Low frequency air scan for carbon/carbon composite 3D pieces non destructive testing

Anifrani, J. C.; Strycek, J. O.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1215
Academic Journal
The French Aerospace company AEROSPATIALE is involved in the Venture Star Program of Lockheed Martin which is in charge of the development of the future re-usable shuttle name X33. X33 will be used for supplying the Columbus Orbital Facilities (COF), the International Orbital Station. AEROSPATIALE has to manufacture the nose and the skins which are thermostructural parts of the vehicle. They are composite Carbon/Carbon 3-D pieces. The architecture of the composite material is 2.5-D with stitched points crossing the thickness and connecting different layers. The suitable Non Destructive Testing (NDT) technique to detect delaminations on this material is Ultrasonic wave. But, the stitched point behave like wave guides and make the control inappropriate. To go beyond this difficulty, we have developed specific air scan low frequency -50 KHz—sensors connect to our air-scan test set-up. This paper presents the work done for the development and the adaptation of our set-up and the main positive results obtained. The c-scan made on plane samples were successfully compared to infrared thermography and x-ray tomography cartography made on the same samples. The method has then been tested successfully on real C/C composites pieces made for the Venture Star Program. © 2000 American Institute of Physics.


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