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为了确定复合材料热压釜成型过程中弯曲力矩对EFPI光纤传感器测试性能的影响,制作了将光纤传感器埋入FRP层合板中间层的试验片,并对试验片进行三点弯曲试验,得到了弯曲力矩与传感器输出应变的对应关系。用显微镜观察层合板的截面,确定光纤传感器的埋入位置。对传感器的埋入位置偏离层合板中间层的试验片,运用有限元应变解析法计算了其应变值。结果表明,光纤传感器的埋入位置偏离层合板的中间层时,传感器的输出应变值大于解析值,说明弯曲力矩会影响光纤传感器的测试性能。
In order to determine the influence of the bending moment on the test performance of EFPI optical fiber sensor during the molding process of composite autoclave, the optical fiber sensor was embedded into the middle layer of FRP laminates. The three-point bending test of the optical fiber sensor was performed to obtain the bending Correspondence between torque and sensor output strain. The cross section of the laminate was observed with a microscope to determine the embedding position of the optical fiber sensor. The strain value of the sensor was calculated by using the finite element method of strain analysis. The results show that when the position of the optical fiber sensor is deviated from the middle layer of the laminate, the output strain of the sensor is larger than the analytical value, which indicates that the bending moment will affect the testing performance of the optical fiber sensor.