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An investigation of spectral response of embedded Fibre Bragg Grating (FBG) sensors in a hollow composite cylindrical beam under pure torsion and combined loading

机译：纯扭力和组合载荷作用下空心复合圆柱梁中嵌入式光纤光栅传感器的光谱响应研究

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This paper details an investigation of the response spectra of an FBG sensor embedded in a cylindrical hollow composite beam which is subjected to pure torsion and torsion - bending combined loading. The spectra of embedded FBG sensors under torsional and combined loading were obtained and post processed in order to investigate the performances of FBG sensors in torsional strain measurements. Further, the spectra of the embedded FBGs located at the vicinity of the points of damage inside the tube were also investigated to identify the spectral changes due to the damage. A detailed finite element mesh was created for the hollow beam specimen and static analysis was performed for comparison. It has been found that the FEA results are in good agreement with the experimental results. Further, it has been observed that the reflected spectrums of FBG sensors were chirped due to a possible warping of the FBG sensor due to torsional loading.
机译：本文详细研究了嵌在圆柱空心复合梁中的FBG传感器的响应谱，该复合梁承受纯扭力和扭弯组合荷载。为了研究FBG传感器在扭转应变测量中的性能，获得了嵌入式FBG传感器在扭转和组合载荷下的光谱并进行了后处理。此外，还研究了位于管内损坏点附近的嵌入式FBG的光谱，以识别由于损坏引起的光谱变化。为空心梁样本创建了详细的有限元网格，并进行了静态分析以进行比较。已经发现，有限元分析结果与实验结果吻合良好。此外，已经观察到，FBG传感器的反射光谱由于扭转载荷可能导致FBG传感器翘曲而ed。

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