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Size-dependent deformation behavior of nanocrystalline graphene sheets

机译:纳米晶石墨烯片的尺寸依赖性变形行为

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摘要

Molecular dynamics (MD) simulation is conducted to study the deformation behavior of nanocrystalline graphene sheets. It is found that the graphene sheets have almost constant fracture stress and strain, but decreased elastic modulus with grain size. The results are different from the size-dependent strength observed in nanocrystalline metals. Structurally, the grain boundaries (GBs) become a principal component in two-dimensional materials with nano-grains and the bond length in GBs tends to be homogeneously distributed. This is almost the same for all the samples. Hence, the fracture stress and strain are almost size independent. As a low-elastic-modulus component, the GBs increase with reducing grain size and the elastic modulus decreases accordingly. A composite model is proposed to elucidate the deformation behavior.
机译:进行了分子动力学(MD)模拟研究纳米晶石墨烯片的变形行为。发现石墨烯片具有几乎恒定的断裂应力和应变,但是弹性模量随晶粒尺寸而降低。结果与在纳米晶体金属中观察到的尺寸依赖性强度不同。在结构上,晶界(GBs)成为具有纳米晶粒的二维材料的主要成分,并且以GBs为单位的键长趋于均匀分布。对于所有样本,这几乎是相同的。因此,断裂应力和应变几乎与尺寸无关。作为低弹性模量的组分,GBs随着减小的晶粒尺寸而增加,并且弹性模量相应地降低。提出了一个复合模型来阐明变形行为。

著录项

  • 来源
    《Materials Science and Engineering》 |2015年第8期|95-101|共7页
  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China;

    College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, Shaanxi, China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China,Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;

    Faculty of Food Science and Engineering, Beijing University of Agriculture, Beijing Key Laboratory of Agricultural Product Detection and Control of Spoilage Organisms and Pesticide Residue, Beijing Laboratory of Food Quality and Safety, Beijing 102206, China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China,Department of Physics and Opt-electronic Engineering, Xi'an University of Arts and Science, Xi'an 710065, Shaanxi, China;

    Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanocrystalline graphene; Deformation behavior; Grain-size effect; Molecular dynamics simulation;

    机译:纳米晶石墨烯;变形行为;粒度效应;分子动力学模拟;

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