A Sensing Mechanism and the Application of a Surface-Bonded FBG Dynamometry Bolt
A Sensing Mechanism and the Application of a Surface-Bonded FBG Dynamometry Bolt
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DOI：
10.3390/app12073225
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发表时间：
2022-04-01
影响因子：
2.7
通讯作者：
Wu, Gang
中科院分区：
文献类型：
--
作者：
Liang, Minfu;Fang, Xinqiu;Wu, Gang
本文设计了一种新型表面粘结型光纤布拉格光栅测力螺栓。假定粘结层为线性粘弹性材料，其蠕变力学行为用标准的线性固体模型表示。建立了表面粘结型FBG传感器的剪切应变传递模型。此外，还得到了表面粘结FBG传感器的瞬时应变传递函数和准静态应变传递函数。通过单轴拉伸试验和长期恒载拉伸试验验证了功能的有效性。测试结果表明，FBG传感器测得的应变与电阻应变片测得的应变成比例关系。此外，在长时间的固定载荷作用下，FBG传感器的应变有漂移的趋势，应变降低率约为40.5%。最后，在某矿区进行了现场应用。实践证明，基于FBG传感技术的矿压在线监测系统能够成功监测锚杆的应力状态。
In the present paper, a new type of surface-bonded fiber Bragg grating (FBG) dynamometry bolt is designed. It is assumed that the adhesive layer is a linear viscoelastic material and its creep mechanical behavior is expressed by the standard linear solid model. The shear strain transfer model of the surface-bonded FBG sensor is established. Additionally, the instantaneous and quasistatic strain transfer functions of the surface-bonded FBG sensor are obtained. The functions are validated by a uniaxial tensile test and a long-term constant-load tensile test. The test results show that the strain measured by the FBG sensor has a proportional relationship with the strain measured by the resistance strain gauge. Furthermore, under the fixed load for a long period of time, the strain of the FBG sensor has a tendency to drift and the strain reduction rate is about 40.5%. Finally, the field application is carried out in a mining area. It has been proved that the ground pressure online monitoring system based on the FBG sensing technology can successfully monitor the stress of the rock bolt.