Abstract
Laser shock peening (LSP) technology is a laser-induced shock process implemented as a surface enhancement technique to introduce beneficial compressive residual stresses into metallic components. The process employs water to confine and enhance the pressure pulse delivered to the target. For thick water layers, or fully water immersed LSP, a cavitation bubble is generated by the surface vaporization of the LSP laser pulse. This research shows that the first bubble oscillation period of the cavitation bubble can be used to characterize effective and repeatable energy delivery to the target. High-speed shadowgraphy is implemented to show that variations in the bubble period occur before visual observations of dielectric breakdown in water. The diagnostic potential of the first bubble oscillation period is used to identify the dielectric breakdown threshold of water, which shows an increase with increasing water quality measured by water conductivity.
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Acknowledgements
This work was supported by the Rental Pool Program at the National Laser Centre within the Council for Scientific and Industrial Research, the DST-NRF Centre of Excellence in Strong Materials (CoE-SM), the National Aerospace Centre (NAC), and the Flow Research Unit (FRU) at the University of the Witwatersrand. The authors are also grateful to Microsep (Pty) Ltd and the School of Chemistry at the University of the Witwatersrand for support regarding purified water and water conductivity measurements.
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Glaser, D., Polese, C. Cavitation bubble oscillation period as a process diagnostic during the laser shock peening process. Appl. Phys. A 123, 603 (2017). https://doi.org/10.1007/s00339-017-1209-6
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DOI: https://doi.org/10.1007/s00339-017-1209-6