20 April 2012 Multiple scattering of Lamb waves by multiple corrosion pits in a plate
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Abstract
The scattering of Lamb waves from multiple corrosion pits on the surface of a plate is investigated. Previous work produced a model which solved for the scattered field when a Lamb wave is incident on a single corrosion pit, and we present an improvement on that model, and use it to study the case of multiple corrosion pits. The solution technique solves for the scattered field by replacing the corrosion pits with equivalent point loads applied to the surface of the plate, and the reciprocity theorem is used to calculate the scattered field. For the case of multiple corrosion pits, an implicit set of equations are derived using the self consistent method, and an approximation is advanced which results in an explicit set of equations which approximate the scattered field. The second order approximation to the multiple scattering problem is considered and solved semi-analytically for an ensemble of corrosion pits.
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Brandon W. Strom, Brandon W. Strom, Sridhar Krishnaswamy, Sridhar Krishnaswamy, Jan D. Achenbach, Jan D. Achenbach, } "Multiple scattering of Lamb waves by multiple corrosion pits in a plate", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 834813 (20 April 2012); doi: 10.1117/12.915127; https://doi.org/10.1117/12.915127
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