Super-elastic and fatigue resistant carbon material with lamellar multi-arch microstructure.
Super-elastic and fatigue resistant carbon material with lamellar multi-arch microstructure.
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DOI：
10.1038/ncomms12920
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发表时间：
2016-09-27
影响因子：
16.6
通讯作者：
Yu, Shu-Hong
中科院分区：
文献类型：
--
作者：
Gao, Huai-Ling;Zhu, Yin-Bo;Mao, Li-Bo;Wang, Feng-Chao;Luo, Xi-Sheng;Liu, Yang-Yi;Lu, Yang;Pan, Zhao;Ge, Jin;Shen, Wei;Zheng, Ya-Rong;Xu, Liang;Wang, Lin-Jun;Xu, Wei-Hong;Wu, Heng-An;Yu, Shu-Hong
低密度可压缩材料具有多种应用，但通常受到结构疲劳失效、弹性弱、恢复速度慢和能量耗散大的阻碍。在这里，我们展示了一种具有微观结构衍生的超弹性和高抗疲劳性的碳材料，该材料通过设计由数千个作为弹性单元的微尺度拱组成的分层层状结构来实现。所获得的整体碳材料可以以快的恢复速度（580 mm s-1）以类似弹簧的方式使钢球回弹，并且即使在90%应变下，在每个压缩-释放循环中也表现出完全恢复和小的能量耗散（0.2）。特别是，该材料在20%应变下超过106次循环和50%应变下超过2.5 × 105次循环后仍能保持结构完整性。这种结构材料虽然使用固有脆性的碳成分构造，但同时具有超弹性、高度可压缩性和抗疲劳性，其程度甚至大于先前报道的主要由更坚固的成分制成的可压缩泡沫。 低密度可压缩材料通常遭受疲劳引起的失效或有限的弹性。在这里，作者创造了一种分层多拱碳材料，同时实现高压缩性，上级弹性和抗疲劳性，灵感来自日常生活中的拱属性。
Low-density compressible materials enable various applications but are often hindered by structure-derived fatigue failure, weak elasticity with slow recovery speed and large energy dissipation. Here we demonstrate a carbon material with microstructure-derived super-elasticity and high fatigue resistance achieved by designing a hierarchical lamellar architecture composed of thousands of microscale arches that serve as elastic units. The obtained monolithic carbon material can rebound a steel ball in spring-like fashion with fast recovery speed (∼580 mm s−1), and demonstrates complete recovery and small energy dissipation (∼0.2) in each compress-release cycle, even under 90% strain. Particularly, the material can maintain structural integrity after more than 106 cycles at 20% strain and 2.5 × 105 cycles at 50% strain. This structural material, although constructed using an intrinsically brittle carbon constituent, is simultaneously super-elastic, highly compressible and fatigue resistant to a degree even greater than that of previously reported compressible foams mainly made from more robust constituents. Low-density compressible materials often suffer from fatigue-induced failure or limited elasticity. Here, the authors create a hierarchical multi-arch carbon material that achieves high compressibility, superior elasticity and fatigue resistance simultaneously, inspired by properties of arches in daily life.
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