This paper develops an averaging technique based on the combination of eigenfunction expansion method and collaboration to investigate multiple scattering effect SH wave propagation in a porous medium. The semi-analytical is conducted using Monto Carlo understand macroscopic dispersion attenuation phenomena stress solid due effects. verified by finite element analysis. Finally, simple homogeniz...

Interfaces in elastic media need not be in welded contact. For instance, fractures allow a small amount of slip to occur along their surfaces during the passage of a seismic wave. By slip, we mean that the displacement across the interface can be discontinuous. Reflection and transmission of plane waves in this case are frequency dependent. Previous numerical studies have chosen the finite-diff...

This work is concerned with the diffraction and scattering of plane electro-acoustic waves by an interfacial crack between two dissimilar piezoelectric half-spaces. An exact solution is obtained for the full scattering field around the tip of the interfacial crack that is loaded with both acoustic SH and electric incident waves. First, it has been found that the interfacial crack is not complet...

The ultrasonic wave is applied as an inspection method for the gas-holder and the pipeline in service. In such an inspection, the application of an automatic inspection system is desirable, because a manual inspection is difficult to accomplish perfectly and exactly due to its enormity, a so-called nondestructive inspection robot is then preferable. However, an ultrasonic nondestructive inspect...

The single-pass second-harmonic generation (SHG) of a vortex beam under low fundamental wave depletion is systematically studied. Vortex modes at 1064 nm with integer topological charges from ±1 to ±9 and fractional ones ±0.75 are generated by modulating the Gaussian different spiral phase plates. frequency doubling these realized via SHG through KTP. A detailed theoretical model set up in beam...

The study uses complex variable functions and conformal mapping to investigate the scattering dynamic stress concentration phenomena of SH waves in non-circular opening magnetic–elastic materials. Elastic dynamics piezomagnetic equations are employed derive expressions for scattered wave intensity coefficient around openings. Special attention is devoted elliptical openings, where different inc...

Research into ultrasonic guided wave non-destructive testing for the long range inspection of large metallic structures is now well advanced. The main advantage of this method is that a large area can be covered from a given transducer position, so avoiding expensive scanning of all the structure surface. However, in the presence of attenuative coatings the test range can be dramatically reduce...