Analysis on resonance scattering characteristics of cylinder in elastic matrix and experimental evaluation of interfacial stiffness between matrix and cylinder

Abstract

The resonance scattering theory of elastic waves in a cylinder with a spring interface between the matrix and the cylinder is theoretically investigated. The analysis shows that the resonance scattering theory is applicable not only to the model with a perfectly bonded cylinder-matrix interface but also to the model with a spring interface. The resonance scattering theory for a cylinder with a spring interface is an extension of the previous analysis, since the boundary condition for perfect bond is the limit of the spring stiffness at infinity. In addition, backscattered waves from the steel cylinder press-fitted into the aluminum alloy were measured. The interfacial stiffness was estimated by comparing the experimentally obtained amplitude spectrum with the results of the numerical analysis. It was confirmed that the spring interface adequately models the resonance wave scattering of the specimen.