15 November 1996 Applications of advanced waveform-based AE techniques for testing composite materials
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Abstract
Advanced waveform based acoustic emission (AE) techniques have been previously used to evaluate damage progression in laboratory tests of composite coupons.In these tests, broad band, high fidelity acoustic sensors were used to detect signals which were then digitized and stored for analysis. Analysis techniques were based on plate model wave propagation characteristics. This approach, more recently referred to as Modal AE, provides an enhanced capability to discriminate and eliminate noise signals from those generated by damage mechanism. This technique also allows much more precise source location than conventional, threshold crossing arrival time determination techniques. To apply Modal AE concepts to the interpretation of AE on larger composite structures, the effects of wave propagation over large distances and through structural complexities must be well characterized and understood. In this research, measurements were made of the attenuation of the extensional and flexural plate mode components of broad band simulated AE signals in large composite panels. As these materials have applications in a cryogenic environment, the effects of cryogenic insulation on the attenuation of plate mode AE signals were also documented.
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William H. Prosser, "Applications of advanced waveform-based AE techniques for testing composite materials", Proc. SPIE 2944, Nondestructive Evaluation of Materials and Composites, (15 November 1996); doi: 10.1117/12.259053; http://dx.doi.org/10.1117/12.259053
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KEYWORDS
Signal attenuation

Composites

Sensors

Wave propagation

Cryogenics

Lead

Wave plates

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