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arXiv 1401.0280cond-mat.mtrl-sci
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轴压作用下嵌入式单层石墨烯的破坏过程

Failure Processes in Embedded Monolayer Graphene under Axial Compression

Charalampos Androulidakis, Emmanuel N. Koukaras, Otakar Frank, Georgia Tsoukleri, Dimitris Sfyris, John Parthenios, Nicola Pugno, Konstantinos Papagelis, Kostya… 展开作者

Charalampos Androulidakis, Emmanuel N. Koukaras, Otakar Frank, Georgia Tsoukleri, Dimitris Sfyris, John Parthenios, Nicola Pugno, Konstantinos Papagelis, Kostya S. Novoselov, Costas Galiotis

摘要:

将剥离的单层石墨烯薄片嵌入聚合物基质中并在轴向压缩下加载。通过监测载荷下不同尺寸矩形薄片的二维拉曼声子的位移,确定了临界破坏应变。在加载之前,注意薄片的检查区域没有残余应力。发现第一次失效的临界应变值与薄片尺寸无关,平均值为-0.60%,对应于-6 GPa的屈服应力。通过将欧拉力学与温克勒方法相结合,我们表明,与空气中的屈曲不同,聚合物约束的存在导致石墨烯在固定的应变值下屈曲,估计皱纹波长为1-2 nm。这些结果进行了比较与DFT计算模拟晕苯/ PMMA低聚物,并获得了合理的协议。

英文摘要:

Exfoliated monolayer graphene flakes were embedded in a polymer matrix and loaded under axial compression. By monitoring the shifts of the 2D Raman phonons of rectangular flakes of various sizes under load, the critical strain to failure was determined. Prior to loading care was taken for the examined area of the flake to be free of residual stresses. The critical strain values for first failure were found to be independent of flake size at a mean value of -0.60 % corresponding to a yield stress of -6 GPa. By combining Euler mechanics with a Winkler approach, we show that unlike buckling in air, the presence of the polymer constraint results in graphene buckling at a fixed value of strain with an estimated wrinkle wavelength of the order of 1-2 nm. These results were compared with DFT computations performed on analogue coronene/ PMMA oligomers and a reasonable agreement was obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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