氧化锌晶须辅助增强复合材料压缩性能

Compressive mechanical properties of ZnO whiskers secondary reinforced composites

采用万能实验机和分离式Hopkinson压杆装置(SHPB)为加载手段,对5种不同质量分数的ZnO晶须辅助增强玻璃纤维/环氧树脂复合材料层合板厚度和平面内2个方向的准静态和动态压缩性能进行了实验研究,分别得到了5种材料的压缩应力应变曲线;采用SEM对材料断口进行了宏、细观观察,对其破坏机制进行了初步研究。结果表明:该类材料具有明显的非线性特征的本构关系和应变率强化效应,在厚度和平面内2个方向的压缩破坏也具有完全不同的复杂的破坏机制,同时还发现试样的压缩强度和失效应变与氧化锌晶须的质量分数有关。

The quasi-static and dynamic compressive properties of glass-fiber polymer composites embedded with different mass fractions ZnO whiskers were investigated by an Instron testing machine and a split-Hopkinson pressure bar in the normal direction and the in-plane direction,respectively.In each direction,the stress-strain curve was obtained and the failure mechanism of materials was investigated by the macroscopic and microscopic observation of fractured specimens.The experimental results show that the materials have obvious non-linear constitutive relation and strain rate strengthening effects.The specimens have various failure modes,in each direction.The peak stress and failure strain of the specimens are both related with the mass fraction of ZnO whiskers.