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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。
Through the mechanical experiment analysis of the glass fiber reinforced composites embedded in the un-packaged Fiber Bragg Grating (FBG), the strain curves of the different specimen layers and the microscopic cross section of the specimen cross section are obtained. The influence of temperature and pressure on the sensing performance of FBG sensor was discussed. The fusion degree between FBG sensor and glass fiber composites and the detection accuracy of FBG sensor in bending test were analyzed. In the three-point bending test of the specimen, different from the traditional electric measurement method, the new un-packaged FBG sensor was used to measure the interlaminar strain of the composite material. The linear correlation coefficient of the interlaminar strain and the load data obtained was fitted to 0.99 , And the relative error of the sensor in monitoring the strain of the same layer in different samples does not exceed 5%. It provides an experimental basis for the application of FBG sensor to detect the actual internal strain of composite materials and to form the FBG sensor network damage monitoring system.