第１部門④

[2A28-33-05] Time-reversal focusing of elastodynamic scattered waves from a crack in a reverberating environment

*Kazushi Kimoto¹, Takahiro Saitoh² (1. Okayama University, 2. Gunma University)

Keywords:time-reversal focusing, ultrasonic wave, scattered wave, crack

In this study, time-reversal focusing fields are reconstructed numerically from measured ultrasonic signals. In the ultrasonic measurement, reverberating field is excited in a T-shape joint specimen with and without a simulated crack. The measured waveforms are time-reversed and back-propagated in numerical finite-difference models of the specimen. It is found as a result that the scattered fields back-focus successfully to the scattering sources, and thus the wave components useful for the flaw detection may be retrieved from the reverberating waveforms.