Konstantaki Maria, Violakis Georgios, Pappas Georgios A, Geernaert Thomas, Korakas Nikos, Tiriakidis Nikos, Tiriakidi Thomai, Tiriakidis Kosmas, Thienpont Hugo, Berghmans Francis, Botsis John, Pissadakis Stavros
Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), Heraklion, 70013 Crete, Greece.
Ecole Polytechnique Fédérale de Lausanne (EPFL), LMAF, STI, CH-1015 Lausanne, Switzerland.
Sensors (Basel). 2021 Mar 31;21(7):2403. doi: 10.3390/s21072403.
In this study, silica glass, optical fiber Bragg gratings (FBGs) are used for torque-induced strain monitoring in carbon fiber reinforced polymer (CFRP) hollow shafts toward the development of a methodology for structural load monitoring. Optical fibers with gratings are embedded during shaft manufacturing, by an industrial filament winding process, along different orientations with respect to its central axis and surface mounted after production. Experimental results are supported by numerical modeling of the shaft with appropriate boundary conditions and homogenized material properties. For an applied torque up to 800 Nm, the strain sensitivity of an embedded grating positioned along the reinforcing fibers' direction winded under 55° is in the order of 3.6 pm/Nm, while this value is more than 4× times higher than the other examined orientations. The study also shows that surface-mounted optical fiber Bragg gratings along the reinforcing carbon fibers' direction perform equally well in monitoring strains in composite shafts under torque.
在本研究中，使用石英玻璃、光纤布拉格光栅（FBG）对碳纤维增强聚合物（CFRP）空心轴中的扭矩诱导应变进行监测，以开发一种结构载荷监测方法。带光栅的光纤在轴制造过程中，通过工业纤维缠绕工艺，相对于其中心轴沿不同方向嵌入，并在生产后进行表面安装。通过对具有适当边界条件和均匀材料特性的轴进行数值建模，验证了实验结果。对于高达800 Nm的施加扭矩，沿55°以下缠绕的增强纤维方向定位的嵌入式光栅的应变灵敏度约为3.6 pm/Nm，而该值比其他测试方向高出4倍以上。该研究还表明，沿增强碳纤维方向表面安装的光纤布拉格光栅在监测复合轴在扭矩作用下的应变方面表现同样出色。
