华南理工大学学报(自然科学版)

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基于分子动力学的石墨烯/ 碳化硅复合材料力学性能研究

湛家铭 姚小虎 李旺辉   

  1. 华南理工大学 土木与交通学院,广东 广州 510640
  • 收稿日期:2017-01-16 出版日期:2017-05-25 发布日期:2017-04-01
  • 通信作者: 姚小虎( 1974-) ,男,博士,教授,主要从事计算力学方法和分子模拟研究. E-mail:yaoxh@scut. edu. cn
  • 作者简介:湛家铭( 1993-) ,男,博士生,主要从事计算力学方法和分子模拟研究. E-mail:zhan.jm@mail.scut.edu.cn
  • 基金资助:
    国家自然科学基金资助项目( 11672110, 11372113)

A Probe into Mechanical Properties of Graphene/ SiC Composites Based on Molecular Dynamics

ZHAN Jia-ming YAO Xiao-hu LI Wang-hui   

  1. School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2017-01-16 Online:2017-05-25 Published:2017-04-01
  • Contact: 姚小虎( 1974-) ,男,博士,教授,主要从事计算力学方法和分子模拟研究. E-mail:yaoxh@scut. edu. cn
  • About author:湛家铭( 1993-) ,男,博士生,主要从事计算力学方法和分子模拟研究. E-mail:zhan.jm@mail.scut.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China( 11672110, 11372113)

摘要: 为揭示复合材料在拉伸过程中的破坏机理,对石墨烯/碳化硅复合材料的拉伸力学性能进行了分子动力学模拟. 研究结果表明: 石墨烯与碳化硅接触的界面结构会影响复
合材料的整体力学性能; 相较于纯碳化硅,石墨烯/碳化硅复合材料在拉伸时,损伤更容易在界面处成核并生长; 当石墨烯与碳化硅通过不同界面接触时,石墨烯与基底之间的不同相互作用使复合材料有不同的力学性能,相较于石墨烯直接与碳化硅的C 表面接触,当石墨烯与Si 原子接触时复合材料有更高的强度和失效应变.

关键词: 分子动力学, 石墨烯, 单轴拉伸, 复合材料, 力学性能, 界面影响

Abstract: In order to discover the underlying mechanisms of tensile fracture of composites,the tensile mechanical properties of graphene /SiC composites are simulated on the basis of molecular dynamics ( MD) .The results show that ( 1) the interface between graphene and SiC may affect the mechanical properties of the whole composite systems; ( 2) in comparison with the damage of bulk SiC systems,the damage of the composites tends to nucleate and grow on the interface in the tension process; ( 3) graphene /SiC composites with different interface structures possess different mechanical behaviors due to the various interaction between graphene and SiC; and ( 4) in comparison with the contact of grapheme sheet with C surface,the direct contact of single graphene sheet with Si in the substrate results in higher strength and failure strain.

Key words: molecular dynamics, graphene, uniaxial tension, composite, mechanical property, interface effect