ABSTRACT

The additive manufacturing technique has been used more and more recently because of the advantages it offers, in particular in terms of the geometrical complexity of the produced parts. Recently, researchers are increasingly interested in flax fibres as a natural reinforcing for polymer-based filaments manufactured via the Fused Filament Fabrication (FFF) method, allowing their mechanical properties to be improved compared to the pure polymer. The mechanical properties of flax fibre-reinforced polylactic acid composite, obtained by the FFF process, are nevertheless not well known. The purpose of this study is to characterise the effect of manufacturing conditions as feed rate, build orientations, and layer thickness on the mechanical performance of PLA/Flax fibre composite. The mechanical characteristics of the materials were explored at the part scale considered as macroscopic scale and at the filament scale considered as mesoscopic scale. Microstructural analyses are performed to reveal the rupture mechanism at the microscopic scale.

摘要

增材制造技术最近被越来越多地使用，因为它具有优势，特别是在所生产零件的几何复杂性方面。最近，研究人员对亚麻纤维越来越感兴趣，因为它可以作为通过熔融长丝制造 (FFF) 方法制造的聚合物基长丝的天然增强材料，与纯聚合物相比，它们的机械性能得到改善。然而，通过 FFF 工艺获得的亚麻纤维增强聚乳酸复合材料的机械性能尚不为人所知。本研究的目的是描述制造条件对 PLA/亚麻纤维复合材料的机械性能的影响，如进料速率、构建方向和层厚度。在被认为是宏观尺度的零件尺度和被认为是细观尺度的细丝尺度上探索了材料的机械特性。进行微观结构分析以揭示微观尺度的破裂机制。