&lt;title&gt;NDE of zinc layer on steel substrate using laser-ultrasonic SAW&lt;/title&gt;

Chenni, B.; Moreau, A.; Pouliquen, J.

doi:10.1117/12.469621

Cited by 2 publications

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“…Ruiz et al discussed the effect of peening intensity and surface roughness on surface wave velocity for shot peened materials [4] . Using transducer excitation and optical receiver to test surface acoustic waves (SAWs), Chenni et al evaluated the elastic properties of the hardened steel which was regarded as a two-medium system (two layers of materials) [5] .…”

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Investigation of surface acoustic waves in laser shock peened metals

et al. 2008

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Laser shock peening is a well-known method for extending the fatigue life of metal components by introducing 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 dispersion. 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 materials 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.

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confidence: 99%