基于光纤布拉格光栅的复合材料振动性能研究与损伤监测

STUDY ON VIBRATION PERFORMANCE AND DAMAGING DETECTION OF COMPOSITE MATERIALS BASED ON FBG

采用光纤布拉格光栅(FBG)对碳纤维增强复合材料(CFRP)的振动性能和损伤类型进行研究。采用落球击打碳纤维增强复合材料悬臂梁自由端,使复合材料悬臂梁产生谐振。通过测量复合材料悬臂梁的谐振频率,计算其阻尼损耗因子,得到无损伤碳纤维复合材料的振动性能。在此基础上,对碳纤维增强复合材料人为引入损伤,利用FBG测量其损伤状态下的谐振频率,依据谐振频率分析判断损伤类型。研究结果可对碳纤维增强复合材料的振动性能研究和损伤监测提供参考。

In this paper,the vibration performance and damage types of carbon fiber composite materials were investigated based on FBG sensing technology.The free end of a carbon fiber composite cantilever beam was hit by a falling ball to generate a resonance in the cantilever.The resonance frequency was measured and the damping loss factor was calculated based on the vibration characteristic of the carbon fiber composite.Then,a man-made damage（a small hole） was introduced into the cantilever and the resonance frequency was measured again.The result was compared with the frequency without damage,so that the damage type could be judged.Finally,the results of the research will provide a reference to the study of the vibration performance and damage monitoring of carbon fiber composite materials.