NDE of porosity in CFRP by multiple thermographic techniques

Ermanno G. Grinzato; Sergio Marinetti; Paolo Giulio Bison

doi:10.1117/12.459612

15 March 2002 NDE of porosity in CFRP by multiple thermographic techniques

Ermanno G. Grinzato, Sergio Marinetti, Paolo Giulio Bison

Proceedings Volume 4710, Thermosense XXIV; (2002) https://doi.org/10.1117/12.459612
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

Non Destructive Testing on aerospace components is continuously changing due to the developments in materials and manufacturing processes. Thermography, if compared with other methods is gaining a role that mainly depends on findings reliability. Furthermore, dedicated procedures to particular component-defects couples are devised using advanced tools. This paper is devoted to the identification of porosity anomalous level on composite structures by thermography. Porosity is normally investigated by ultrasound techniques that, on the other hand, under usual conditions, are not always able to distinguish voids from resin starved zones (which they are themselves defects under some circumstances). The continuous behavior of this kind of defect makes ordinary controls very difficult. The thermal properties mapping evaluation of local diffusivity and effusivity is used for this purpose. Both measures are sensible to the principal thermal properties variation, but the combination allows increasing considerably reliability of the result. Experimental results obtained on a real aeronautic part in different experimental conditions are reported and compared with findings given by Ultrasounds. Numerical modeling of the various conditions helps to select suitable heating devices. A principal goal is the fast testing of a whole component in a one shot. A significative time saving is added to an easier interpretation of data.

Citation Download Citation

Ermanno G. Grinzato, Sergio Marinetti, and Paolo Giulio Bison "NDE of porosity in CFRP by multiple thermographic techniques", Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); https://doi.org/10.1117/12.459612

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