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Calibrated heat flow model for the determination of different heat-affected zones in single-pass laser-cut CFRP using a cw CO2 laser

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Abstract

Laser machining has great potential for automated manufacturing of parts made of carbon-fiber-reinforced plastic (CFRP) due to the nearly force and tool-wear free processing. The high vaporization temperatures and the large heat conductivity of the carbon fibers, however, lead to unintentional heat conduction into the material causing damage in zones close to the process. In this paper, the matrix damage zone (MDZ) is subdivided into a matrix sublimation zone (MSZ) where the matrix material was sublimated and a zone where the temperature temporarily exceeded a value causing structural damage in the matrix. In order to investigate the extent of these zones, a one-dimensional heat flow model was applied, which was calibrated by cutting experiments using temperature sensors embedded in the CFRP samples. The investigations showed that the extents of the MSZ and MDZ are dominated by a total interaction time, which includes the passage of the laser beam and the continued interaction of the cloud of hot ablation products with the carbon fibers at the kerf wall and that from a practical point of view, the experimentally determined effective heat conductivity is suitable for simple estimations of the heat-affected zones in CFRP.

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Acknowledgments

This work was supported by the German Federal Ministry of Education and Research (BMBF) within the Framework Project “Research for Tomorrow’s Production” (FlexiCut, 02PJ2207) and managed by the Project Management Agency Karlsruhe (PTKA).

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Authors and Affiliations

  1. Trumpf Laser und Systemtechnik GmbH, Johann-Maus-Str. 2, 71254, Ditzingen, Germany

    P. Mucha & N. Speker

  2. Institut für Strahlwerkzeuge, University of Stuttgart, Pfaffenwaldring 43, 70569, Stuttgart, Germany

    P. Berger, R. Weber & T. Graf

  3. GKN Aerospace Deutschland GmbH, Brunhamstr. 21, 81249, Munich, Germany

    B. Sommer

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  1. P. Mucha
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  2. P. Berger
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  3. R. Weber
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  6. T. Graf
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Correspondence to P. Mucha.

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Mucha, P., Berger, P., Weber, R. et al. Calibrated heat flow model for the determination of different heat-affected zones in single-pass laser-cut CFRP using a cw CO2 laser. Appl. Phys. A 118, 1509–1516 (2015). https://doi.org/10.1007/s00339-014-8932-z

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  • DOI: https://doi.org/10.1007/s00339-014-8932-z

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