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    pulsed thermography.pptx (3.571Mo)
    Date
    2013-07
    Auteur
    GERLACH, Nathalie
    DEMY, Philippe
    Lecomte-Beckers, Jacqueline
    Montrieux, Henri-Michel
    Mertens, Anne
    Ibarra-Castaneto, Clemente
    Madague, Xhavier
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    Comparison Between Optical Pulsed Thermography and Vibrothermography for the Assessment of Carbon Fiber Composite Materials

    Résumé
    Pulsed thermography and vibrothermography are two active thermography techniques characterized by different heating methods of the specimen. In pulsed phase thermography, a sample is heated by two flash lamps for a short period to inject a Dirac impulse heat in the material. The cooling of the part is monitored with an infrared camera to detect thermal contrast in the image, characteristic of the presence of a defect. In vibrothermography, high frequency vibrations are injected into the sample causing an internal heating observed on surface right above the defect due to diverse phenomena as friction or viscoelastic hysteresis. If pulsed thermography is a well-known technique that has been integrated into the arsenal of industrial NDT methods, vibrothermography is a less common experimental method still subject to theoretical and practical investigations. This article aims to compare the effectiveness of the two methods in the case of different types of composites based on carbon fibers: carbon fiber reinforced plastic (CFRP) plates as well as a completely new material: carbon magnesium composite

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