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Development and Qualification of FBG-Based Strain Patches and Rosettes

N. KUSCHE, V. G. SCHUKAR, C. SCHILDER, E. KÖPPE, W. R. HABEL

Abstract


A fibre Bragg grating (FBG) strain patch specially adapted for long-term and high-strain applications was developed and characterised. Additionally, in the case of unknown main stress axis, two fibre optic strain rosettes were developed. The design concept for the patch and the rosettes is based on a glass fibre reinforced plastic (gfrp) carrier material. The patches were characterised due to their strain gauge factor and fatigue behaviour. As a result, FBG strain patches with linear strain behaviour and excellent fatigue resistance were developed and can be used as part of a monitoring system for aerospace structures or wind turbine power plants. The rosettes were designed to be small in geometrical size and their strain transfer behaviour was characterised.

Keywords


fibre Bragg grating, patch, rosette, strain gauge factor, fatigue behaviour, validationText

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