基于光纤光栅传感器的玻璃纤维复合材料层间应变测试的实验分析  

Experimental Analysis of Strain between Layers of Glass-Fiber Reinforced Composite Materials

作　　者：沈维亮[1] 朱启荣[2,1] 解明如[1] 

机构地区：[1]同济大学航空航天与力学学院,上海200092 [2]同济大学国家力学实验教学示范中心,上海200092

出　　处：《力学季刊》2013年第3期463-469,共7页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(11272239);同济大学中央高校基本科研业务费专项资金(2012-058)

摘　　要：通过对内埋未封装光纤光栅传感器(Fiber Bragg Grating,FBG)的玻璃纤维增强复合材料进行力学实验分析,得到不同试件层间的应变曲线与试件断面的微观截面图。探讨了玻璃纤维复合材料固化过程中温度和压力对FBG传感器的传感性能的影响,深入分析了FBG传感器与玻璃纤维复合材料的融合度以及弯曲实验中FBG传感器检测精度。在试件三点弯曲实验中,与传统电测方法不同,应用新型未封装FBG传感器进行复合材料的层间应变测量,得到的层间应变与载荷数据,拟合直线的线性相关系数均在0.99以上,并且传感器在监测不同试件同一层的层间应变的相对误差不超过5%。为应用FBG传感器检测实际的复合材料构件内部应变以及形成FBG传感网络损伤监测系统提供了实验基础。Based on the study about the mechanical experiment of unpackaged Fiber Bragg Grating sensors embedded in glass-fiber reinforced composite materials, strain curves between layers and microcosmic sectional diagrams of different test specimen were obtained. The influence of the temperature and pres- sure in the curing process of glass-fiber reinforced composite materials to the FBG sensors＇ sensing prop- erty was discussed, and the questions about the degree of fusion between FBG sensors and glass-fiber re- inforced composite materials and the measurement accuracy of the FBG sensors in the test specimen＇s bending experiment were also studied. Different from traditional electrical measurement method, it is found that in the three-point bending experiment, the strain between layers monitored by the FBG sensors has a good linear relationship with the load, the correlation coefficients of the fitting lines are over 0.99, and the relative errors of strain between the same layers of different specimens monitored by FBG sensors are less than 5 %, which supplies experimental foundation for the accurate strain measurement of the composite material structures and the formation of a damage detection system based on FBG sensing, netwnrk.

关 键 词：光纤光栅传感器 应变传感 复合材料 弯曲实验 

分 类 号：O348.9[理学—固体力学]