Startseite Residual heat generated during laser processing of CFRP with picosecond laser pulses
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Residual heat generated during laser processing of CFRP with picosecond laser pulses

  • Christian Freitag EMAIL logo , Leon Pauly , Daniel J. Förster , Margit Wiedenmann , Rudolf Weber , Taras V. Kononenko , Vitaly I. Konov und Thomas Graf
Veröffentlicht/Copyright: 6. März 2018
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Advanced Optical Technologies
Aus der Zeitschrift Advanced Optical Technologies Band 7 Heft 3

Abstract

One of the major reasons for the formation of a heat-affected zone during laser processing of carbon fiber-reinforced plastics (CFRP) with repetitive picosecond (ps) laser pulses is heat accumulation. A fraction of every laser pulse is left as what we termed residual heat in the material also after the completed ablation process and leads to a gradual temperature increase in the processed workpiece. If the time between two consecutive pulses is too short to allow for a sufficient cooling of the material in the interaction zone, the resulting temperature can finally exceed a critical temperature and lead to the formation of a heat-affected zone. This accumulation effect depends on the amount of energy per laser pulse that is left in the material as residual heat. Which fraction of the incident pulse energy is left as residual heat in the workpiece depends on the laser and process parameters, the material properties, and the geometry of the interaction zone, but the influence of the individual quantities at the present state of knowledge is not known precisely due to the lack of comprehensive theoretical models. With the present study, we, therefore, experimentally determined the amount of residual heat by means of calorimetry. We investigated the dependence of the residual heat on the fluence, the pulse overlap, and the depth of laser-generated grooves in CRFP. As expected, the residual heat was found to increase with increasing groove depth. This increase occurs due to an indirect heating of the kerf walls by the ablation plasma and the change in the absorbed laser fluence caused by the altered geometry of the generated structures.

Keywords: calorimetry; carbon fiber-reinforced plastics; CFRP; laser processing; residual heat

Acknowledgments

This work was supported by the German Research Foundation (DFG) within the project ‘Entrance’ (Funder Id: 10.13039/501100001659, grant GR 3172/17-1) and the Russian Foundation of Basic Research (grant 15-02-91347).

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Received: 2018-01-03
Accepted: 2018-02-13
Published Online: 2018-03-06
Published in Print: 2018-05-24

©2018 THOSS Media & De Gruyter, Berlin/Boston

Artikel in diesem Heft

  1. Cover and Frontmatter
  2. Views
  3. Disruptive: making lenses in a foundry
  4. Community
  5. News
  6. Topical Issue: Ultrafast Laser Matter Interaction
  7. Editorial
  8. The ultrafast laser is gearing up to become a tool for high-precision mass production – opportunities and challenges
  9. Review Articles
  10. Ablation dynamics – from absorption to heat accumulation/ultra-fast laser matter interaction
  11. Heat input and accumulation for ultrashort pulse processing with high average power
  12. Residual heat generated during laser processing of CFRP with picosecond laser pulses
  13. Ultrafast Bessel beams: advanced tools for laser materials processing
  14. Research Articles
  15. Residual heat during laser ablation of metals with bursts of ultra-short pulses
  16. Model of the final borehole geometry for helical laser drilling
  17. Atomistic simulations of ultra-short pulse laser ablation of aluminum: validity of the Lambert-Beer law
https://doi.org/10.1515/aot-2018-0001
Schlagwörter für diesen Artikel
calorimetry; carbon fiber-reinforced plastics; CFRP; laser processing; residual heat

Artikel in diesem Heft

  1. Cover and Frontmatter
  2. Views
  3. Disruptive: making lenses in a foundry
  4. Community
  5. News
  6. Topical Issue: Ultrafast Laser Matter Interaction
  7. Editorial
  8. The ultrafast laser is gearing up to become a tool for high-precision mass production – opportunities and challenges
  9. Review Articles
  10. Ablation dynamics – from absorption to heat accumulation/ultra-fast laser matter interaction
  11. Heat input and accumulation for ultrashort pulse processing with high average power
  12. Residual heat generated during laser processing of CFRP with picosecond laser pulses
  13. Ultrafast Bessel beams: advanced tools for laser materials processing
  14. Research Articles
  15. Residual heat during laser ablation of metals with bursts of ultra-short pulses
  16. Model of the final borehole geometry for helical laser drilling
  17. Atomistic simulations of ultra-short pulse laser ablation of aluminum: validity of the Lambert-Beer law
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