In this paper, the effects of filler content and the use of hybrid nanofillers on agglomeration and nanocomposite mechanical properties such as elastic moduli, ultimate strength and elongation to failure are investigated experimentally. In addition, thermoset epoxy-based two-phase and hybrid nanocomposites are simulated using multiscale modeling techniques. First, molecular dynamics simulation is carried out at nanoscale considering the interphase. Next, finite element method and micromechanical modeling are used for micro and macro scale modeling of nanocomposites. Nanocomposite samples containing carbon nanotubes, graphene nanoplatelets, and hybrid nanofillers with different filler contents are prepared and are tested. Also, field emission scanning electron microscopy is used to take micrographs from samples’ fracture surfaces. The results indicate that in two-phase nanocomposites, elastic modulus and ultimate strength increase while nanocomposite elongation to failure decreases with reinforcement weight fraction. In addition, nanofiller agglomeration occurred at high nanofiller contents especially higher than 0.75 wt% in the two-phase nanocomposites. Nanofiller agglomeration was observed to be much lower in the hybrid nanocomposite samples. Therefore, using hybrid nanofillers delays/prevents agglomeration and improves mechanical properties of nanocomposite at the same total filler content.

中文翻译：

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测定两相和杂化纳米复合材料的力学性能：实验确定和多尺度建模

本文通过实验研究了填料含量和混合纳米填料的使用对团聚和纳米复合机械性能（如弹性模量，极限强度和破坏伸长率）的影响。此外，使用多尺度建模技术对热固性环氧基两相和杂化纳米复合材料进行了模拟。首先，考虑到中间相，在纳米尺度上进行分子动力学模拟。接下来，有限元方法和微机械建模被用于纳米复合材料的微观和宏观建模。制备并测试了包含碳纳米管，石墨烯纳米片和具有不同填料含量的杂化纳米填料的纳米复合材料样品。同样，场发射扫描电子显微镜用于从样品的断裂表面拍摄显微照片。结果表明，在两相纳米复合材料中，弹性模量和极限强度随增强重量分数的增加而降低，而纳米复合材料的破坏伸长率则降低。另外，纳米填料的团聚在高纳米填料含量下发生，尤其是在两相纳米复合材料中高于0.75wt％。在杂化纳米复合材料样品中观察到纳米填料的团聚要低得多。因此，使用混合纳米填料可延迟/防止团聚，并在相同的总填料含量下改善了纳米复合材料的机械性能。在两相纳米复合材料中为75 wt％。在杂化纳米复合材料样品中观察到纳米填料的团聚要低得多。因此，使用混合纳米填料可延迟/防止团聚，并在相同的总填料含量下改善了纳米复合材料的机械性能。在两相纳米复合材料中为75 wt％。在杂化纳米复合材料样品中观察到纳米填料的团聚要低得多。因此，使用混合纳米填料可延迟/防止团聚，并在相同的总填料含量下改善了纳米复合材料的机械性能。