Page 63 - 应用声学2019年第5期

第 38 卷 第 5 期 Vol. 38, No. 5
2019 年 9 月 Journal of Applied Acoustics September, 2019

⋄ 研究报告 ⋄

声表面波在圆弧处反射及透射的数值研究 ∗

张 政 赵金峰 潘永东 †

(同济大学 上海 200092)

摘要 为了研究直达表面波在圆弧过渡面处传播性能的变化，采用有限元方法模拟了热弹机制下，线性脉冲
激光辐照金属铝块表面时激发的表面波在近表面传播过程中，在不同曲率半径的圆弧处发生的反射及透射现
象，建立了圆弧半径与反射表面波以及透射表面波时域信号特征之间的联系。计算结果表明：曲率半径与表面
波中心波长的数值关系对表面波在圆弧处的传播有显著的影响；同时证明了根据透射表面波信号的到达时间
可以反演圆弧半径的大小，为之后利用表面波信号定量检测材料表面圆弧凹痕的深度提供了理论依据。
关键词 表面波，有限元，圆弧，反射，透射
中图法分类号: O426 文献标识码: A 文章编号: 1000-310X(2019)05-0815-09
DOI: 10.11684/j.issn.1000-310X.2019.05.009

Numerical study on reflection and transmission of surface acoustic waves at
circular arc

ZHANG Zheng ZHAO Jinfeng PAN Yongdong

(Tongji University, Shanghai 200092, China)

Abstract In order to study the change of propagation performance of the surface acoustic wave at circular
arc transitional surface, the finite element method (FEM) is used to simulate the reflection and transmission
phenomena of the surface acoustic waves excited by the linear pulse laser on the circular arc surface of the
aluminium block with various radius during the near-surface propagation, and the relationship between cir-
cular arc radius and time domain signal characteristics of reflected and transmitted surface acoustic waves is
established. The results show that, the numerical relationship between the radius of curvature and the central
wavelength of the surface acoustic wave has a significant influence on the propagation of the surface acoustic
wave at the circular arc. Furthermore, it is demonstrated that the radius of the circular arc can be inverted
according to the arrival time of the transmitted surface acoustic wave signal, which provides a theoretical basis
for quantitatively detecting the depth of the circular arc notch on the surface of the materials.
Key words Surface acoustic wave, Finite element, Circular arc, Reflected, Transmitted

2018-12-03 收稿; 2019-04-16 定稿
国家自然科学基金项目 (11872282)
∗
作者简介: 张政 (1994- ), 男, 安徽蚌埠人, 硕士研究生, 研究方向: 激光超声无损检测。
† 通讯作者 E-mail: ypan@tongji.edu.cn