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Active thermography investigates composite defects.
Active infrared thermography is able to identify many defects in composite parts such as delamination, inclusions and incorrect fibre orientation. At the request of industrial manufacturers, Cetim conducted a study on the subject which is covered by a Performance report (ref: 9Q295). This technology applies heat (excitation) to the area to be inspected and analyses its propagation with a thermal camera in order to highlight the defects. However, depending on the parts to be inspected, the appropriate excitation method to be used, the position of the heat source and the duration of the heating must be determined.
Cetim’s study focused on the induction thermography of thermoplastic composites reinforcedwith unidirectional or woven carbon fibres. The excitation is obtained with an electric coil which generates eddy currents in the part. Two types of coils (flat and ferrite core) are assessed and compared to excitation with flash lamps. The results of this study reveal inter alia that the process which uses coils detect the corrugation of subsurface fibres and views the orientation of the first two composite plies.
The Performance report “Induction thermography on composites” (9Q295) can be consulted on our website in the “Mécathèque” section.
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