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Nondestructive Testing of a Complex Aluminium‑CFRP Hybrid Structure with EMAT and Thermography

: Schwarz, Michael; Schwarz, Mathias; Herter, Simon; Herrmann, Hans-Georg


Journal of Nondestructive Evaluation 38 (2019), Art. 35, 9 S.
ISSN: 0195-9298
ISSN: 1573-4862
Deutsche Forschungsgemeinschaft DFG
HE 7079/1-2; Feuchte in Polymeren
Charakterisierung und Modellierung des feuchteabhängigen thermomechanischen Verhaltens von Polyamiden
Fraunhofer IZFP ()
composite material; EMAT; interface; Metal-CFRP-hybrid; POD; thermography

A new concept of an aluminium-CFRP (carbon-fibre-reinforced-polymer) hybrid structure with integrated thermoplastic layer is introduced in this work. The occurring interfaces between the three materials are characterised with flash thermography and ultrasonic testing with electromagnetic acoustic transducer (EMAT). Thermography is able to detect artificial integrated defects in inner layers of the CFRP component and to characterise the bonding quality of the interface between the CFRPand the thermoplastic layer. Additionally a POD model (probability of detection) provides the smallest detectable size a90/95 of gapping defects in the CFRP with 5.184 mm diameter. This work shows that a characterisation of the deeper interface between the aluminium and the thermoplastic layer is possible despite the small and complex geometry. Furthermore thequality of this bonding can be investigated independently of the EMAT’s position. By combining thermography and EMAT the whole complex hybrid structure with its interfaces can be characterised.