Cracks and delamination

Diffraction of elastic waves by internal obstacles (cracks, cavities, inclusions) and resonance effects observed in the diffracted field are of interest in the development of wave methods for location and identification of defects and in problems of the strength and fracture of materials and structures. In addition, the character of propagation and blocking of traveling waves is of special interest.

Phenomena of resonance capture and blocking have been considered by the examples of an elastic aveguide with an obstacle in the form of a single horizontal crack. On the basis of analytic-computational solution of the corresponding diffraction problems, we analyzed the distribution of spectral points in the complex frequency plane as a function of crack size and position in the waveguide; we also analyzed their effect on the frequency characteristics of signal propagation and reflection.