Influence Of Core-shell Structure With Surface Effect On Elastic Wave Scattering

Nano core-shell structure has the characteristics of simple preparation and large specific surface area.It is a kind of nanocomposite structure with good application prospect.The leading research institutions are trying to apply it to energy storage,sensor and micro action.The micro scale properties such as surface effect and interface effect affect the dynamic mechanical properties of core-shell structure,which brings great challenges to the structural design,manufacturing and service performance prediction.Based on the classical theory of surface elasticity,this paper considers the influence of surface energy,interface defects and interference on elastic wave scattering at nanometer scale,further improve the mechanical model of the dynamic response of the core-shell structure,and focuses on the dynamic stress concentration caused by elastic wave scattering.Aiming at the interface of core-shell structure,a new interface mechanical model is proposed in this paper,which uses the linear spring model to describe the imperfect interface.The eigenfunction expansion method and Graf addition theorem are used to solve the elastic wave problem.The purpose of this research is to analyze the influence of material properties and geometric parameters of core-shell structure with surface effect on its mechanical response,and to reveal the physical phenomenon and mechanical law of dynamic stress concentration at the interface of core-shell structure.The research results will provide theoretical basis for the modification of nanocomposites and the design and processing of nanostructured components.