Resonance excitation of surface capillary waves to enhance material removal for laser material processing
Abstract
Abstract The results of detailed experiments and high fidelity modeling of melt pool dynamics, droplet ejections and hole drilling produced by periodic modulation of laser intensity are presented. Ultra-high speed imaging revealed that melt pool oscillations can drive large removal of material when excited at the natural oscillation frequency. The physics of capillary surface wave excitation is discussed and simulation is provided to elucidate the experimental results. The removal rates and drill through times as a function of driving frequency is investigated. The resonant removal mechanism is driven by both recoil momentum and thermocapillary force but the key observation is the latter effect does not require evaporation of material, which can significantly enhance the efficiency for laser drilling process. We compared the drilling of holes through a 2 mm-thick Al plate at modulation frequencies up to 20 kHz. At the optimal frequency of 8 kHz, near the resonant response of the melt pool, the drilling efficiency is greater than 10x with aspect ratio of 12:1, and without the collateral damage that is observed in unmodulated CW drilling.
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1619748
- Alternate Identifier(s):
- OSTI ID: 1548386
- Report Number(s):
- LLNL-JRNL-760326
Journal ID: ISSN 2045-2322; 8152; PII: 44577
- Grant/Contract Number:
- AC52-07NA27344; 16-ERD-016
- Resource Type:
- Published Article
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Name: Scientific Reports Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION
Citation Formats
Ly, Sonny, Guss, Gabe, Rubenchik, Alexander M., Keller, Wesley J., Shen, Nan, Negres, Raluca A., and Bude, Jeff. Resonance excitation of surface capillary waves to enhance material removal for laser material processing. United Kingdom: N. p., 2019.
Web. doi:10.1038/s41598-019-44577-6.
Ly, Sonny, Guss, Gabe, Rubenchik, Alexander M., Keller, Wesley J., Shen, Nan, Negres, Raluca A., & Bude, Jeff. Resonance excitation of surface capillary waves to enhance material removal for laser material processing. United Kingdom. https://doi.org/10.1038/s41598-019-44577-6
Ly, Sonny, Guss, Gabe, Rubenchik, Alexander M., Keller, Wesley J., Shen, Nan, Negres, Raluca A., and Bude, Jeff. Fri .
"Resonance excitation of surface capillary waves to enhance material removal for laser material processing". United Kingdom. https://doi.org/10.1038/s41598-019-44577-6.
@article{osti_1619748,
title = {Resonance excitation of surface capillary waves to enhance material removal for laser material processing},
author = {Ly, Sonny and Guss, Gabe and Rubenchik, Alexander M. and Keller, Wesley J. and Shen, Nan and Negres, Raluca A. and Bude, Jeff},
abstractNote = {Abstract The results of detailed experiments and high fidelity modeling of melt pool dynamics, droplet ejections and hole drilling produced by periodic modulation of laser intensity are presented. Ultra-high speed imaging revealed that melt pool oscillations can drive large removal of material when excited at the natural oscillation frequency. The physics of capillary surface wave excitation is discussed and simulation is provided to elucidate the experimental results. The removal rates and drill through times as a function of driving frequency is investigated. The resonant removal mechanism is driven by both recoil momentum and thermocapillary force but the key observation is the latter effect does not require evaporation of material, which can significantly enhance the efficiency for laser drilling process. We compared the drilling of holes through a 2 mm-thick Al plate at modulation frequencies up to 20 kHz. At the optimal frequency of 8 kHz, near the resonant response of the melt pool, the drilling efficiency is greater than 10x with aspect ratio of 12:1, and without the collateral damage that is observed in unmodulated CW drilling.},
doi = {10.1038/s41598-019-44577-6},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United Kingdom},
year = {Fri May 31 00:00:00 EDT 2019},
month = {Fri May 31 00:00:00 EDT 2019}
}
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https://doi.org/10.1038/s41598-019-44577-6
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