- Application Notes
Low Frequency PAUT Inspection of GFRP
Certain heterogeneous materials can be highly attenuative to ultrasound. As a result, lower frequency probes are required, especially for thick sections which otherwise can be difficult to inspect.
In this application note we will be focussing on the inspection of glass fibre reinforced plastics (GFRP), specifically those used in the manufacturing of wind turbine blades. Common defects in this material will include air voids/bubbles trapped in the epoxy (porosity), delaminations between fibre layers especially around areas with thickness changes and damage to the spar due to excess stress on the blades.
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