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Distributed Fiber Optics Sensing Applied to Laminated Composites: Embedding Process, Strain Field Monitoring with OBR and Fracture Mechanisms

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Abstract

Optical fibers (OFs) are among the most promising technologies for distributed sensing in structure health monitoring of composites. Optical backscatter reflectometer (OBR) based on Rayleigh scattering enable to use the entire length of telcom OF as sensor, giving detailed information about the stain fields in the host structure. Embedded sensors can provide many advantages over surface bonded ones in terms of reliability and accuracy of the measurements. Here, OFs were embedded in between (0/0), (0/90) and (90/90) interfaces of a [02/902/02] glass fiber reinforced polymer (GFRP) and were further interrogated with OBR during tensile tests. Sensors were evaluated in terms of its sensing capabilities and fracture mechanism. OFs aligned in between (0/0) direction endured 5500 µε and deviated only 2.7% in the Young’s modulus calculation compared to mounted strain gauges. The other directions presented problems related to matrix rich area (0/90) and air bubbles imprisoning (90/90), reducing the sensing range. After reaching the cracking state, OFs fail progressively and are still capable of acting as sensor, as was showed in a simple visible laser scattering test. For the first time, embedding, interrogation with OBR and fracture mechanisms are approached in a single study, which provide valuable information for wide application of OFs in SHM.

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Acknowledgements

The authors gratefully acknowledge FAPESP-São Paulo Research Foundation for financial support (Processes 2014/00099-0 and 2015/25554-4) and Prof. Dr. Andreas Echtermeyer, NTNU-Norway, for full support during BEPE internship.

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  1. Department of Materials Engineering, Engineering School of São Carlos - University of São Paulo (SMM-EESC-USP), São Carlos, SP, 13566-590, Brazil

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Souza, G., Tarpani, J.R. Distributed Fiber Optics Sensing Applied to Laminated Composites: Embedding Process, Strain Field Monitoring with OBR and Fracture Mechanisms. J Nondestruct Eval 39, 77 (2020). https://doi.org/10.1007/s10921-020-00720-2

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