Extreme Energy Dissipation via Material Evolution in Carbon Nanotube Mats.
Extreme Energy Dissipation via Material Evolution in Carbon Nanotube Mats.
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通过碳纳米管垫中的材料演化的极端能量耗散。
DOI：
10.1002/advs.202003142
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发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
Thomas EL
中科院分区：
文献类型：
--
作者：
Hyon J;Lawal O;Thevamaran R;Song YE;Thomas EL
由相互连接的多壁碳纳米管(MWCNT)组成的层状薄垫进行了高超声速微弹撞击试验。MWCNT的形态是高度顺应性的，虽然这导致了相当温和的准静态力学性能，但在极端应变率和弹道碰撞产生的大应变下，MWCNT结构具有重新配置的能力，从而产生非凡的动能(KE)吸收。弹丸的动能通过摩擦相互作用、绝热加热、管子拉伸，最终使紧绷的管子和新形成的纤维断裂。每单位质量的薄膜吸收的能量可以从7-12 MJ kg−1，远远大于任何其他材料。多孔、无取向的多壁碳纳米管垫通过各种工艺耗散超乎寻常的动能，在冲击冲击过程中，它们能够显著地重新配置、对准和加强，从而对任何已知材料的弹丸穿孔表现出最高的比能量吸收(≈12-MJ kg−1)。
Thin layered mats comprised of an interconnected meandering network of multiwall carbon nanotubes (MWCNT) are subjected to a hypersonic micro‐projectile impact test. The mat morphology is highly compliant and while this leads to rather modest quasi‐static mechanical properties, at the extreme strain rates and large strains resulting from ballistic impact, the MWCNT structure has the ability to reconfigure resulting in extraordinary kinetic energy (KE) absorption. The KE of the projectile is dissipated via frictional interactions, adiabatic heating, tube stretching, and ultimately fracture of taut tubes and the newly formed fibrils. The energy absorbed per unit mass of the film can range from 7–12 MJ kg−1, much greater than any other material. Porous, unoriented multiwall carbon nanotube mats dissipate extraordinary amounts of kinetic energy by a variety of processes via their ability to dramatically reconfigure, align, and strengthen during shock impact to exhibit the highest specific energy absorption (≈12 MJ kg−1) for projectile perforation of any known material.
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