Determination of Surface Stress Distributions in Steel Using Laser-Generated Surface Acoustic Waves

被引：2

作者：

Shi Yifei ^{[1
]}

Ni Chenyin ^{[1
]}

Shen Zhonghua ^{[1
]}

Ni Xiaowu ^{[1
]}

Lu Jian ^{[1
]}

机构：

[1] Nanjing Univ Sci & Technol, Dept Appl Phys, Sch Sci, Nanjing 210094, Peoples R China

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2008年 / 47卷 / 05期

关键词：

ultrasonic velocity measurement; surface stress distribution; laser-generated surface acoustic waves (SAWs); applied stress; welding stress;

D O I：

10.1143/JJAP.47.3504

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

High frequency surface acoustic waves (SAWs) are excited by a pulsed laser and detected by a specially designed poly(vinylidene fluoride) (PVDF) transducer to investigate surface stress distribution. Two kinds of stressed surfaces are examined experimentally. One is a steel plate elastically deformed under simple bending forces, where the surface stress varies slowly. The other is a welded steel plate for which the surface stress varies very rapidly within a small area near the welding seam. Applying a new signal processing method developed from correlation technique, the velocity distribution of the SAWs, which reflects the stress distribution, is obtained in these two samples with high resolution. [DOI: 10.1143/JJAP.47.3504]

引用

页码：3504 / 3509

页数：6