Banarouei Seyed Arman, Yu Luxia, Jian Cuiying
Department of Mechanical Engineering, York University, Toronto, ON M3J 1P3, Canada.
Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO 80309, United States of America.
Nanotechnology. 2021 Mar 19;32(23). doi: 10.1088/1361-6528/abeb3b.
Due to its superior mechanical properties, graphene is widely used as reinforcement materials in nanocomposites. In this work, a series of indentation simulations was performed, using finite element method, to investigate the mechanical properties of graphene/TiOand graphene/SnOnanocomposite films. The force-displacement curves obtained from simulations were first compared to analytical results, which demonstrates that with increasing the thicknesses of metal oxide layers, the mechanical responses of nanocomposites exhibit a transition from non-linear behaviors to linear behaviors. Furthermore, consistent with literature works, increasing graphene volume fraction can enhance the Young's modulus of the corresponding heterostructure. Interestingly, this enhancement can be modulated by nuances in stacking orders, i.e. layer arrangements, of nanocomposites. Through analyzing stress and strain distributions, the underlying mechanisms were proposed. Our results reported here provide comprehensive characterizations and understandings on the reinforcement effects of graphene on graphene/metal oxide nanocomposites.
由于其优异的力学性能，石墨烯被广泛用作纳米复合材料中的增强材料。在这项工作中，使用有限元方法进行了一系列压痕模拟，以研究石墨烯/TiO和石墨烯/SnO纳米复合薄膜的力学性能。首先将模拟得到的力-位移曲线与分析结果进行比较，结果表明，随着金属氧化物层厚度的增加，纳米复合材料的力学响应呈现出从非线性行为到线性行为的转变。此外，与文献研究一致，增加石墨烯体积分数可以提高相应异质结构的杨氏模量。有趣的是，这种增强可以通过纳米复合材料堆叠顺序（即层排列）的细微差别来调节。通过分析应力和应变分布，提出了潜在的机制。我们在此报告的结果提供了关于石墨烯对石墨烯/金属氧化物纳米复合材料增强效果的全面表征和理解。
