Sandwich composite structures with glass fibres can be successfully inspected using ultrasonic techniques. Where possible, the testing should be conducted in an immersion tank, which gives the best coupling conditions. If this is not possible, a standard flaw detector can also be deployed.
Phased array units have many significant advantages over conventional ultrasonic testing units. However, in the case of composite structures, the voltage that is applied to the transducers dictates the strength of the mechanical wave that is delivered to the composite. In the case of standard ultrasonic testing units, the voltage is five times higher than a phased array system. The stronger the ultrasonic mechanical wave, the better it can propagate inside the acoustically challenging material and the interpretation of the achieved results is more reliable.
This case study presents work done in the project, ‘Engineering, production and life‐cycle management for the complete construction of large‐length FIBRE‐based SHIPs (FIBRESHIP)’ that has received funding from the European Union's Horizon 2020 under grant agreement No 723360.