使用Hopkinson 压杆对玻璃纤维增强气凝胶进行动态压缩实验, 用扫描电子显微镜研究气凝胶破坏机理. 结果表明, 气凝胶的动静态应力应变曲线均包括弹性区、屈服区和致密化区, 气凝胶在屈服区出现塑性屈服的特征. 气凝胶的应变率强化效应明显. 气凝胶对入射波的整形作用导致输入杆承载应力的幅值明显降低, 承载应力的时间延长. 在高应变率条件下, 气凝胶中的玻璃纤维几乎全部断裂, 与基体分离, 气孔急剧收缩. 气凝胶在动态压缩下的粉碎破坏是气凝胶轴向压应力和内部横向张应力升高所共同导致的.
The dynamic mechanical property of glass fiber reinforced aerogel was investigated using a spilt Hopkinson pressure bar. Failure mechanism of aerogel was studied by scanning electron microscopy (SEM). The result showed that the quasi-static and dynamic stress-strain curves contained three regions: an elastic region, a yield region and a densification region. In the yield region, the compressive stress-strain curve showed plastic yield characteristics. The compressive behaviors of aerogel displayed a remarkable strain rate strengthening effect. Incident wave shaping using aerogel led to the decrease of stress on the incident bar and the increase of stress duration time on the incident bar. Under high strain rates, the glass fibers broke down and separated from matrix, and the pores shrank rapidly. Failure was due to the increase of axial compressive stress and lateral tensile stress under dynamic compression.
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