Abstract
Fibre-reinforced plastics experience an increasing attention also in the non-aerospace sector. However, the detection of possible internal damage of safety-relevant components remains a challenge. In previous work, a meander-shaped sensor layout with a single fibre-optical sensor was proposed as a particularly efficient and reliable layout and its suitability was demonstrated in coupon tests. In the present work, the approach was transferred to a leaf spring made of glass fibre reinforced plastics and investigated in an extensive test campaign with a realistic test setup. The investigations show the particular suitability of the proposed meander-shaped sensor layout for simultaneous loads monitoring and structural health monitoring.
Highlights
A meander-shaped sensor layout with a single fibre-optical sensor was proposed as a efficient and reliable layout and its suitability was demonstrated in coupon tests
Structures made of Fibre-Reinforced Plastics (FRP) are attracting more and more attention in the non-aviation sector due to their good strength-to-weight and stiffness-to-weight ratios
This paper demonstrates the use of a meander-shaped sensor layout to monitor a GlassFibre-Reinforced Plastics (GFRP) leaf spring in combination with strain in zero-strain direction as a structural damage indicator
Summary
Structures made of Fibre-Reinforced Plastics (FRP) are attracting more and more attention in the non-aviation sector due to their good strength-to-weight and stiffness-to-weight ratios. A level 4 system, on the other hand, carries out a complete evaluation of the damage in terms of size, severity and determines the resulting residual strength and residual service life of the structure. This requires more meaningful measurements in combination with reliable data-based or physics-based models. When considering structures made of FRP, Fibre-Optical Sensors (FOS) are promising due to their fibrous nature They can already be integrated in the manufacturing process and enable measurement in the inner part of the material. Several load levels are taken into account alongside test specimens with artificial delamination
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