摘要
针对光纤光栅传感器疲劳性能不佳制约其工程化应用的问题,该文对一种高疲劳玻璃纤维增强聚合物(glassfiber reinforced plastic,GFRP)封装的光纤光栅应变传感器进行疲劳性能研究。首先,介绍该传感器的结构型式,并进行静态性能标定。然后,通过疲劳实验研究传感器在长期荷载作用下的疲劳性能,设置应变为10 000,8 000,7 000,6 000,2 000με,采用等幅正弦波加载方式,加载频率为10 Hz。实验结果表明:传感器的非线性误差均小于2%,重复性误差均小于0.5%,灵敏度系数略有波动,其值均小于2%,在6 000με条件下疲劳寿命可达200万次以上。传感器各项性能参数满足结构长期安全监测需求,具有较高的抗疲劳能力。最后给出的传感器疲劳寿命曲线,可为传感器剩余寿命预报及传感器的更换提供参考。
The fatigue property of FBG sensors restricts their engineering application. The fatigue performance of a FBG sensor packaged by GFRP is studied. First, the structure of the sensor is introduced and its static performance is calibrated. Then, the fatigue property of the sensor under long-term loading is studied by fatigue test. The strain is set at 10 000, 8 000, 7 000, 6 000, 2 000 με with equal amplitude sine wave, the loading frequency is 10 Hz. The results show that nonlinear errors are all less than 2% and repeatability errors are all less than 0.5%. The sensitivity coefficient fluctuates slightly, but it does not exceed 2%. Under the condition of 6 000 με, the fatigue life can reach more than 2 million times, which meet the demand of sensorapplications, the sensor has high fatigue resistance. At last, a fatigue life curve is obtained, which can provide reference for the prediction of sensor remaining life and the replacement.
引文
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