二维圆环结构中弹性波传播的谱单元分析

为研究弹性波在结构中的波场特征,推导建立一种任意四边形二维谱单元,将其应用于二维圆环结构中的波传播行为模拟.以矩形平板结构中弹性导波传播分析为例,通过与传统有限元分析结果对比,验证所建立谱单元的有效性.有裂纹和无裂纹二维圆环结构谱单元模拟结果表明:弹性波在圆环结构中传播会发生频散;圆环结构表面的裂纹对瑞利波的传播影响最大;根据其反射波包位置可以确定损伤位置.

Spectral element analysis on elastic wave propagation in 2D ring structure

To study the characteristics of elastic wave field, a new arbitrary quadrangle 2D spectral element was developed to analyze the behavior of wave propagation is a 2D ring. A numerical example of wave propagation in a rectangle planar structure was investigated to validate the element by comparing the spectral element analysis results to finite element analysis results. A 2D ring structure with and without crack were studied by the proposed spectral element. The results show that there happens the phenomena of frequency disperse in the process of wave propagation; Rayleigh wave is affected most by the crack in the surface of ring and the location of crack can be identified through identification of the position of the reflected wave package.