Reflection and transmission of guided ultrasonic plate waves by vertical stiffeners
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2014-07-02
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AIP Publishing LLC
Abstract
Ultrasonic guided waves are very useful for structural health monitoring. They have the potential to interrogate and detect damage in a structure over a large area with few transducers. Guided plate modes (Lamb waves) are used and proposed for damage detection at a distance in semi-monococque structures such as airplane fuselages and spacecraft structures. The interaction of guided plate waves with stiffening members such as ribs, stringers, or the integral stiffeners used in spacecraft structures limits the distance over which structural health monitoring non-destructive evaluation systems can detect damage. This paper develops a simple explanatory model for the scattering of low-order ultrasonic Lamb waves crossing a stiffening device. The model illuminates the underlying mechanics of waves crossing a stiffener. The model shows that stop-bands for transmission of S0
(longitudinal pressure) waves across a stiffener line up with flexural resonances of the stiffener. It also demonstrates why transmission of A0
(flexural) waves is more complicated and harder to predict. The model is shown to agree well with both boundary element method calculations and experimental measurements.
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This article appeared in Reusser, Ricky S., Stephen D. Holland, D. E. Chimenti, and Ron A. Roberts. "Reflection and transmission of guided ultrasonic plate waves by vertical stiffeners." The Journal of the Acoustical Society of America 136, no. 1 (2014): 170-182, and may be found at
DOI: 10.1121/1.4883386.
Copyright 2014 Acoustical Society of America.
Posted with permission.