Finite element analysis of the Rayleigh wave scattering in isotropic bi-material wedge structures.
The numerical study is performed of the harmonic Rayleigh wave scattering in a composite structure constructed from two elastically isotropic 90°-wedges. These wedges are in contact along one pair of their faces. It is assumed that either the perfectly sliding contact or the perfectly rigid one is realized. The other pair of faces forms a plane border between the resulting bi-material wedge and the exterior half-infinite space occupied by vacuum. The finite element method is used. The perfectly matched layer spatially confines the computational domain. The dependences of the reflection and transmission coefficients of the Rayleigh wave on the angle of incidence, the Poisson ratio and the type of contact are obtained and analyzed for different combinations of materials. The behavior of the coefficient of the Rayleigh wave conversion into the interfacial wave which may exist on the internal boundary of the structure is also investigated. A number of relations between the coefficients of conversion are derived from symmetry considerations for structures with sliding contact and composed of identical isotropic materials.
Institute of Crystallography FSRC "Crystallography and Photonics", Russian Academy of Sciences, Leninskii pr. 59, Moscow 119333, Russia; National University of Science and Technology "MISIS", Leninsky pr. 4, Moscow 119049, Russia. Electronic address: alexandre_dar@mail.ru.
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Darinskii
IFW Dresden, SAWLab Saxony, P.O. 27 00 16, D-01171 Dresden, Germany; InnoXacs, Am Muehlfeld 34, D-01744 Dippoldiswalde, Germany.
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Weihnacht
IFW Dresden, SAWLab Saxony, P.O. 27 00 16, D-01171 Dresden, Germany.
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Schmidt
Rayleigh wave; Reflection and transmission; Wedge structures