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Proceedings Paper

NDE of porosity in CFRP by multiple thermographic techniques
Author(s): Ermanno G. Grinzato; Sergio Marinetti; Paolo Giulio Bison
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Paper 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.

Paper Details

Date Published: 15 March 2002
PDF: 11 pages
Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); doi: 10.1117/12.459612
Show Author Affiliations
Ermanno G. Grinzato, CNR-ITEF (Italy)
Sergio Marinetti, CNR-ITEF (Italy)
Paolo Giulio Bison, CNR-ITEF (Italy)

Published in SPIE Proceedings Vol. 4710:
Thermosense XXIV
Xavier P. Maldague; Andres E. Rozlosnik, Editor(s)

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