Research On Solitary Waves With Composite Laminated Structures

The theory of nondestructive testing based on the interaction between highly nonlinear solitary waves and structures generated in one-dimensional particle chains has been developed.The feasibility of solitary wave detection has been demonstrated in some experimental studies.In this paper,the coupling effect between highly nonlinear solitary waves in one-dimensional particle chains and composite laminated structures has been studied by numerical calculation and finite element model.In this paper,the time and amplitude of incident wave and rebound wave are analyzed respectively,and the sensitivity of solitary wave to material properties and geometric properties of composite laminated structures is studied.The main research contents are as follows:1.The interaction between one-dimensional particle chains and semi-infinite composite laminates is studied.The differential equations of motion for the interaction between particle chains and semi-infinite composite laminates are derived.The curves of internal forces,velocities and displacements of particles with time under different elastic moduli are obtained by numerical calculation,and the sensitivity of solitary waves to the elastic modulus of semi-infinite composite laminates is explored.2.The interaction between one-dimensional particle chains and composite laminates is studied.The deflection equation at the point of action is deduced when the concentrated force acts on the laminates.The differential equations of motion of one-dimensional particle chains acting on composite laminates are established.The curves of internal forces,velocities and displacements of particles with time are obtained by numerical calculation under different thickness and different positions of action,and the solitary wave pair composite is explored.The effect of the thickness of material laminate and the position of particle chain on the rebound solitary wave is studied,and the effective range of using solitary wave to detect the defect of laminate is obtained.3.The finite element analysis model of one-dimensional particle chain interaction with composite laminates is established.By changing the elastic modulus,thickness and position of composite laminates,the curve of contact force between particles with time is obtained.The sensitivity of solitary waves to elastic modulus and position of composite laminates is explored.The results of finite element analysis and numerical calculation are compared.Furthermore,the influence of properties of composite laminates on solitary waves is analyzed.