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        Reliability and Accuracy of Embedded Fiber Bragg Grating Sensors for Strain Monitoring in Advanced Composite Structures

        Raffaella Di Sante,Lorenzo Donati,Enrico Troiani,Paolo Proli 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.3

        This work investigated issues for an efficient and reliable embedding and use of Fiber Bragg Grating (FBG)sensors for strain monitoring of composite structures with particular regard to the manufacturing processof components in the nautical field by means of the vacuum bag technique in autoclave. CFRP materiallaminates with embedded FBGs were produced and the effect of the curing process parameters on the lighttransmission characteristics of the optical fibers was initially investigated. Two different types of coating,namely polyimide and acrylate, were tested by measuring the light attenuation by an Optical Time DomainReflectometer. Tensile specimens were subsequently extracted from the laminas and instrumented also with asurface-mounted conventional electrical strain gage (SG). Comparison between the FBG and SG measurementsduring static tensile tests allowed the evaluation of the strain monitoring capability of the FBGs, inparticular of their sensitivity (i.e., gage factor) when embedded.

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