Ingenieurwissenschaften und zugeordnete Tätigkeiten
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- 2019 (3) (entfernen)
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- Vortrag (2)
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- GFK (2)
- 1D-Simulation (1)
- Aktive Thermographie (1)
- GFRP (1)
- Klebeverbindungen (1)
- Nicht-lineare Regression (1)
- Pulsed thermography (1)
- Rotorblatt (1)
- Thermografie (1)
- Wiederkehrende Prüfung (1)
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Eingeladener Vortrag
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The applicability of 1D-quadrupole-model on the depth estimation of overload-induced delaminations is tested in this contribution. While classical 1D-methods like Pulsed Phase Transformation and Thermographic Signal Reconstruction determine the depth of a defect by one parameter, a two-layer quadrupole model provides two parameters: depth and thermal resistance. In addition, the convectional losses at the surfaces may be considered. The defect investigated is a large-scale delamination in glass fibre reinforced polymer generated by tension overload.
Active thermography is a well suited non-destructive testing method for the challenging inspection of wind rotor blades. Since the GFRP structures are up to some centimetres thick, long pulse heating is required to provide an appropriate energy input into the structure. So far, no best practice exists to guarantee a reliable detection of deep-lying flaws. In this work, a step wedge specimen having a maximum thickness of 34mm is systematically investigated by experiment and well-matched simulations to assess the influence of the experimental parameters, like the absorbed energy, on thermal contrasts. Finally, a scheme to conduct full-scale test of a wind rotor blade in less than three hours is proposed.