光弾性法を用いた接着部での群速度0のラム波の伝搬挙動の評価

抄録

The purpose of this study is to visualize the behavior of Lamb waves with zero group velocity propagating in an adhesive bonding joint consisting of two glass plates using the photoelastic method. Peak position of principal stress difference along the thickness in the ZGV Lamb waves for a well-bonded specimen measured by the photoelastic technique is on or near the adhesive interface, whereas for the weak bonded specimens, the position is slightly departed from the adhesive interface. Additionally, the FDTD (Finite difference time domain) method was used to calculate the propagation behavior of ZGV Lamb waves. The calculated principal stress difference along the thickness direction resembled the measured brightness profile by the photoelastic method for the well-bonded specimen. The difference in the profiles between the calculation and the measurement would be caused by the frequency width in the source of the ZGV Lamb waves.