EXPERIMENTAL INVESTIGATION AND MODELLING OF THE MORPHOLOGY AND INDUCED THERMAL PROPERTIES EVOLUTION BY CONSOLIDATION OF FLAX FIBRES REINFORCED THERMOPLASTIC COMPOSITE

Authors

Perrin H., Lucas M., Senoussaoui N.L., Koutsawa Y.

Reference

ECCM 2022 - Proceedings of the 20th European Conference on Composite Materials: Composites Meet Sustainability, vol. 1, pp. 1526-1535, 2022

Description

This study is focused on the understanding of the morphology evolution and associated thermal properties during consolidation of unidirectional and hybrid lay-up enabling the prediction of consolidation behavior under non-isothermal conditions. The literature presents a significant number of studies, describing the thermal conductivity measurement and prediction for a defined material configuration. Authors propose in this paper an original approach, based on the experimental characterization of the thermal and compression behaviors as function of the compression rate, their numerical modelling enabling the consolidation process simulation in non-isothermal environment. First, an experimental morphology analysis during consolidation was performed, based on an interrupted consolidation method. Thermal conductivity measurements were performed, using a Hot disk method, to quantify this evolution as function of the consolidation rate. A theoretical model, based on a two-level homogenization method, and a Mori-Tanaka model is proposed, considering the three-phases material, and correlate with experiments with a good agreement, but limited predictivity for porosity level above 15%.