GFRP封装光纤光栅应变传感器疲劳性能研究
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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.
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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[2]JIANG M S,SUI Q M.Application of fiber brag grating sensor network in aluminum reduction tank shell temperature monitoring[J].Journal of Central South University,2013,20(4):924-930.
[3]何锐,吴文飞,陈华鑫,等.光纤光栅传感器在道路测试及工程应用的研究进展[J].硅酸盐通报,2017,36(6):1911-1920.
[4]万里冰,李凯旋.FBG应变传感器的疲劳性能研究[J].传感器与微系统,2015,34(12):13-15.
[5]PEREIRA G,FRIAS C,FARIA H,et al.On the improvement of strain measurements with FBG sensors embedded in unidirectional composites[J].Polymer Testing,2013,32(1):99-105.
[6]舒岳阶,吴俊,周世良,等.FBG应变传感器应力疲劳极限传感寿命评估方法[J].光子学报,2017,42(1):1-6.
[7]王倩.复杂受力状态光纤光栅应变传递及工程化设计[D].大连:大连理工大学,2016.
[8]陈昊,闫光,庄炜,等.光纤光栅应变传感器预紧封装及传感特性研究[J].激光与红外,2016,46(9):1128-1132.
[9]李科.基于光纤Bragg光栅技术的沥青路面动载测试分析的试验研究[D].南京:南京航空航天大学,2012.
[10]罗小东,乔学光,冯德全,等.基于碳纤维复合材料FBG加速度传感器[J].光通信技术,2016,40(7):47-49.
[11]吴智深,唐永圣,黄璜.利用自传感FRP筋实现结构性能全面监测和自诊断研究[J].建筑结构,2013(19):5-9.
[12]李冬生,周智,欧进萍.FRP-FBG桥梁智能拉索开发和传感特性研究应用[J].预应力技术,2013(2):3-7.
[13]田石柱,曹长城,王大鹏.光纤光栅传感器监测混凝土简支梁裂缝的实验研究[J].中国激光,2013,40(1):218-222.
[14]魏谦.应用在建筑工程中的基于光纤传感技术的应变传感器研究[D].济南:山东建筑大学,2015.
[15]土木工程用光纤光栅温度传感器:JG/T 421-2013[S].北京:中国标准出版社,2013.