光纤光栅传感器应变传递影响参数研究
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摘要
当光纤光栅传感器埋设在结构中或粘贴于结构表面后,由于中间层的存在使结构的真实应变和光纤光栅传感器所测得的应变之间存在一个传递系数。在已有的应变传递理论的基础上,经过分析得出影响光纤光栅传感器应变传递的主要因素,它们是光纤光栅传感器的长度、中间层的厚度、弹性模量和泊松比。结果表明,光纤光栅传感器平均应变传递随着传感器长度的增加而升高,随着中间层厚度的增大而降低,随着中间层的弹性模量的增加而增大;中间层的泊松比对平均应变传递率的影响很小,在设计中可以忽略。
Optic fiber Bragg grating sensor requires a strain transfer coefficient when it is embedded in or adhered to the structure due to an interlayer between structure and sensor. The important factors that affect the strain transferring are deduced on the basis of existent theory in this paper, which include the length of the sensor, the thickness, Young’s modulus and Poisson’s ratio of the interlayer. The relationship between the average strain transfer rate and the parameters is discussed. The results show that the average strain transfer rate increases with sensor length, decreases with the thickening of the interlayer, rises with the increase of the interlayer Young’s modulus. The influence of the interlayer Poisson ratio on the average strain transfer rate is very small and it can be neglected when choosing the interlayer parameters.
Optic fiber Bragg grating sensor requires a strain transfer coefficient when it is embedded in or adhered to the structure due to an interlayer between structure and sensor. The important factors that affect the strain transferring are deduced on the basis of existent theory in this paper, which include the length of the sensor, the thickness, Young’s modulus and Poisson’s ratio of the interlayer. The relationship between the average strain transfer rate and the parameters is discussed. The results show that the average strain transfer rate increases with sensor length, decreases with the thickening of the interlayer, rises with the increase of the interlayer Young’s modulus. The influence of the interlayer Poisson ratio on the average strain transfer rate is very small and it can be neglected when choosing the interlayer parameters.
引文
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[3]Sun Li,Li Hongnan,Ren Liang.Experiment study on shrink strain monitoring of concrete in the cure period with FBG sensors[A].ASME,PVP,2005.71~91.
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[10]高庆,康国正.短纤维复合材料应力传递的修正剪滞理论[J].固体力学学报,2000,21(3):198~204.Gao Qing,Kang Guozheng,The revised shear-lag theory for stress transfer in short fiber composites[J].Acta Mechanica Solida Sinica,2000,21(3):198~204.(in Chinese)
[11]Li Dongsheng,Li Hongnan.Strain transfer of fiber Bragg grating sensors[J].Optical Engineering,2006,45(2):402~409.(to appear).
[12]李东升,李宏男.埋入式封装的光纤光栅传感器应变传递分析[J].力学学报,2005,37(4):435~441.Li Dongsheng,Li Hongnan.Strain transferring analysis of embedded fiber Bragg grating sensors[J].Chinese Journal of Theoretical and Applied Mechanics,2005,37(4):435~441.(in Chinese)
[2]李宏男,李东升,赵柏东.光纤健康监测方法在土木工程中的研究与应用进展[J].地震工程与工程振动,2002,22(6):76~83.Li Hongnan,Li Dongsheng,Zhao Baidong.Progress on study and application of smart health monitoring method by fiber optic sensor in civil engineering[J].Earthquake Engineering and Engineering Vibration,2002,22(6):76~83.(in Chinese)
[3]Sun Li,Li Hongnan,Ren Liang.Experiment study on shrink strain monitoring of concrete in the cure period with FBG sensors[A].ASME,PVP,2005.71~91.
[4]Li Dongsheng,Li Hongnan,Ren Liang,Sun Li,Zhou Jing.Experiments on an offshore platform model by FBG sensors[A].Sensors and Smart Structures Technologies for Civil,Mechanical and Aerospace Systems,Proceedings of SPIE–The International Society for Optical Engineering,2004,5391:100~106.
[5]胡曙阳,赵启大,何士雅.金属管装光纤光栅用于建筑钢筋应变测量[J].光电子?激光,2004,15(6):688~690.Hu Shuyang,Zhao Qida,He Shiya.Strain measurement in construction steel bar using a FBG sensor coated by a thin metal tube[J].Journal of Optoelectronics·Laser,2004,15(6):688~690.(in Chinese)
[6]赵雪峰,田石柱,周智.钢片封装光纤光栅检测混凝土应变试验研究[J].光电子?激光,2003,14(2):171~174.Zhao Xue-feng,Tian Shizhu,Zhou Zhi.Experimental study on strain monitoring of concrete using a steel slice packaged fiber grating[J].Journal of Optoelectronics·Laser,2003,14(2):171~174.(in Chinese).
[7]赵占朝,刘浩吾,蔡德所.光纤传感无损检测混凝土结构研究述评[J].力学进展,1995,25(2):223~231.Zhao Zhanchao,Liu Haowu,Cai Desuo.Study on lossless monitoring of concrete structure using fiber sensor[J].Advances in Mechanics,1995,25(2):223~231.(in Chinese)
[8]Pak Y E.Longitudinal shear transfer in fiber optic sensors[J].Smart Materials and Structures,1992,1:57~62.
[9]Farhad Ansari,Yuan Libo.Mechanics of bond and interface shear transfer in optical fiber sensors[J].Journal of Engineering Mechanics,1998,4:385~394.
[10]高庆,康国正.短纤维复合材料应力传递的修正剪滞理论[J].固体力学学报,2000,21(3):198~204.Gao Qing,Kang Guozheng,The revised shear-lag theory for stress transfer in short fiber composites[J].Acta Mechanica Solida Sinica,2000,21(3):198~204.(in Chinese)
[11]Li Dongsheng,Li Hongnan.Strain transfer of fiber Bragg grating sensors[J].Optical Engineering,2006,45(2):402~409.(to appear).
[12]李东升,李宏男.埋入式封装的光纤光栅传感器应变传递分析[J].力学学报,2005,37(4):435~441.Li Dongsheng,Li Hongnan.Strain transferring analysis of embedded fiber Bragg grating sensors[J].Chinese Journal of Theoretical and Applied Mechanics,2005,37(4):435~441.(in Chinese)
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