Investigation of surface acoustic waves in laser shock peened metals

被引：0

作者：

袁玲 ^{[1
]}

严刚 ^{[2
]}

沈中华 ^{[1
]}

徐杭威 ^{[1
]}

倪晓武 ^{[1
]}

陆建 ^{[1
]}

机构：

[1] Department of Applied Physics,Nanjing University of Science and Techonology,Nanjing

[2] College of Mathematics and Physics,Nanjing University of Posts and Telecommunications,Nanjing

来源：

Chinese Optics Letters | 2008年 / 11期

关键词：

PVDF;

D O I：

暂无

中图分类号：

O421 [声的原理];

学科分类号：

070206 ; 082403 ;

摘要：

<正>Laser shock peening is a well-known method for extending the fatigue life of metal components by intro- ducing near-surface compressive residual stress.The surface acoustic waves (SAWs) are dispersive when the near-surface properties of materials are changed.So the near-surface properties (such as the thickness of hardened layers,elastic properties,residual stresses,etc.) can be analyzed by the phase velocity disper- sion.To study the propagation of SAWs in metal samples after peening,a more reasonable experimental method of broadband excitation and reception is introduced.The ultrasonic signals are excited by laser and received by polyvinylindene fluoride (PVDF) transducer.The SAW signals in aluminum alloy mate- rials with different impact times by laser shock peening are detected.Signal spectrum and phase velocity dispersion curves of SAWs are analyzed.Moreover,reasons for dispersion are discussed.

引用

页码：837 / 840

页数：4

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