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J. Compos. Sci. 2018, 2(2), 20; https://doi.org/10.3390/jcs2020020

Fibre Length Reduction in Natural Fibre-Reinforced Polymers during Compounding and Injection Moulding—Experiments Versus Numerical Prediction of Fibre Breakage

1
Hochschule Bremen—City University of Applied Sciences Bremen, Biomimetics—The Biological Materials Group, Neustadtswall 30, 28199 Bremen, Germany
2
Polymer Engineering Center (PEC), University of Wisconsin-Madison, 1513 University Avenue, Madison, WI 53706, USA
3
M-Base Engineering + Software GmbH, Dennewartstr. 27, 52068 Aachen, Germany
4
VKT Video Kommunikation GmbH, Sandwiesenstr. 15, 72793 Pfullingen, Germany
5
Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstrasse 9, 91058 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Received: 22 February 2018 / Revised: 23 March 2018 / Accepted: 26 March 2018 / Published: 28 March 2018
(This article belongs to the Special Issue Discontinuous Fiber Composites)
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Abstract

To establish injection-moulded, natural fibre-reinforced polymers in the automotive industry, numerical simulations are important. To include the breakage behaviour of natural fibres in simulations, a profound understanding is necessary. In this study, the length and width reduction of flax and sisal fibre bundles were analysed experimentally during compounding and injection moulding. Further an optical analysis of the fibre breakage behaviour was performed via scanning electron microscopy and during fibre tensile testing with an ultra-high-speed camera. The fibre breakage of flax and sisal during injection moulding was modelled using a micromechanical model. The experimental and simulative results consistently show that during injection moulding the fibre length is not reduced further; the fibre length was already significantly reduced during compounding. For the mechanical properties of a fibre-reinforced composite it is important to overachieve the critical fibre length in the injection moulded component. The micromechanical model could be used to predict the necessary fibre length in the granules. View Full-Text
Keywords: natural fibres; injection moulding; fibre morphology; fibre-reinforced polymers natural fibres; injection moulding; fibre morphology; fibre-reinforced polymers
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Albrecht, K.; Osswald, T.; Baur, E.; Meier, T.; Wartzack, S.; Müssig, J. Fibre Length Reduction in Natural Fibre-Reinforced Polymers during Compounding and Injection Moulding—Experiments Versus Numerical Prediction of Fibre Breakage. J. Compos. Sci. 2018, 2, 20.

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