In-process deformation measurements of translucent high speed fibre-reinforced disc rotors

Katrin Philipp; Angelos Filippatos; Nektarios Koukourakis; Robert Kuschmierz; Christoph Leithold; Albert Langkamp; Andreas Fischer; Jürgen Czarske

doi:10.1117/12.2185090

17 July 2015 In-process deformation measurements of translucent high speed fibre-reinforced disc rotors

Katrin Philipp, Angelos Filippatos, Nektarios Koukourakis, Robert Kuschmierz, Christoph Leithold, Albert Langkamp, Andreas Fischer, Jürgen Czarske

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Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 952407 (2015) https://doi.org/10.1117/12.2185090
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore

Abstract

The high stiffness to weight ratio of glass fibre-reinforced polymers (GFRP) makes them an attractive material for rotors e.g. in the aerospace industry. We report on recent developments towards non-contact, in-situ deformation measurements with temporal resolution up to 200 µs and micron measurement uncertainty. We determine the starting point of damage evolution inside the rotor material through radial expansion measurements. This leads to a better understanding of dynamic material behaviour regarding damage evolution and the prediction of damage initiation and propagation. The measurements are conducted using a novel multi-sensor system consisting of four laser Doppler distance (LDD) sensors. The LDD sensor, a two-wavelength Mach-Zehnder interferometer was already successfully applied for dynamic deformation measurements at metallic rotors. While translucency of the GFRP rotor material limits the applicability of most optical measurement techniques due to speckles from both surface and volume of the rotor, the LDD profits from speckles and is not disturbed by backscattered laser light from the rotor volume. The LDD sensor evaluates only signals from the rotor surface. The anisotropic glass fibre-reinforcement results in a rotationally asymmetric dynamic deformation. A novel signal processing algorithm is applied for the combination of the single sensor signals to obtain the shape of the investigated rotors. In conclusion, the applied multi-sensor system allows high temporal resolution dynamic deformation measurements. First investigations regarding damage evolution inside GFRP are presented as an important step towards a fundamental understanding of the material behaviour and the prediction of damage initiation and propagation.

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Katrin Philipp, Angelos Filippatos, Nektarios Koukourakis, Robert Kuschmierz, Christoph Leithold, Albert Langkamp, Andreas Fischer, and Jürgen Czarske "In-process deformation measurements of translucent high speed fibre-reinforced disc rotors", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 952407 (17 July 2015); https://doi.org/10.1117/12.2185090

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KEYWORDS

Sensors

Translucency

Doppler effect

Signal processing

Calibration

Glasses

Motion measurement

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