激光激发板状分层材料的超声波场模拟

Simulation of Laser-generated Ultrasonic in Layered Planes by Spectral Element Method

针对均匀层状材料受线分布等效载荷作用时波的产生和传播的模拟过程,提出了一种新的动态刚度矩阵构造方法。采用激光等效力源,分别对有边界和无边界两种情况下板材料的单元动态刚度矩阵的频率变化特性进行了研究,给出了该方法构造的刚度矩阵频率响应变化,并对位移响应的求解过程进行了建模仿真。

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.