By Alex Vary (auth.), John C. Duke Jr. (eds.)
Finding and slzmg cracks and different crack-like discontinuities has been the guts of realization for scientists and engineers constructing and utilizing nondestructive assessment (NDE) know-how. even though, with complex mate rials being "engineered" and utilized in severe structural elements, a brand new for NDE has emerged. while many conventional engineering materi problem als fail as a result initiation and self-similar propagation of a crack, bolstered composite fabrics degrade and fail in a fashion extra analogously to the cave in of a constitution. as a result the NDE of such fabrics comprises assessing the mixed impact of the material's broken instead of deciding on and sizing unmarried severe imperfection. In 1979 Alex differ, looking to tackle the problem confronting the NDE of complex fiber strengthened composite fabrics begun paintings on a brand new approach to fabrics characterization. targeting the matter of comparing graphite fiber reinforcedl epoxy laminated plates; differ used a piezoelectric transducer to excite a mechanical disturbance in a plate and, with a sensi tive piezoelectric transducer monitored the disturbance at the similar floor of the plate. (Placing the transducers at the similar floor used to be basically for useful function yet their displacement towards expected carrier load used to be of primary significance!) To quantify this statement, he counted the variety of tours, of the ensuing electric sign, above a arbitrary voltage threshold; a approach usually used for acoustic emission sign analysis.
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Additional info for Acousto-Ultrasonics: Theory and Application
4 and 5 for waves propagating parallel and perpendieular to the fiber direetion, respeetively. In order to apply the shear deformation theory to multiply laminated eomposite plates, the seleetion of appropriate values for the shear eorreetion factors is neeessary.
E. Green, j. D. Carlyle, and P. Kukuchek, Impact Damage Epoxy Composites: Impact Testing and NDT Evaluation, in: "RP/C'83: Composite Solutions to Material Challenges, " Society of the Plastics Industry, New York (1983). 21 INTERACTION OF ULTRASONIC WAVES WITH LAYERED MEDIA Adnan H. Nayfeh and Timothy W. Taylor Dept. of Aerospace Engrg. & Engrg. Mechanics University of Cincinnati Cincinnati, OH 45221 ABSTRACT A unified theoretical treatment is presented for the interaction of ultrasonic waves with multilayered media.
A piezoelectric transducer, which acted as an acoustic generator, was excited by agated sine wave. The gated sine wave provided an excitation signal with a very narrow frequency band. A second piezoelectric transducer was used as a receiver. The position of the receiver was advanced a known distance, and the change in time for a particular phase point was noted on a digitizing oscilloscope. Dividing the displacement by the time yielded the phase velocity. Then, the wavenumber was calculated from the phase velocity for the frequency at which the measurement was obtained.
Acousto-Ultrasonics: Theory and Application by Alex Vary (auth.), John C. Duke Jr. (eds.)
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