Abstract
This chapter is dedicated to the study of ultrasonic guided waves propagating in thin-wall composite structures typical of aerospace applications. The chapter briefly discusses the several methods and methodologies that exist for finding the dispersion curves and modeshapes of guided-wave propagation in composite materials: global matrix method (GMM), transfer matrix method (TMM), stiffness matrix method (SMM), etc. Their common foundation lies in the Christoffel equations adapted to the case of a composite lamina through the imposition of the generalized Snell law, which yields six partial waves that overlap to give the solution for guided-wave propagation in a composite lamina. The analysis of a composite laminate is performed by assembling the wave propagation in the constitutive laminae and imposing as boundary conditions displacement and traction continuity at the interface between two adjacent laminae, as well as traction-free boundary conditions at the upper and lower faces of the laminate.
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