Honarvar F., Sodagar S., Sinclair A.

In this paper, a mathematical model for the scattering of a plane acoustic wave incident at an arbitrary angle on an encased clad rod is developed. The model is based on the normal-mode expansion method. The solid matrix around the cylinder precludes the appearance of the leaky Rayleigh modes that dominate the spectrum of an immersed cylinder. Instead, interfacial modes contributing to the scattered spectrum are observed. These modes could be instrumental in the development of ultrasonic nondestructive evaluation techniques for assessment of the matrix-fiber bonds in fiber reinforced composite materials. The presence of a solid matrix that supports shearing action leads to scattered compression and shear waves with polarization components in both the axial direction and plane. The model has been verified on various simpler cases, such as embedded solid cylinder and immersed clad rods. Work in underway to establish the conformity of the results with experimental data.