Author(s)

M. Kitahara, T. Ichino, K. Nakahata & M. Yamada

Abstract

Application of elast odynarnic BEM to ultrasonic NDE M. Kitahara, T. Ichino, K. Nakahata & M. Yamada Department of Civil Engineering, Tohoku University, Japan Abstract The elastodynamic boundary element method is applied to the ultrasonic nondestructive evaluation with an emphasis on visualization of the scattered wave field around flaws. First, the unknown quantities on the flaw boundaries are determined by the boundary element method. Then near field calculations are performed by using the integral representation of the scattered wave field. The calculated near fields are visualized in the vicinity of flaws. The results of the near field visualization are useful to interpret the far field backscattered waveforms. The backscattered waveforms at the transducer position are obtained from the far field expression of the scattered wave. It is shown from the numerical examples that the combination of the far field backscattered waveform and the near field visualization makes it possible to charact

Keywords