粘贴于结构物表面测量应变,是光纤布拉格光栅(fiber Bragg grating,FBG)的一种重要应用形式。在前人研究基础上,研究去除涂覆层的FBG的应变传递规律,并通过实验验证了理论分析结果。通过理论分析建立了纤芯层-粘结层-基体层的3层应变传递模型,运用仿真分析研究了粘结层剪切模量、光纤与基体之间的胶层厚度、光纤粘贴长度和宽度以及光纤上部胶层厚度对平均应变传递率的影响,分析了影响应变传递的主要因素,提出了增大应变传递率的方法,为表面粘贴式裸光纤光栅的应用提供了重要参考。实验中选用 LOCTITE 401胶粘剂将裸光纤光栅粘贴于等强度梁上,通过应变测量实验验证了模型的准确性和有效性,实验中去除涂覆层的裸光纤光栅的平均应变传递率高达96％以上,与理论模型计算值相比误差在1％左右,很好地证明了裸光纤光栅用于应变测量的准确性和可行性。
One of the important application forms of FBG is to measure strain by pasting on the surface of struc-ture.On the basis of previous studies,this paper used the kind of FBG whose coating layer is removed as the re-search obj ect to study the strain transfer principle,and the theoretical analysis results are verified by experi-ments.Through the theoretical analysis,this article establishes a three-layer strain transfer model which in-cludes fiber core,glued layer and matrix structure.At the same time,the paper uses the simulation analysis to study the shear modulus of adhesive layer,the adhesive layer thickness between the fiber and matrix,and the effects of the fiber length,width and thickness of adhesive above the fiber on the average strain transfer rate. This article analyzes the main factors that influence strain transfer and puts forward the method to increase the strain transfer rate,which provides an important reference for the application of surface pasted the bare fiber grating.The experiment uses a LOCTITE 401 adhesive to paste the bare fiber Bragg grating on the cantilever beam.Through the strain measurement experiments,the author proves the correctness and validity of the mod-el.And the average transfer rate of removing the bare fiber grating coating is as high as 96%,which only has a-round 1% error with the calculation of the theoretical model.This experiment well proves the accuracy and fea-sibility of the bare fiber grating used for strain measurement.
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