A three-dimensional dyadic Green's function for elastic waves in multilayer cylindrical structures
The three-dimensional dyadic Green's function for multilayer cylindrical structures is very important for solutions of elastic waves with arbitrary sources in such media. Both the primary and reflected parts of this Green's function are expressed as a Fourier integral in z (axial coordinate) and a Fourier series in 0 (azimuthal coordinate). In this spectral domain, the reflection matrices can be found recursively by using the boundary conditions at the layer interfaces. Inverse transforming this solution yields the dyadic Green's function in the spatial domain. The Green's function derived and implemented is applicable to arbitrary cylindrically layered media, including three types of interfaces: (i) fluid/solid interfaces, (ii) well-bonded solid/solid interfaces, and (iii) unbonded solid/ solid interfaces. Various numerical results from previous methods for simpler cases and several specially designed simulations validate the numerical implementation. With the Green's function, one can solve for fields due to an arbitrary source located at an arbitrary position using the superposition principle. This provides a powerful tool for the modeling of effects from defects and material inhomogeneities in cylindrical structures. © 1995, Acoustical Society of America. All rights reserved.
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