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
收藏
页码：3504 / 3509
页数：6
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