Fundamental Study on Numerical Modeling of Local Defect Resonance

Abstract

Excitation of local defect resonances (LDR) using a relatively high-frequency vibration to estimate various quantities of defects has been reported. To investigate the characteristics of the LDR, numerical modelings of LDR were conducted in this study. The finite element method (FEM) and boundary element method (BEM) for a model containing a crack were implemented to obtain the LDR frequencies. Since the FEM outputs not only LDR but also whole domain resonance, we found it troublesome to extract the LDR solution. On the other hand, the BEM based on the crack discretization provides only LDR solutions caused by the crack.