線集束超音波探触子により励起された漏洩表面波伝播の有限要素法解析

概要

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Propagation of the leaky Rayleigh and creeping waves, which are excited by a line-focused transducer, have been analyzed numerically under plane strain by finite element method. The analyzed model is composed of a line-focused transducer, coupling water and an aluminum plate. The wave equation of pressure in water and those of displacements for a solid are discretized with linear triangular finite elements. A new data structure is constructed to improve efficiency of calculation by using reference index tables which minimize memory size. Nonreflecting boundaries are applied at the outer boundaries of the plate to remove reflection at the external boundaries of the solid. The calculated velocities of the leaky Rayleigh and creeping waves at the water-aluminum interface are close to the measured velocities. The attenuation constant of the leaky Rayleigh wave is in good agreement with the theoretical value at the central frequency of the transducer used.
一般社団法人日本機械学会の論文
1999-03-25