Microscopic deformation mechanism and main influencing factors of carbon nanotube coated graphene foams under uniaxial compression
Microscopic deformation mechanism and main influencing factors of carbon nanotube coated graphene foams under uniaxial compression
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碳纳米管涂覆石墨烯泡沫单轴压缩微观变形机制及主要影响因素
DOI：
10.1088/1361-6528/ac020c
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发表时间：
2021-05
期刊：
影响因子：
3.5
通讯作者：
S.H. Chen
中科院分区：
文献类型：
--
作者：
S. Wang;C. Wang;M.B. Khan;S.H. Chen
大量实验表明，碳纳米管包覆的石墨烯泡沫(CCGF)具有独特的力学性能，进一步拓展了石墨烯泡沫材料在许多先进领域的应用。为了揭示CCGF在单轴压缩下的微观变形机理和影响其力学性能的主要因素，本文基于粗粒分子动力学方法进行了系统的数值实验。研究发现，碳纳米管和石墨烯片材的相对刚度严重影响CCGFs的微观变形机制和应变分布。由较软的石墨烯薄片组成的CCGFs的微观变形以钢筋增强机制为主，而由刚性石墨烯薄片组成的CCGFs的微观组织变形以机械锁定机制为主。进一步研究了碳纳米管含量、碳纳米管在石墨烯薄片上的分布、石墨烯薄片的厚度以及碳纳米管与石墨烯薄片之间的粘接强度对泡沫材料初始和中间弹性模量的影响。本文的研究结果将有助于深入了解CCGF材料的力学性能和先进石墨烯基复合材料的微观结构优化设计。
Many experiments have shown that carbon nanotube-coated (CNT-coated) graphene foam (CCGF) has specific mechanical properties, which further expand the application of graphene foam materials in many advanced fields. To reveal the microscopic deformation mechanism of CCGF under uniaxial compression and the main factors affecting their mechanical properties, numerical experiments based on the coarse-grained molecular dynamics method are systematically carried out in this paper. It is found that the relative stiffness of CNTs and graphene flakes seriously affects the microscopic deformation mechanism and strain distribution in CCGFs. The bar reinforcing mechanism will dominate the microstructural deformation in CCGFs composed of relatively soft graphene flakes, while the microstructural deformation in those composed of stiff graphene flakes will be dominated by the mechanical locking mechanism. The effects of CNT fraction, distribution of CNTs on graphene flakes, the thickness of graphene flakes, and the adhesion strength between CNTs and graphene flakes on the initial and intermediate moduli of foam materials are further studied in detail. The results of this paper should be helpful for a deep understanding of the mechanical properties of CCGF materials and the optimization design of microstructures in advanced graphene-based composites.
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