论文部分内容阅读
内埋的光纤Bragg光栅(FBG)传感器的存活率及测试精度是其在线监测纤维增强树脂基复合材料制备和服役状态的重要前提。采用[9011/011]的碳纤维预浸料铺层方式,在层合板0°和45°方向的典型位置埋入FBG温度和应变传感器,采用模压成型工艺制备复合材料层合板。在异向铺排(光纤光栅方向与碳纤维方向不同)的45°方向光纤光栅传感器内埋于碳纤维预浸料层间的过程中,对其采用4种不同的保护方式。通过对比实验结果发现:当对异向铺排的FBG传感器不采取保护措施时,在加热加压复合材料时光纤光栅容易失活;整层铺设同向预浸料以保护异向铺排的FBG传感器的方式改变了具有特定铺层参数复合材料的力学性能;采用窄长条同向预浸料上下包埋保护FBG传感器的方式增大了应变光栅测量结果的系统误差;采用窄长条同向预浸料上下包埋并在邻近铺层开凹槽的保护方式能明显提高内埋光纤光栅的存活率及测试精度。
The survival and testing accuracy of embedded fiber Bragg grating (FBG) sensors are important preconditions for on-line monitoring the preparation and service status of fiber reinforced resin matrix composites. The FBG temperature and strain sensors were embedded in the typical positions of 0 ° and 45 ° direction of the laminates using carbon fiber prepreg lay-up [9011/011], and the composite laminates were prepared by compression molding. Four kinds of different protection methods are adopted in the process of embedding carbon fiber prepreg layers in a 45 ° directional fiber grating sensor with different orientation (fiber grating direction is different from carbon fiber direction). The results of the comparison experiment show that when the FBG sensor with different orientation is not protected, the FBG can be easily deactivated when heating and pressurizing the composite material. The same layer is laid with the same direction prepreg to protect the FBG sensor The way of changing the mechanical properties of composite materials with specific lay parameters; the way of embedding and protecting the FBG sensor with the upper and lower strips of narrow strip in the same direction increases the systematic error of the measurement results of the strain gauges; The protection method of embedding the material in the upper and lower layers and opening the groove in the adjacent ply can obviously improve the survival rate and the testing precision of the embedded optical fiber grating.