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Acoustic Signature Measurement to Identify Laser-Induced Breakdown in Water during Laser Shock Peening.

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Title: Acoustic Signature Measurement to Identify Laser-Induced Breakdown in Water during Laser Shock Peening.
Authors: Böhm, Marek1,2, Blažej, Josef2, Stránský, Ondřej1,3, Kaufman, Jan1, Brajer, Jan1,3, Pathak, Sunil1,3,4 sunil.pathak@hilase.cz, Mocek, Tomáš1
Source: Journal of Laser Micro / Nanoengineering. Aug2025, Vol. 20 Issue 2, p139-145. 7p.
Subjects: Acoustic emission testing, Acoustic emission, Aqueous solutions, Laser-induced breakdown spectroscopy, Residual stresses, Laser peening, Deformations (Mechanics), Process optimization
Abstract: A prevalent non-destructive evaluation method for identifying and analyzing the acoustic waves produced by material deformation and damage is acoustic emission monitoring. In this work, laser shock peening was used in conjunction with acoustic emission monitoring. To determine the acoustic event of laser-induced breakdown in water, the acoustic signals were analyzed. To attain the required compressive residual stresses and prevent undesirable damage, the acoustic emission signals can also be utilized to optimize the laser shock peening parameters, such as the laser energy and spot size. Thus, to investigate the possibilities of acoustic emission monitoring as a tool for the in-situ characterization of laser shock peening, offering insights into the underlying physical processes and help improving the quality of the treated parts. It was found that the plasma breakdown during the laser shock peening intensely hinders the performance as a compressive residual stress on the surface were observed halved (from -216 MPa to -82 MPa) when comparing the setups with and without the plasma breakdown. Thus, by utilizing the acoustic signals the harmful laser-induced breakdown can be detected and optimizing it can enhance process efficacy. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Laser Micro / Nanoengineering is the property of Japan Laser Processing Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Acoustic Signature Measurement to Identify Laser-Induced Breakdown in Water during Laser Shock Peening.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Laser+Micro+%2F+Nanoengineering%22">Journal of Laser Micro / Nanoengineering</searchLink>. Aug2025, Vol. 20 Issue 2, p139-145. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Acoustic+emission+testing%22">Acoustic emission testing</searchLink><br /><searchLink fieldCode="DE" term="%22Acoustic+emission%22">Acoustic emission</searchLink><br /><searchLink fieldCode="DE" term="%22Aqueous+solutions%22">Aqueous solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Laser-induced+breakdown+spectroscopy%22">Laser-induced breakdown spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Residual+stresses%22">Residual stresses</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+peening%22">Laser peening</searchLink><br /><searchLink fieldCode="DE" term="%22Deformations+%28Mechanics%29%22">Deformations (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Process+optimization%22">Process optimization</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A prevalent non-destructive evaluation method for identifying and analyzing the acoustic waves produced by material deformation and damage is acoustic emission monitoring. In this work, laser shock peening was used in conjunction with acoustic emission monitoring. To determine the acoustic event of laser-induced breakdown in water, the acoustic signals were analyzed. To attain the required compressive residual stresses and prevent undesirable damage, the acoustic emission signals can also be utilized to optimize the laser shock peening parameters, such as the laser energy and spot size. Thus, to investigate the possibilities of acoustic emission monitoring as a tool for the in-situ characterization of laser shock peening, offering insights into the underlying physical processes and help improving the quality of the treated parts. It was found that the plasma breakdown during the laser shock peening intensely hinders the performance as a compressive residual stress on the surface were observed halved (from -216 MPa to -82 MPa) when comparing the setups with and without the plasma breakdown. Thus, by utilizing the acoustic signals the harmful laser-induced breakdown can be detected and optimizing it can enhance process efficacy. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Laser Micro / Nanoengineering is the property of Japan Laser Processing Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.2961/jlmn.2025.02.2007
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 139
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      – SubjectFull: Acoustic emission testing
        Type: general
      – SubjectFull: Acoustic emission
        Type: general
      – SubjectFull: Aqueous solutions
        Type: general
      – SubjectFull: Laser-induced breakdown spectroscopy
        Type: general
      – SubjectFull: Residual stresses
        Type: general
      – SubjectFull: Laser peening
        Type: general
      – SubjectFull: Deformations (Mechanics)
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      – SubjectFull: Process optimization
        Type: general
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      – TitleFull: Acoustic Signature Measurement to Identify Laser-Induced Breakdown in Water during Laser Shock Peening.
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            NameFull: Böhm, Marek
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            NameFull: Blažej, Josef
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            NameFull: Stránský, Ondřej
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            NameFull: Kaufman, Jan
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            – D: 01
              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
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