温度和应变率对碳纤维平纹织物/环氧树脂层压复合材料压缩性能的影响

Effect of Temperature and Strain Rate on the Compression Behaviors of Carbon/Epoxy Plain Woven Laminated Composites

利用带有温度控制装置的分离式霍普金森杆(SHPB)测试碳纤维平纹织物/环氧树脂层压复合材料的冲击压缩性能,分析温度和应变率对碳纤维平纹织物/环氧树脂层压复合材料压缩性能的影响.结果表明:温度和应变率对碳纤维平纹织物/环氧树脂层压复合材料的面外冲击压缩模量、最大应力及破坏形态都有很大影响.随着温度的增加,纤维与树脂界面变弱,最大应力减小,压缩模量减小;随着应变率的增加,最大应力增加,压缩模量变大.通过扫描电子显微镜(SEM)观察发现,纤维与树脂界面在100℃时发生变化,有大量纤维束从经、纬纱中被拉出,导致纤维束无规则断裂.

The impact compressive properties of carbon/epoxy plain woven laminated composites were tested on the split Hopkinson pressure bar （SHPB） to analyze the effect of temperature and strain rate on the compressive properties of the composites. The results reveal that the temperature and strain rate have significant influences on the impact compression modulus, peak stress and failure morphology. With the increase of temperature, fiber-matrix interface becomes soft, which leads to peak stress and compression modulus decrease. And with the increase of strain rate, peak stress and compression modulus increase, as well. Through scanning electronic microscopy （SEM） observations, it was found that the change of fibermatrix interface was occurred at 100 ℃. There are abundant fibers pulled out from the warp and weft yarns, which makes the irregular fracture of fiber tows.