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Next generation acoustography ultrasonic NDI for advanced composite materials and structure / J. S. Sandhu in SAMPE JOURNAL, Vol. 46, N° 1 (01-02/2010)

[article]  inSAMPE JOURNAL > Vol. 46, N° 1 (01-02/2010) . - p. 6-12 Titre : Next generation acoustography ultrasonic NDI for advanced composite materials and structure Type de document : texte imprimé Auteurs : J. S. Sandhu, Auteur Année de publication : 2010 Article en page(s) : p. 6-12 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acousto-optique Composites Contrôle non destructif Imagerie ultrasonore Ultrasons Index. décimale : 668.4 Plastiques, vinyles Résumé : Acoustography differs from conventional ultrasonic testing in that test objects are inspected in full field, analogously to real time x-ray imaging. The approach uses a novel, super high resolution large area acousto-optic (AO) sensor, which allows image formation through simple ultrasound shadow casting, analogous to x-ray image formation. Recent improvements in AO sensor technology have greatly expanded acoustography's nondestructive inspection (NDI) abilities. These recent developments offerssignificant advantages over conventional point-by-point ultrasonic scanning methods, such as wide area inspection, high resolution, circumvention of bulky mechanical scanning apparatuses, very user friendly allowing use and interpretation of data by low skill level operators and simple set-up, thus making acoustography very efficient and a powerful inspection tool during manufacturing. In addition, acoustography is also being developed so that it can be adapted for field inspection use. Composite materials are widely used in aerospace structures for their exceptionally high specific strength to weight ratios. Acoustography wes used to inspect a variety of impact damaged carbon/epoxy composite coupon samples, typically used in aerospace structures. In addition, US Army helicopter main rotor blade sections with induced field damage were also inspected. These structures include a variety of materials,such as a primary metal inner load carrying beam structure (spar), a Nomex honeycomb core region sandwiched between thin glass/epoxy skins and all components adhesively bonded. Induced damage to the blade sections simulated typical field threats, such as, low velocity ballistic impacts from projectiles, fragments or debris, as well as, simulated maintenance tool drops causing localized crush core damage to the honeycomb region. Acoustography inspection results will be presented side-by-side with conventional ultrasonic inspection results. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8148 [article]

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Non-destructive inspection technologies for VARTM composite structures / Y. Aoki in SAMPE JOURNAL, Vol. 46, N° 1 (01-02/2010)

[article]  inSAMPE JOURNAL > Vol. 46, N° 1 (01-02/2010) . - p. 22-27 Titre : Non-destructive inspection technologies for VARTM composite structures Type de document : texte imprimé Auteurs : Y. Aoki, Auteur ; Y. Nagao, Auteur ; M. Sugimoto, Auteur Année de publication : 2010 Article en page(s) : p. 22-27 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Contrôle non destructif Imagerie ultrasonore Moulage par transfert de résine sous vide Ultrasons Index. décimale : 668.4 Plastiques, vinyles Résumé : This article describes some experimental findings obtained from NDI results of VARTM aircraft structures. Inherent inspection difficulties due to the VARTM process, such as fiber waviness, surface creases and wrinkles, are discussed and some technical suggestions are given to overcome them. It is demonstrated that pulsed thermography and 3-D (Array) ultrasonic system are applicable for the inspection of the structure manufactured by VARTM process. 3-D ultrasonic system provides much higher quality NDI results compared with conventional ultrasonic system. Furthermore, this systemshows the ability to inspect the thickness change or complex shape part in highly integral VARTM structure. Pulsed thermography is an effective NDI tool to evaluate the depth and the area of the flaw especially in large area because of its fast inspection rate and easy operation. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8149 [article]

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Ultrasonic nondestructive evaluation of composite materials and structures / David K. Hsu in SAMPE JOURNAL, Vol. 46, N° 1 (01-02/2010)

[article]  inSAMPE JOURNAL > Vol. 46, N° 1 (01-02/2010) Titre : Ultrasonic nondestructive evaluation of composite materials and structures Type de document : texte imprimé Auteurs : David K. Hsu, Auteur Année de publication : 2010 Langues : Américain (ame) Catégories : Composites Construction sandwich Contrôle non destructif Imagerie ultrasonore Ultrasons Index. décimale : 620.112 Résistance et autres propriétés des matériaux, essais non destructifs Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8150 [article]

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