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

Determination of Surface Stress Distributions in Steel Using Laser-Generated Surface Acoustic Waves
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使用激光产生的表面声波确定钢中的表面应力分布

DOI:
10.1143/jjap.47.3504
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发表时间:
2008-05
影响因子:
1.5
通讯作者:
Shi Yifei
Shi Yifei
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Ni Xiaowu;Ni Chenyin;Shen Zhonghua;Lu Jian;Shi Yifei

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利用脉冲激光激发高频声表面波(SAW),并用专门设计的聚偏氟乙烯(PVDF)换能器检测表面应力分布。对两种受力表面进行了实验检验。一种是在简单弯曲力作用下弹性变形的钢板,其表面应力变化缓慢。另一种是焊接钢板,其表面应力在靠近焊缝的小区域内变化非常迅速。应用相关技术发展起来的一种新的信号处理方法,高分辨率地获得了这两个样品中反映应力分布的锯片速度分布。
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: 10.1063/1.1472997
发表时间: 2002-05
期刊: Quantitative Nondestructive Evaluation
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