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首页> 美国卫生研究院文献>Polymers >Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets on the Monotonic and Fatigue Properties of Uncracked and Cracked Epoxy Composites
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Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets on the Monotonic and Fatigue Properties of Uncracked and Cracked Epoxy Composites

机译：多壁碳纳米管和石墨烯纳米孔对未粘土和裂化环氧复合材料单调和疲劳性能的协同作用

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摘要

The fatigue properties of the polymer nanocomposites reinforced with a hybrid nano-filler system have seldom studied before. Accordingly, epoxy nanocomposites with various multi-walled carbon nanotube (MWCNT)/graphene nanoplatelet (GNP) filler ratios were prepared to study comprehensively the synergistic effect of the hybrid nano-fillers on the monotonic and cyclic mechanical properties of the nanocomposites. The quasi-statically tensile properties and fatigue-life curves were experimentally determined using uncracked bulk specimens. Additionally, pre-cracked specimens were utilized to study the fracture toughness and fatigue crack growth rate of the nanocomposites. A synergistic index based on the properties of the nanocomposites with individual types of filler was proposed to evaluate the synergistic effect of two employed nano-fillers on the studied properties. The index was verified to be a highly discriminatory tool to evaluate the synergistic effect of hybrid nano-fillers on the studied mechanical properties. The experimental results show that the composites with a MWCNT:GNP ratio of 1:9 have the higher monotonic and fatigue properties than those with other filler ratios. Adding appropriate amount of CNTs can prevent the agglomeration of GNPs. The flexible CNTs bridge adjacent GNPs to constitute a favorable network for load transfer. Moreover, there is a linear relationship between the static and fatigue strengths of the studied nanocomposites. Integrated analysis of experimental data and a fracture surface study reveals that the dispersion of nano-fillers influences the mechanical properties significantly. The crack deflection effect due to the path bifurcation caused by encountering the filler cluster and the filler bridging effect are the main reinforcement mechanism of the studied properties.
机译：用杂交纳米填充系统加强的聚合物纳米复合材料的疲劳性能很少研究。因此，制备具有各种多壁碳纳米管（MWCNT）/石墨烯纳米丙烯片（GNP）填充比的环氧纳米复合材料，以全面研究杂化纳米填料对纳米复合材料的单调和环状机械性能的协同作用。使用未包埋的散装样品实验确定准静态拉伸性能和疲劳寿命曲线。另外，利用预破裂的标本来研究纳米复合材料的断裂韧性和疲劳裂纹生长速率。提出了一种基于具有各种类型填料的纳米复合材料性质的协同指数，以评估两种使用的纳米填料对所研究的性质的协同效应。该指数被验证为高度辨别的工具，以评估杂化纳米填料对所研究的机械性能的协同作用。实验结果表明，具有MWCNT的复合材料：GNP比为1：9的单调和疲劳性能高于其他填充比的单调和疲劳性能。添加适量的CNT可以防止GNP的聚集。柔性CNTS桥相邻的GNP构成负载转移的有利网络。此外，研究了纳米复合材料的静态和疲劳强度之间存在线性关系。实验数据的综合分析和裂缝表面研究表明，纳米填料的分散显着影响机械性能。由于遇到填充簇和填料桥接效果而导致的裂缝挠曲效果是所研究性质的主要增强机构。

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