FEMS EUROMAT 2023
Lecture
06.09.2023
Investigations on the mechanical property robustness of natural fibre reinforced polymer composites (NFRPC) under varying processing conditions
AK

Andreas Krämer

Leibniz-Institut für Verbundwerkstoffe GmbH

Krämer, A. (Speaker)¹; Broening, J.²; Mitschang, P.¹
¹Leibniz-Institut für Verbundwerkstoffe GmbH, Kaiserslautern; ²Institut für Textiltechnik der RWTH Aachen
Vorschau
Untertitel (CC)

With a neutral CO2 balance and low energy consumption during processing into composites, natural fibres are able to make an important contribution to achieving emission limits. At the same time, natural fibres have a low density, which makes them very suitable as a reinforcing structure for fibre reinforced polymer composites (FRPC). In automotive applications, the advantages of natural fibres - such as good damping properties and a low tendency to splinter in crashes - have already been used for several years. Hybrid nonwovens for the production of semi-structural components like roof stiffeners and door panels are established. Based on a natural fibre and polymer blend, the nonwovens are produced either by carding or airlaying - both with a subsequent needling step. The processing of nonwovens on an industrial scale usually takes place in two stages. First, the material is compacted and heated above the melting temperature of the polymer in a pressing unit followed by a moulding step of the hot NFRPC in a second pressing unit. For this, it is important to understand the influences of the process variables on the finished part in order to ensure that processing is as simple and robust as possible. In this work, the extent to which the mechanical properties of NFRPC nonwovens vary depending on the selected moulding parameters was investigated in an industry-related process. For the investigations, hybrid nonwovens -each consisting of 50 wt. % polypropylene (PP), 25 wt. % flax and 25 wt. %. hemp with an area weight of 1,200 – 1,300 g/m² from two manufacturers - were used. To evaluate the influence of processing, the parameters heating temperature, pre-compaction during heating, consolidation temperature and consolidation pressure were varied. The influence of the parameters was subsequently measured and evaluated by means of tensile, bending and impact tests.

Abstract

Abstract

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