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Robust Polymer Planar Bragg Grating Sensors Embedded in Commercial-Grade Composites

  • This contribution demonstrates the functionality of polymer planar Bragg grating (PPBG) sensors integrated into commercial-grade carbon fiber reinforced polymer (CFRP) components. Multiple CFRP specimens are generated by curing a stack of pre-impregnated fibers inside of a heated mechanical press, exposing the polymer sensor to a pressure of 7 bar and a temperature of 120 °C for 2 h. After integration, the sensor still exhibits a strong and evaluable signal. Subsequent flexural experiments reveal a linear response of the integrated sensor’s Bragg wavelength to the CFRP specimen’s maximum deflection. Additional findings demonstrate that the embedded PPBG can be used to detect plastic deformations of a CFRP workpiece, whereas a linear correlation of plastic deformation to the resulting Bragg signal offset is determined. A plausibility check of the obtained results is delivered by a comparison of three-point flexural experiments on bulk CFRP workpieces, without integrated sensors and additional specimens featuring external optical sensors affixed to their surface. It is found that PPBGs based on cyclic olefin copolymers are able to overcome the temperature-related limitations of traditional polymer-based optical sensors and can thus be directly integrated into commercial-grade composites during production.

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Author:Stefan KeferORCiD, Theresia Sauer, Steffen HesslerORCiD, Michael Kaloudis, Bernhard SchmaußORCiD, Ralf HellmannORCiD
URL:https://www.mdpi.com/2073-4360/12/3/715/htm
DOI:https://doi.org/10.3390/polym12030715
Parent Title (English):Polymers
Document Type:Article
Language:English
Year of Completion:2020
Date of first Publication:2020/03/24
Release Date:2020/03/26
Tag:Bragg grating sensors; carbon fiber reinforced polymers; cyclic olefin copolymers
GND Keyword:Bragg-Reflektor; Optischer Sensor
Volume:12
Issue:3
First Page:715
Last Page:715
Urheberrecht:1
research focus :Intelligent Systems / Intelligent Sensors and Signals
Materials / Clean Tech
Materials / Innovative Material Processing
Materials / Material Testing & Sensor Technology
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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