采用环氧树脂材料作为试验载体,使用没有任何保护性封装的、运用波分复用技术在同一光纤上刻入三个布拉格光栅的基础FBG传感器,来监测液体树脂流动及固化成型的全过程,并使用固化成型的环氧树脂板进行三点弯曲试验。将所得数据与有限元模拟数值解进行比较,来验证在去除封装、将传感器自身应变影响降到最低的情况下,FBG传感网络是否依然能够有效地反映出试验对象在各种情况下的内部应变。本文给出了FBG光纤光栅在逐级静力荷载加载下材料内部三点弯曲的应变图,并通过数值计算分析了未封装光纤在复合材料内部受力过程中的力学性能。 Epoxy resin is used as a test carrier, and a basic FBG sensor with three Bragg gratings embedded on the same optical fiber by using WDM technology without any protective package is used to monitor the whole process of liquid resin flow and curing. A three-point bending test was conducted using a cured epoxy board. The obtained data are compared with the numerical solution of the finite element simulation to verify whether the FBG sensor network can still effectively reflect the subjects’ internal under various conditions without removing the package and minimizing the influence of the strain of the sensor itself strain. In this paper, the strain curves of three-point bending of FBG fiber gratings under gradual static loading are given. The mechanical properties of the uncoated fiber in the internal stress of the composite are analyzed by numerical calculation.