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报道了一种分析包覆光纤布拉格光栅(FBG)传感器应力传递规律的方法。利用剪滞法理论将光纤布拉格光栅和其包覆材料看成一种复合体,从力学角度分析光纤布拉格光栅被包覆后的应力传递规律,得到当光纤布拉格光栅一定时,被包覆光纤布拉格光栅的应力传递系数仅与包覆材料的尺寸和杨氏模量有关。采用三种不同的包覆材料(聚合物、毛细钢管和毛细铜管)对光纤布拉格光栅进行了多个半径的封装,验证包覆光纤布拉格光栅的应力传递系数,实验证明,理论结果和实测数据基本吻合。
A method to analyze the stress transfer law of coated fiber Bragg grating (FBG) sensors is reported. Based on the theory of shear lag, the fiber Bragg gratings and their cladding materials are regarded as a kind of complex. From the mechanical point of view, the stress transfer laws of fiber Bragg gratings after being coated are obtained. When the fiber Bragg gratings are fixed, the fiber Bragg grating The stress transfer coefficient depends only on the size and Young’s modulus of the cladding material. Three different cladding materials (polymer, capillary tube and capillary copper tube) were used to package fiber Bragg gratings in multiple radii to verify the stress transfer coefficient of the fiber Bragg grating. The experimental results show that the theoretical results and the measured data Basically consistent.