Influence of the cooling behaviour on mechanical properties of carbon fibre-reinforced thermoplastic/metal laminates

Authors

  • Camilo Zopp Technische Universität Chemnitz
  • Daisy Nestler Department of Lightweight Structures and Polymer Technology, Technische Universität Chemnitz, Reichenhainer Straße 31/33, 09126 Chemnitz, Germany
  • Nadine Buschner Department of Lightweight Structures and Polymer Technology, Technische Universität Chemnitz, Reichenhainer Straße 31/33, 09126 Chemnitz, Germany
  • Carola Mende Department of Lightweight Structures and Polymer Technology, Technische Universität Chemnitz, Reichenhainer Straße 31/33, 09126 Chemnitz, Germany
  • Sven Mauersberger Department of Conveyer Technology and Polymers, Technische Universität Chemnitz, Reichenhainer Straße 70, 09126 Chemnitz, Germany
  • Jürgen Tröltzsch Department of Lightweight Structures and Polymer Technology, Technische Universität Chemnitz, Reichenhainer Straße 31/33, 09126 Chemnitz, Germany
  • Sebastian Nendel Cetex Institute of Textile- and Processing Machines non-profit GmbH, Altchemnitzer Straße 11, 09120 Chemnitz, Germany
  • Wolfgang Nendel Department of Lightweight Structures and Polymer Technology, Technische Universität Chemnitz, Reichenhainer Straße 31/33, 09126 Chemnitz, Germany
  • Lothar Kroll Department of Lightweight Structures and Polymer Technology, Technische Universität Chemnitz, Reichenhainer Straße 31/33, 09126 Chemnitz, Germany
  • Michael Gehde Department of Conveyer Technology and Polymers, Technische Universität Chemnitz, Reichenhainer Straße 70, 09126 Chemnitz, Germany

DOI:

https://doi.org/10.21935/tls.v1i2.81

Abstract

For several years, thermoplastic hybrid laminates form a new class in the field of material compounds. These laminates consist of fibre-reinforced plastic prepregs and metal layers in alternating order. Compared to conventional thermosetting multilayer composites, these laminates are suitable for large-scale production and can be manufactured with significantly reduced cycle times in the thermoforming process.  

In the framework of this contribution, the influence of the cooling rate of carbon fibre-reinforced thermoplastic composites and hybrid laminates was investigated with regard to crystallinity and the resulting mechanical properties. Polyamide 6 and thermoplastic polyurethane as matrix systems were examined, in particular.

Additionally, the differential scanning calorimetry was used in order to investigate the influence of the cooling rate on the crystallisation behaviour. It could be determined that the cooling rate has a limited influence on the crystallisation of polyamide 6 and this influences the mechanical properties. Furthermore, a reliance of process parameters on the characteristics profile of composite materials and material compounds with thermoplastic polyurethane could be identified. Depending on process conditions, tensile, bending, and interlaminar shear properties fluctuate up to 20 % in fibre-reinforced laminates and up to 32 % in hybrid laminates. Moderate to fast cooling rates result in optimum mechanical characteristics of tensile properties in fibre-plastic-compounds. Fast to very fast cooling rates are advisable for bending and interlaminar shear properties. Highest tensile and bending characteristics are achieved in hybrid laminates by using fast to very fast cooling rates, while interlaminar shear properties tend to be highest in slow to moderate cooling rates.

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Published

2018-02-15