高技术通讯2013，Vol.23Issue(5)：513-518,6.DOI:10.3772/j.issn.1002-0470.2013.05.011
非轴向力下粘贴式FBG传感器应变传递机制研究
Strain transfer mechanism analysis of a surface-bonded FBG sensor under non-axial force
摘要
Abstract
The relationship in structural health monitoring between the strain measured by a surface-bonded fiber Bragg grating (FBG) sensor and the actual strain of the matrix structure when the direction of the sensor axis is at a certain angle to the main stress direction of the matrix structure was investigated.The strain transfer equation and the theoretical strain-transfer model of a surface-bonded FBG sensor were established,and the strain transfer rate along the sensor gauge,the maximum strain transfer rate and the average strain transfer rate were obtained.The validation of the theoretical model was verified by the finite element method (FEM),and the change of the average strain transfer rate with the sensor angle was obtained by the parameter analysis.The results of the study show that the average strain transfer rate decreases with the increase of the sensor angle.When the sensor angle is zero,the average strain transfer rate is the largest,and its equation form is the same as the axial force case.Therefore,the theoretical model could be attributed to the general expression.When the sensor angle is 90°(the direction of the sensor axis is vertical to the principal stress direction of the matrix structure),the average strain transfer rate drops to zero.In this case,the measurement result is invalid.The theoretical model and simulation results are of referential significance to guiding the practical application of the surface-bonded FBG sensor in structural health monitoring.关键词
光纤布拉格光栅(FBG)传感器/非轴向力/粘贴式/应变传递/平均应变传递率Key words
fiber Bragg grating (FBG) sensor/ non-axial force/ surface-bonded/ strain transfer/ average strain transfer rate引用本文复制引用
李银玉,邱野,王全保,赵海涛..非轴向力下粘贴式FBG传感器应变传递机制研究[J].高技术通讯,2013,23(5):513-518,6.基金项目
863计划(2011AA7051001)和国家自然科学基金(51205253)资助项目. （2011AA7051001）
