Journal
SENSORS
Volume 21, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/s21155050
Keywords
strain rosette; fiber Bragg grating; strain; polymer composite material; numerical simulation
Funding
- Ministry of Education and Science of the Russian Federation [075-15-2020-925]
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This paper discusses the results of strain measuring experiments using fiber Bragg grating sensors embedded in polymer composite material, including the process of manufacturing the samples and the variant of strain calculations based on experimental data. The study also offers a numerical model for the experiment and the results of numerical simulation, providing an explanation for the absence of expected peaks in the reflected optical spectrum under certain loading conditions.
The results of strain measuring experiments, with the help of rosettes consisting of fiber Bragg grating sensors (FBG) embedded at the manufacturing stage in a polymer composite material are considered in this paper. The samples were made by the direct pressing method from fiberglass prepregs. A cross-shaped sample was tested under loading conditions corresponding to a complex stress state. A variant of strain calculations based on experimental data is discussed. The calculations were performed under the assumption of a uniaxial stress state in an optical fiber embedded in the material. The obtained results provide a reasonable explanation of the absence in the conducted experiment of two peaks in the reflected optical spectrum, the presence of which follows from the known theoretical principles. The experimental result with two peaks in the reflected optical spectrum was obtained for the same sample under a different loading scheme. The proposed variant of the numerical model of the experiment and the results of numerical simulation made for FBG rosettes embedded in the material allowed to estimate error in the strain values calculated on the assumption of the uniaxial stress state in the optical fiber and in the presence of two peaks in the reflected optical spectrum.
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