Experimental and theoretical investigation of edge waves propagation and scattering in a thick plate with surface-breaking crack-like defect

Golub, Mikhail; Kuban State University; Russian Federation

Golub, M.V.; Kuban State University; Russia
Eremin, A.A.; Kuban State University; Russia
Wilde, M.V.; Saratov State University; Russia

ID: ECNDT-0295-2018
Download: PDF
Session: Modelling & data processing - Guided Waves
Room: J2
Date: 2018-06-13
Time: 14:10 - 14:30

In the present paper, we report the results of theoretical and experimental investigations of edge waves (EW) and Lamb guided waves (LW) excitation, propagation and diffraction in isotropic thick plates with a surface-breaking crack-like defect. In the experimental studies, being conducted for plate-like aluminium samples, EW and LW excitation is achieved by thin piezoelectric transducers adhered to a surface or an edge of the specimen. Laser Doppler vibrometry is employed to measure velocities on the surface of the plate. A computational model employed for the evaluation of EW dispersion properties and source-induced transient EW and LW time-space wave-fields in a thick plate is based on the three-dimensional linear elastodynamic theory for a half-bounded plate and the normal mode expansion technique. The present study focuses on the investigation of guided waves scattering by surface-breaking cracks of different depth at an edge. It is demonstrated that the intensity of EW reflection is steadily increasing with frequency.