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Modellgestützte Berechnung der thermischen Belastung bei der Zerspanung von unidirektionalem CFK
Citation Link: https://doi.org/10.15480/882.8890
Publikationstyp
Doctoral Thesis
Date Issued
2023
Sprache
German
Author(s)
Advisor
Referee
Möhring, Hans-Christian
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2023-11-17
Institute
TORE-DOI
First published in
Number in series
52
Citation
Wissen schafft Innovation 52: (2023)
The primary challenges in milling of carbon fiber reinforced plastic (CFRP) workpieces are material and surface integrity as well as tool wear. Exacerbating these issues are high cutting zone temperatures which are inter alia difficult to assess due to steep temperature gradients. Furthermore, orientation of the fibers changes mechanical and thermal material properties.
Instead of CFRP laminates consisting of differently oriented layers, this thesis focuses on the simplified case of unidirectional (UD) CFRP. Thus, thermal effects originating from the fiber orientation angle between tool path and fibers can be studied selectively. Modeling the heating of the workpiece as a moving strip-shaped heat source, an analytical formulation of the resulting temperature field for linear tool paths is developed and validated using experimental data. This model enables the development of a numerical simulation tool for straight tool paths which also allows to study nonlinear effects exceeding the scope of the analytical model. In addition, an experimentally validated simulation for convex tool paths with defined radii shows the influence of fiber orientation and radius on the heat accumulation in convex UD-CFRP workpiece sections.
Instead of CFRP laminates consisting of differently oriented layers, this thesis focuses on the simplified case of unidirectional (UD) CFRP. Thus, thermal effects originating from the fiber orientation angle between tool path and fibers can be studied selectively. Modeling the heating of the workpiece as a moving strip-shaped heat source, an analytical formulation of the resulting temperature field for linear tool paths is developed and validated using experimental data. This model enables the development of a numerical simulation tool for straight tool paths which also allows to study nonlinear effects exceeding the scope of the analytical model. In addition, an experimentally validated simulation for convex tool paths with defined radii shows the influence of fiber orientation and radius on the heat accumulation in convex UD-CFRP workpiece sections.
Subjects
CFK
Unidirektional
Orthotrop
Zerspanung
Modellierung
Temperatur
DDC Class
650: Management, Public Relations
620: Engineering
Publication version
publishedVersion
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Mehnen_Dissertation_2023.pdf
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7.04 MB
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