Non-destructive Testing of Paint Coatings on Steel Plates by Ultrasonic Reflectometry
| Autor: | Didier Laux, Franck Augereau, X. Zhang, E. Le Clezio, N. A. Ismaili, M. Kuntz, Gilles Despaux |
|---|---|
| Přispěvatelé: | California Institute of Technology (CALTECH), Institut d’Electronique et des Systèmes (IES), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Matériaux, MicroCapteurs et Acoustique (M2A), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Plastes et différenciation cellulaire (PDC), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
010302 applied physics
Materials science business.industry Mechanical Engineering 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences [SPI.TRON]Engineering Sciences [physics]/Electronics Transducer Optics Coating Mechanics of Materials Nondestructive testing Goniometer 0103 physical sciences engineering Ultrasonic sensor Reflection coefficient Elasticity (economics) Composite material 0210 nano-technology business Reflectometry ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Nondestructive Evaluation Journal of Nondestructive Evaluation, Springer Verlag, 2014, 33 (4), pp.504-514. ⟨10.1007/s10921-014-0246-8⟩ |
| ISSN: | 0195-9298 1573-4862 |
| Popis: | An ultrasonic reflectometry method has been used successfully to detect elasticity changes following the curing of 100 $$\upmu $$ m thick epoxy films (DGEBA-PAA) coated onto 1.5 mm thick steel plates. The method employs a goniometric apparatus to measure the reflection coefficient amplitude around 5 MHz followed by a standard FFT analysis of the reflected signal. A specific ultrasonic wave mode was identified which was dependent on, and correlated with, the presence of the coating layer. The goniometer angle associated with this mode was different from that associated with Lamb modes of the plate, enabling the new mode to be detected reliably. The sensitivity of the new mode to variations in the paint mass density, longitudinal and transverse velocities and thickness has been quantified numerically by using Brekhovskikh’s model with due account taken of the finite width of the ultrasonic fields of the transducers. The method was tested for the detection of the evolution of the coating elasticity during curing at 80 $$^{\circ }$$ C for 400 h. Compensation was applied to correct for the effect of the natural swelling of the paint layer on the angular position of the tracked mode, and this was validated experimentally. The evolution of the angular position was found to offer a reliable means to detect elasticity changes during the cure of the coating. The mass density variation in the coating during cure only weakly affected the angular position. This method will provide a promising tool for the non destructive evaluation of paint coatings, particularly in service for the detection of ageing effects in the longer term. |
| Databáze: | OpenAIRE |
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