Abstract
Paulownia-wood composite sandwich beams were fabricated, in which FBG sensors were embedded in the grooves arranged on the top and bottom of paulownia wood core material. Four-point bending test, low-speed impact test and residual bending capacity test were carried out on the sandwich beams. In the bending test, comparative analysis of the built-in FBG sensor and externally attached resistance strain gauges showed that, with the characteristics of high sensitivity and accuracy, FBG sensor could reflect the total deformation behavior of the sandwich beams. In the low-velocity impact tests, FBG can effectively monitor the internal strain of the sandwich beam. However, due to the low acquisition frequency of instrument equipment, the details of the impact could not be reflected clearly. After impact, some available FBG sensors left in the beams could be used to evaluate the residual bearing capacity of the sandwich beam.
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