxymoron, but it’s actually a real material that is capable of absorbing large impacts without damage. Metal foams have been around for some time, but new research by Dr. Afsaneh Rabiei of North Carolina State University, has revealed the strongest metal foam ever. It can compress up to 80% of its original size under loading and still retain its original shape. The applications for this type of material are too numerous to fathom, but one of the most anticipated uses for the spongy metal is in automobiles to lessen the impact of crashes and protect the driver and passengers.
Metal foam is exactly what you might think – a cellular structure made from metal with tiny pockets of space inside. What makes Rabiei’s metal foam better than others is that she’s been able to make the tiny pockets of space more uniform. And that apparently is what gives it the strength as well as elasticity it needs in order to compress as much as it does without deformation. Many tests are being performed in the laboratory to determine its strength, but so far Rabiei says that the spongy material has “a much higher strength-to-density ratio than any metal foam that has ever been reported.”
Calculations also predict that in car accidents, when two pieces of her composite metal foam are inserted “behind the bumper of a car traveling at 28 mph, the impact would feel the same to passengers as an impact traveling at only 5 mph.” Applications for this amazing material are numerous and life changing. Naturally, this metal foam could be integrated into the bodies of cars to minimize the impact from crashes, but it could also be used for body armor or even in artificial limbs. It’s even foreseeable that the metal foam could be used in buildings and help absorb shocks from earthquakes.
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発泡金属は多くの空洞を含むスポンジのような形状をしており、これ自体は新しいものではない。しかしAfsaneh Rabiei博士率いる研究チームが開発した素材は従来のものより空洞の大きさが均質であるため強度及び弾力性に優れており、形を保ったまま元の大きさの8割にまで圧縮することも可能という。
Rabiei博士曰く、新素材は従来のものと比較して非常に高い強度・密度比であり、計算上では車のバンパーにこの素材を組み込むことで時速28マイル（およそ45km）での衝突時の衝撃が時速5マイル（およそ8km）で衝突したのと同等になるとのこと。
現在様々な強度検証実験が行われているとのことで、将来的には車や装甲などの衝撃吸収素材以外にも、地震の衝撃を吸収する素材として建築物への応用も考えられるそうだ。
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