| Titre : |
Listening to defects with bat ears : Detecting defects in fiber composite structure |
| Type de document : |
texte imprimé |
| Auteurs : |
Kai-Uwe Kohn, Auteur ; Yannick Bernhardt, Auteur ; Julian Ehrler, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 34-36 |
| Langues : |
Anglais (eng) |
| Catégories : |
Composites -- Analyse
Composites à fibres
Contrôle non destructif
Détection de défauts (Ingénierie)
Mesure -- Instruments
Résonance des défauts locaux
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
A newly developed method will make it possible to detect defects in fiber-reinforced plastic structures over large areas without contact and in a matter of seconds. The method uses what is known as local defect resonance: Defects such as impact damages have a specific resonant frequency that oscillate with a higher amplitude compared to the surrounding area. This local oscillation can be located within seconds using an advanced microphone system. |
| Note de contenu : |
- 72 microphones and a camera : How the method works
- A typical test setup
- Conclusion : Fast and cheap aleternative for touch-sensitive parts
- Fig. 1 : The left picture shows the measurement setup for vibration characterization of a flat-bottom hole plate by using a laser Doppler vibrometer. The right side shows the test result (RMS): The thinner the residual wall thickness, the higher the measured vibration speed
- Fig. 2 : Typical test setup with the new measuring method for testing the local defect resonance with an acoustic camera and vacuum shaker
- Fig. 3 : Test result: In the center, the impact damage is clearly visible. The signal on the right side is from the vacuum shaker
- Fig. 4 : Test result of the PMMA plate with flat bottom holes by using a vacuum shaker and acoustic camera |
| En ligne : |
https://drive.google.com/file/d/1kPfveHtFH5RsRnetCV9lEhHILHDMWIte/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40149 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 113, N° 4 (2023) . - p. 34-36
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