Designing of the Heating Process for Fiber- Reinforced Thermoplastics with Middle-Wave Infrared Radiators

Manufacturing components of fiber-reinforced thermoplastics requires three steps: heating the matrix, forming and consolidation of the composite and terminal cooling the matrix. For the heating process a pre-determined temperature distribution through the layers and the thickness of the pre-consolidated sheets is recommended to enable forming mechanism. Thus, a design for the heating process for forming composites with thermoplastic matrices is necessary. To obtain a constant temperature through thickness and width of the sheet, the heating process was analyzed by the help of the finite element method. The simulation models were validated by experiments with resistance thermometers as well as with an infrared camera. Based on the finite element simulation, heating methods for infrared radiators have been developed. Using the numeric simulation many iteration loops are required to determine the process parameters. Hence, the initiation of a model for calculating relevant process parameters started applying regression functions.

Authors:

• B. Engel
• M. Junge

Keywords:

• Fiber-reinforced thermoplastics
• heating strategies
• middle-wave infrared radiator.

References:

[1] G. Kempe, Duroplastische und Thermoplastische
Faserverbundwerkstoffe - Vorteile - Eigenschaften - Verarbeitung und
Anwendungsgebiete beider Werkstoffgruppen in:
Faserverbundwerkstofe mit thermoplastischer Matrix, Expert Verlag,
1997, pp. 64-68.
[2] A. M. Murtagh., J. J. Lennon, and P. J. Mallon, Surface friction effects
related to pressforming of continuous fibre thermoplastic composites.
Composites Manufacturing 6. Elsevier Science Limited : s.n., 1995,
pp. 169-175.
[3] C. Ludwig, Glasfaserverstärkte Kunststoffe unter hoher thermischer und
mechanischer Belastung, Dissertation, Institute for supporting
construction and constructive designing, University of Stuttgart, 2009.
[4] F. R. Jones, Glass fibres - type and form in Handbook of polymer-fibre
composites, Longman Scientific & Technical, Harlow, GB, 1994.
[5] U. Berthold, Beitrag zum Thermoformen gewebeverstärkter
Thermoplaste mittels elastischer Stempel, Dissertation, Faculty of
Mechanical Engineering and Process Technology, University of
Chemnitz, 2001.
[6] L. Bottenbruch, R. Binsack, Technische Thermoplaste,
Kunststoffhandbuch, Band , Carl Hanser Verlag, Munich Vienna,
p. 221, 1998.