Abstract
The goal of our research was to develop a continuous glass fibre-reinforced epoxy matrix self-sensing composite. A fibre bundle arbitrarily chosen from the reinforcing glass fabric in the composite was prepared to guide white light. The power of the light transmitted by the fibres changes as a result of tensile loading. In our research, we show that a selected fibre bundle even without any special preparation can be used as a sensor to detect deformation even before the composite structure is damaged (before fibre breaking).
Highlights
The production of composites is increasing every year, and the technological development of fibre-reinforced polymer composites is especially fast
Since the sensor is built into the part, it can continuously provide a signal during operation, and continuous structural health monitoring can be performed by processing the signals
We showed that the light transmission abilities of the fibre bundle changed when mechanical load was applied on the composite material
Summary
The production of composites is increasing every year, and the technological development of fibre-reinforced polymer composites is especially fast. Composite products often operate in extreme conditions. Their usability is mostly determined by accidental damage, aging and corrosion. There are ready-made solutions for structural health monitoring with built-in optical sensors (e.g., Fiber Bragg Grating sensors [7,8,9,10,11,12,13]) with precise measurement of temperature and deformation. The diameter of the optical sensor is quite small (typically 125 microns), it is still an order of magnitude larger than the diameter of the individual reinforcing fibres, which creates an inhomogeneity in the composite, and a resin-rich area is formed next to the sensor, which can be a starting point of failure [14]. Because the refractive indexes of resins vary in a wide range [15], a glass
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