[en] Locating defects in CFRP composite materials is a hot topic in nondestructive inspection (NDI). Beside classical NDI technique, such as ultrasound testing (UT), contactless techniques are actively studied. Generally manufacturers of CFRP structure incorporate artificial defects in the bulk, with different extents and depths, in order to study the performance of a specific NDI technique to detect the defect. One of the most common defects in CFRP is delamination between two layers. This is simulated by inserting teflon sheets which, like air, acts as ultrasound blocker in UT. When such reference part is used to assess NDI performance of thermography or shearography, we only observe respectively the thermal or mechanical response of teflon with respect to external loading used with these techniques. In this work, we assess other possibilities for artificial defects in CFRP matrix. For that a CFRP structure was developed and which incorporates teflon, flat-bottom holes and delamination obtained by the pull-out method. We experimentally studied the signals and we discuss the difference between the various artificial defects methods.
Research Center/Unit :
CSL - Centre Spatial de Liège - ULiège
Disciplines :
Physics
Author, co-author :
Blain, Pascal ; Université de Liège > CSL (Centre Spatial de Liège)
Blitz, J., Simpson, G., [Ultrasonic Methods for Non-Destructive Testing], Chapman & Hall (1992
Maldague, X., [Theory and Practice of Infrared Technology for Nondestructive Testing], Wiley-Interscience (2001
Jorge, I., Venegas, P., Vega, L., Lopez, I., Vollheim, B., Krausz, L., Georges, M., "Review of thermal imaging systems in composite defect detection, " Infrared Physics & Technology 61, 167-175 (2013
Kreis, T., [Handbook of Holographic Interferometry: Optical and Digital Methods], Wiley-VCH Verlag GmbH | Co. KGaA, Weinheim (2005
Steinchen, W., Yang, L., [Digital Shearography: Theory and application of digital speckle pattern shearing interferometry], SPIE press (2003
Kalms, M., Osten, W., "Mobile shearography system for the inspection of aircraft and automotive components, " Opt. Eng. 42 (5), 1188-1196 (2003
Georges, M. P., Vandenrijt, J.-F., Thizy, C., Alexeenko, I., Pedrini, G., Rochet, J., Vollheim, B., Lopez, I., Jorge, I., Rochet, J., Osten, W., "Combined holography and thermography in a single sensor through imageplane holography at thermal infrared wavelengths, " Opt. Exp. 22, 25517-25529 (2014
Georges, M.P., "Comparison between thermographic and holographic techniques for nondestructive testing of composites: Similarities, differences and potential cross-fertilization, " Proc. SPIE 9660, 966002 (2015
Georges, M.P., "Speckle interferometry in the long-wave infrared for combining holography and thermography in a single sensor. Applications to nondestructive testing: The FANTOM Project, " Proc. SPIE 9525, 952557 (2015
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.