[article]
| Titre : |
Linear and nonlinear ultrasonics for material damage evaluation and health monitoring |
| Type de document : |
texte imprimé |
| Auteurs : |
Rachid El Guerjouma, Auteur ; L. Goujon, Auteur ; H. Nachad, Auteur ; A. Faiz, Auteur ; Nathalie Godin, Auteur ; Mourad Bentahar, Auteur ; Jean-Claude Baboux, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 48-50 |
| Note générale : |
Bibliogr. |
| Langues : |
Français (fre) |
| Catégories : |
Composites
Contrôle non destructif
Détection de défauts (Ingénierie)
Ultrasons
|
| Index. décimale : |
620.11 Matériaux (propriétés, résistance) |
| Résumé : |
In mechanics of material and material sciences, the early detection of damage, its non destructive characterisation and monitoring is of great importance. In this field ultrasonic waves can be very helpful especially when nonlinear ultrasonics is considered. In this work, linear and non linear ultrasonics are used for damage characterisation. Concerning linear ultrasonics, we show that velocity and linear elastic constants are good damage indicators for composites materials. For these materials, ultrasonic velocity is measured in situ during a tensile test, at the same time acoustic activity due to damage initiation and development. For other materials as metallic ones, linear ultrasonics is not sensitive enough for damage characterisation. In this case we show that nonlinear ultrasonics through the nonlinearity parameter β, is very sensitive to evaluate damage and to detect it very early. In this work we show that if linear ultrasonics through velocity measurements is a very good damage indicator especially for composite materials, nonlinear ultrasonics can be a very efficient tool for the early detection of damage and also for health monitoring. So it can greatly contribute to the understanding of damage initiation. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10276 |
in MATERIAUX & TECHNIQUES > N° Hors série (2002) . - p. 48-50
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