Abstract
We propose here the monitoring of the Liquid Resin Infusion (LRI) process for using a superimposed long period (LPG) and short period (FBG) Bragg grating sensor. Monitoring of such a process is usually made measuring simultaneously temperature and strain by the use of an electro-optical device (FBG-Thermocouple). It has been shown that an applied solicitation is measured by a wavelength shift with a different sensitivity for LPG and FBG; thus strain and temperature influences can be determined separately by measuring corresponding wavelength shifts. The reported configuration is based on the use of these two Bragg gratings types written in the same fibre section, which allows us to discriminate the contributions of the temperature and strain. The sensor is embedded in a composite specimen manufactured by LRI process for monitoring in real time and simultaneously the applied temperature and strain.
Highlights
Polymer matrix composites are more and more used as structural materials for many applications because of their weight and high strength
We propose here the monitoring of the Liquid Resin Infusion (LRI) process for using a superimposed long period (LPG) and short period (FBG) Bragg grating sensor
Among the composite manufacturing processes, the Liquid Resin Infusion (LRI) process is a novel process for polymer matrix composites whose major interests are to lead to quality controlled parts and reduced assembly steps by infusing components and sub-components at the same time
Summary
Polymer matrix composites are more and more used as structural materials for many applications because of their weight and high strength. Optical fibre sensors are generally considered as alternative solutions to measure and localize the amplitudes of applied solicitations, in applications where the information can not be assessed directly Because of their low intrusivity, optical fibres can be embedded into the polymer matrix to perform in-situ and real-time measurements. We set out an experimental method for measuring strain and temperature applied in the composite part during its fabrication by Liquid Resin Infusion (LRI) process [8] It consists of insitu sensor instrumentation for extracting thermal and mechanical characteristics of the composite material during both the infusion and the curing, based on a dual period fibre Bragg grating [12]. The results obtained with the embedded-sensor during the curing of a pure epoxy resin and the first data concerning the LRI process monitoring are presented
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