Non-destructive evaluation of seven wire strands using ultrasonic guided waves

نویسنده

  • Laurent LAGUERRE
چکیده

Seven-wire strands are commonly used in civil-engineering structures such a cable-stayed bridges, pre-stressed concrete bridges or retaining walls structures. These civil engineering structures suffer from ageing and degradation due to corrosion and fatigue of structural steel members. Guided ultrasonic waves are potentially attractive tools for non destructive assessment of their integrity. They generally combine the ability to inspect, in a single measurement, the whole width of the structure over an appreciable length along the guiding direction. Moreover, they provide a mean to access hidden parts of the structure, such as sections of strand partially or totally grouted in grease or cement. Guided wave nondestructive methodologies of inspection using magnetostrictive or piezoelectric devices are generally proposed, depending on the desired applications. The aim of this paper is to give an overview of the evolution of the theoretical and experimental works performed at LCPC on the non destructive evaluation of these members using ultrasonic guided waves generated and detected with piezoelectric mounted on the end section or with encircling magnetostrictive transducers. Results obtained for different frequency ranges on various configurations will be shown and discussed in order to quantify the performances and limits of guided ultrasonic wave inspection methodologies for real life structure applications. Résumé Les torons sept-fil sont très utilises dans les structures de génie civil comme les ponts haubans, les ponts en béton précontraints ou les murs de soutènement. Ces structures sont soumises au vieillissement et subissent des dégradations dues à la corrosion et la fatigue mécanique des parties structurales en acier. Les ondes ultrasonores guidées sont un outil présentant un intérêt certain pour une évaluation non-destructive de leur intégrité. Elles donnent la possibilité d’inspecter théoriquement la structure sur toute son épaisseur le long de sa plus grande dimension à partir d’une mesure unique. De plus, elles peuvent permettre d’accéder à des informations sur des parties cachées, partiellement ou totalement noyées dans de la graisse ou du ciment. Des méthodologies d’inspection non-destructives proposées utilisent généralement des dispositifs magnétostrictifs ou piézoélectriques en fonction de l’application désirée. L’objectif de cette présentation est de donner un aperçu de l’évolution des travaux théoriques et expérimentaux conduits aux LCPC sur l’évaluation non-destructive des ces parties et utilisant des ondes guidées générées et détectées avec l’aide de traducteurs piézoélectrique (placés sur la section droite de la terminaison du guide) ou magnétostrictifs (encerclant). Les résultats obtenus pour différentes gammes de fréquences pour diverses configurations seront montrés et discutés pour qualifier les performances et limites des méthodologies d’inspection par ondes guidées ultrasonores pour les applications réelles.

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تاریخ انتشار 2009