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Effect of adhesive failure on measurement of concrete cracks using fiber Bragg grating sensors

机译：Effect of adhesive failure on measurement of concrete cracks using fiber Bragg grating sensors

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摘要

Systematic deviations in the sensing process of optical fiber sensors (OFSs), which are induced by interfacial failures (concrete/adhesive (C/A)), are unavoidable. Thus, it is important to evaluate the interfacial failure of heterogeneous OFSs to correct their systematic deviations. In this study, experimental investigations were conducted on the interfacial failure of adhesive-packed fiber Bragg grating sensors (FBGs) attached to a concrete matrix. Further, an inverse analytical method for crack-induced strain distribution at the C/A interface was proposed. Finally, the strain of the initial debonding was determined using an energy-based criterion, as well as the debonding length. The results indicate that the fracture propagation of notched concrete beams can be quantitatively analyzed by combining FBGs and the DIC technology. Theoretical values of the debonding length and fitted strain of the adhesive subjected to digital imaging conformed with the test results. The plastic failure of adhesive materials was related to the performance of C/A interfacial bonding.

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