Abstract
Defects such as cracks and inclusions act as sources of wave scattering when illuminated by an incident ultrasonic pulse through reflection, diffraction, and mode conversion. Interaction of elastic waves with cracks provides all the necessary information regarding the inverse characterization of the defects which has not yet been thoroughly solved. In the present work, a plane strain finite-element model has been developed to study the elastic wave propagation and scattering in general anisotropic media. The interaction of pulsed compression waves and Rayleigh waves with cracks in isotropic material has been studied. The wave interaction with an interface crack in a layered graphite/epoxy composite structure has been investigated. It predicts the mode-conversion and diffraction of waves by cracks. It is found that for quasi-longitudinal waves the displacement along the fiber is prominent, whereas for quasi-transverse, that displacement perpendicular to the fiber is prominent.
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