光纤布拉格光栅
材料科学
扭矩
光学
栅栏
磁铁
带宽(计算)
螺栓连接
声学
复合数
光纤
结构工程
光电子学
工程类
物理
复合材料
有限元法
机械工程
热力学
电信
作者
Mike Yeager,Anthony Whitaker,Michael D. Todd
标识
DOI:10.1177/1045389x17705217
摘要
This work presents a new method for monitoring the preload torque in a composite bolted connection using an embedded fiber Bragg grating sensor. A unique washer was designed to impose a specified nonuniform strain field across the grating, causing distortion in the reflected optical spectrum. Using the full-width at half maximum bandwidth of the Bragg reflection spectrum as the preload-sensitive feature, it is shown that this feature increases monotonically—and quite linearly—with increasing applied bolt torque. It is also demonstrated that, although distorted, the spectral structure of the sensor is maintained such that it is simultaneously able to function in its typical use as a uniaxial strain sensor, thus essentially creating a dual-purpose sensor. The computational design approach is validated with a prototype experiment.
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