Effects of mixed micro and nano silica particles on the dynamic stiffness, stress transmissibility, and energy absorption of the epoxy composite were investigated using the split Hopkinson pressure bars. It was found that the dynamic stiffness significantly increased with silica weight fraction regardless of its sizes and composition ratio. However, the effect became less significant as the temperature approached T g . It was also found that mixed micro and nano silica particles decreased both the epoxy dynamic stiffness and the stress transmissibility, and increased the energy absorption. The optimum composition ratio was found to maximize the energy absorption while maintaining high stiffness performance of epoxy. The results obtained in the present work can be used to design the performance of epoxy/silica adhesive for appropriate applications.

中文翻译：

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纳米和纳米二氧化硅混合颗粒对环氧胶粘剂动态压缩性能的影响

使用分开的霍普金森压力棒研究了混合的微米和纳米二氧化硅颗粒对环氧复合材料的动态刚度，应力传递率和能量吸收的影响。发现，无论其尺寸和组成比如何，动态刚度均随二氧化硅重量分数而显着增加。但是，随着温度接近T g，影响变得不那么明显。还发现混合的微米和纳米二氧化硅颗粒降低了环氧树脂的动态刚度和应力传递性，并增加了能量吸收。发现最佳的组成比使能量吸收最大化，同时保持环氧树脂的高刚度性能。