21 March 1994 Thermographic NDT based on transient temperature field under Joule effect heating
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Thermographic NDT based on the transient temperature distribution under the Joule effect heating by an electric current was discussed. Two different types of inspection methods, the singular method and the insulation method, were examined. The singular method based on the heat concentration at the crack tip was successfully applied to the identification of the through- thickness and surface cracks embedded in steel plates. The resolution of the crack identification by the singular method was examined by the current intensity factor and the thermal diffusion length. The insulation method based on the temperature turbulence appears on the sample surface due to the thermal insulation of the defect was tested for the identification of the delaminated defect in CFRP. Two methods of the Joule effect heating, the direct current application and the induction heating, were successfully applied for the thermographic NDT of the delaminated defects in CFRP samples. The thermographic NDT developed in this study was found to be applicable to nondestructive flaw- and defect- inspection both in metallic and composite materials.
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Takahide Sakagami, Takahide Sakagami, Keiji Ogura, Keiji Ogura, } "Thermographic NDT based on transient temperature field under Joule effect heating", Proc. SPIE 2245, Thermosense XVI: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (21 March 1994); doi: 10.1117/12.171157; https://doi.org/10.1117/12.171157

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