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Insufficient or excessive preload has been regarded as the main issue that may endanger the safety of bolted joints operated at high temperatures. A new technique for monitoring the bolt clamping force is thus proposed using metal-packaged regenerated fiber Bragg grating (RFBG) strain sensors spot-welded onto the bolt. The measurement of the clamping force in a bolted steel-steel joint subjected to thermal loading is conducted. The experimental results show that the bolt clamping force can be monitored by the metal-packaged RFBG strain sensor at high temperatures up to 500 °C. This technique provides a new possibility for structural health monitoring of bolted joints operated at high temperatures.
Yong-Kuo Huang,Yun Tu, andShan-Tung Tu
"Monitoring of bolt clamping force at high temperatures using metal-packaged regenerated fiber Bragg grating strain sensors", Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 1046412 (25 October 2017); https://doi.org/10.1117/12.2285022
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Yong-Kuo Huang, Yun Tu, Shan-Tung Tu, "Monitoring of bolt clamping force at high temperatures using metal-packaged regenerated fiber Bragg grating strain sensors," Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 1046412 (25 October 2017); https://doi.org/10.1117/12.2285022