关键词: FFT, 分层板材料, 激光超声

Abstract:

This paper presents a novel derivation to construct dynamic stiffness matrix of wave generation and propagation in homogeneous medium forced by line distribution loading.The frequency response of element dynamic stiffness is studied in both non-boundaries and boundaries conditions.Dynamic stiffness of the spectral element layer and the throw-off element as a function of frequency parameter for the plane case are given.An element matrix similar to finite element is proposed,which is referred to as spectral finite element method.And the modeling is established according to the matrixes to obtain the displacement response.

Key words: FFT;layered planes;laser generated ultrasonic