Acousto-Ultrasonics: Theory and Application
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Bibliographische Detailangaben
1. Verfasser: Duke, John C. (VerfasserIn)
Format: Elektronisch E-Book
Sprache:English
Veröffentlicht: Boston, MA Springer US 1988
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Beschreibung:Finding and sizing cracks and other crack-like discontinuities has been the center of attention for scientists and engineers developing and using nondestructive evaluation (NDE) technology. However, with advanced materials being "engineered" and used in critical structural components, a new for NDE has emerged. Whereas many traditional engineering materials­challenge fail due to the initiation and self-similar propagation of a crack, reinforced composite materials degrade and fail in a manner more analogously to the collapse of a structure. Consequently the NDE of such materials involves assessing the combined effect of the material's damaged condition rather than identifying and sizing single critical imperfection. In 1979 Alex Vary, seeking to address the challenge confronting the NDE of advanced fiber reinforced composite materials began work on a new method of materials characterization. Focusing on the problem of evaluating graphite fiber reinforcedl epoxy laminated plates; Vary used a piezoelectric transducer to excite a mechanical disturbance in a plate and, with a sensitive piezoelectric transducer monitored the disturbance on the same surface of the plate. (Placing the transducers on the same surface was primarily for practical purpose but their displacement in the direction of anticipated service load was of fundamental significance!) To quantify this observation, he counted the number of excursions, of the resulting electrical signal, above a arbitrary voltage threshold; a procedure frequently used for acoustic emission signal analysis
Beschreibung:1 Online-Ressource (IX, 353 p)
ISBN:9781475719659
9781475719673
DOI:10.1007/978-1-4757-1965-9

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