Carmichael’s Concise Review
Specifi c tensile strength of the densifi ed wood was about twice that of high-specifi c-strength steel, lightweight titanium alloy, and other structural materials. Song et al. performed many diff erent mechanical tests that demonstrated densifi ed wood had many-fold superior strength and toughness compared to natural wood. T ey tested several species of hardwoods and soſt woods and found similar enhancements in the mechanical properties of all of them. To specifi cally examine the potential for using densifi ed wood in body armor, Song et al. performed ballistic tests on natural wood, a single layer of densifi ed wood and a fi ve-layered laminate of densifi ed wood with alternating the grain direction by 90° between each layer. T e ballistic resistance of the densifi ed wood was much higher than natural wood and even higher in the laminate. T ese strong and tough yet lightweight densifi ed woods are promising materials for low-cost body armor and ballistic energy absorption. Indeed, densifi ed wood has great promise as a high-performance structural material. It will be interesting to see how this processing method will be applied in the future to low-cost and renewable wood! Inventwood, a spin-off company at the University of Maryland, is working on commercialization of this technology.
References [1] JC Song et al ., Nature 554 ( 2018 ) 224 – 29 . [2] T e author gratefully acknowledges Dr. Teng Li for reviewing this article.
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