Fiber bragg grating sensing-based torsional performance monitoring system for carbon fiber reinforced plastic drive shafts

This paper designs a Carbon Fiber Reinforced Plastic Carbon Fiber Reinforced Plastic (CFRP) drive shaft with pre-buried Fiber Bragg Grating (FBG) sensors. The CFRP driveshaft shaft tube is made of full carbon fiber composite material, taking into account of the FBG sensor endface lead-out method and the influence of torsion and fatigue tester fixture size. Taking into account the FBG sensor end lead and the influence of torsional fatigue testing machine fixture size, the metal head of the drive shaft is optimized. At the same time, combined with the characteristics of the composite molding process, the lay-up design and torsional performance research were carried out. In order to obtain the interlayer strain information of the CFRP drive shaft in service due to the torsional load, 15 FBG sensors were pre-embedded in the fabrication process according to the design structure and layup scheme, and the layout of the FBG sensors was determined. The pre-embedded method of FBG sensors and the protection method of fiber optic lead-out are studied, and the pre-embedded 15 FBG sensors have good signals and a survival rate of 100%.