两种不同微结构的高硅氧/酚醛树脂基复合材料动态压缩性能研究

Dynamic compressive properties of two high silica glass/phenolic composites with different microstructures

为获得高硅氧/酚醛树脂基复合材料动态压缩力学性能以及研究微结构对该种材料力学性能影响,利用分离式霍普金森压杆分别对两种不同微结构的高硅氧/酚醛树脂基复合材料进行动态压缩实验。实验结果发现,在相同应变率下,高硅氧丝/酚醛树脂基复合材料强度高于高硅氧布/酚醛树脂基复合材料。此外,实验结果还显示微结构对材料的失效模式有显著影响,高硅氧丝/酚醛树脂基复合材料显现出一种劈裂的失效模式,而高硅氧布/酚醛树脂基复合材料却发生剪切断裂。进一步通过对其断裂形貌分析指出,高硅氧玻璃纤维的排列方式决定复合材料的断裂模式。

In order to obtain the dynamic compressive properties of the high silica glass/phenolic composites and study the effect of microstructure on mechanical properties of this composite. This paper uses the split Hopkinson pressure bar to conduct dynamic compressive tests on the high silica glass/phenolic composites which have two different microstructures. The result shows that under the similar strain rate, the strength of high silica glass fiber/phenolic composite is higher than the high silica glass fabric/ phenolic composite. Furthermore, the mierostructure has significant effect on the failure mode of this composite. The high silica glass composite has a splitting failure mode, however, the high silica glass fabric composite indicates the shear failure mode. From the analysis on the fracture feature of the sample, it can be concluded that the frature mode of the composite is determined by the orientation of the high silica glass fiber.