超声表面波在均匀弹性介质中传播的数值仿真  

NUMERICAL SIMULATION OF PROPAGATION OF SURFACE ULTRASONIC WAVE IN HOMOGENEOUS ELASTIC MEDIA

作　　者：阚文彬[1] 李勇峰[1] 朱合范[1] 潘红良[1] 

机构地区：[1]华东理工大学机械与动力工程学院,上海200237

出　　处：《计算机应用与软件》2012年第11期32-34,51,共4页Computer Applications and Software

基　　金：国家自然科学基金项目(50875084)

摘　　要：对半无限大弹性空间的垂直脉冲力的系统表面响应问题进行分析,建立以脉冲力函数作为等效载荷,一致性粘弹性吸收边界条件的二维有限元模型。模拟超声表面波在均匀弹性介质中的传播。对网格大小、吸收边界、时间步长等因素造成的数值频散误差进行分析,确定最优的模型参数。通过对节点的信号处理,得到的频散曲线与理论上相符合。该模型为超声表面波无损评价提供了仿真的基础。In this paper we analyse the issue of surface response of vertical pulse force in half infinite elastic space,and establish a two dimensional finite element model with the pulse force function as equivalent load and the consistent viscoelastic absorbing boundary condition（ABC）.The propagation of ultrasonic surface wave in homogeneous elastic media is simulated.Numerical dispersion errors caused by factors such as grid size,ABC,time step,etc.are analysed,and the model parameters are optimised.Dispersion curve obtained from node signal processing are in accordance with the theory.The model provides the fundament for simulation of non-destructive evaluation with ultrasonic surface wave.

关 键 词：超声表面波 有限元 数值频散 

分 类 号：TG115.285[金属学及工艺—物理冶金]