EFFECT OF INTERFACE LAYERS ON MULTIPLESCATTERING AND DYNAMIC STRESS CONCENTRATIONOF ELASTIC WAVES IN A FIBER-REINFORCED COMPOSITE

摘要

In this paper, multiple scattering of elastic waves and dynamic stress concentrations inrna fiber-reinforced composite with two scatterers have been studied, the analytical expressions ofrnelastic waves in different material region have been presented and an analytic method to solve thisrnproblem has been established. The mode coefficients of elastic waves have been determined inrnaccordance with the continuous conditions of displacement and stress on the boundary of therninterfaces. By making use of the addition theorem of Hankel functions, the formulations ofrnscattered wave fields in different local coordinates have been transformed into those in one localrncoordinate to determine the unknown coefficients and dynamic stress concentration factors. Therninfluence of distance between two scatterers, material properties and structural size on the dynamicrnstress concentration factors near the interfaces has been analyzed. It indicates in the analysis thatrnthese three factors have great influence on the dynamic properties of fiber-reinforced compositernnear the interfaces. As examples, the numerical results of dynamic stress concentration factors nearrnthe interfaces in a fiber-reinforced composite are presented and discussed.