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

作者：Shi Yifei^*; Ni Chenyin; Shen Zhonghua; Ni Xiaowu; Lu Jian

来源：Japanese Journal of Applied Physics, 2008, 47(5): 3504-3509.

DOI：10.1143/JJAP.47.3504

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

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]

• 出版日期2008-5
• 单位南京理工大学