Purpose

This study aims to investigate the relationship between part porosity and mechanical properties of short-fibre reinforced polylactic acid printed via multi-axis material extrusion (MAMEX) to establish guidelines for optimal process configurations.

Design/methodology/approach

Material properties graphs provide the basis for studying the relationship between porosity and mechanical behaviour. Using the correlations found in this study, the way to improve printing strategies and filament properties can be deducted directly from an analysis of the print path and the final influence on mechanical performance.

Findings

Some commercial brands of short-fibre reinforced filament present inherent porosity that weakens the mechanical behaviour of MAMEX components.

Originality/value

Low-cost MAMEX allows the production of components that do not present anisotropic behaviour and are mechanically optimised through the alignment of the filaments along with internal stresses. This paper also addresses the effects of multi-axis deposition strategies on the resulting porosity and proposes improvements to reduce residual porosity, thus increasing the mechanical performance in the future.

中文翻译：

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短纤维复合材料多轴材料挤压中的孔隙率

目的

这项研究旨在研究通过多轴材料挤出（MAMEX）印刷的短纤维增强聚乳酸的零件孔隙率与机械性能之间的关系，以建立最佳工艺配置的准则。

设计/方法/方法

材料特性图为研究孔隙率与机械性能之间的关系提供了基础。使用本研究中发现的相关性，可以直接从对打印路径的分析以及对机械性能的最终影响中推论出改善打印策略和细丝特性的方法。

发现

一些商业品牌的短纤维增强长丝具有固有的孔隙度，从而削弱了MAMEX组件的机械性能。

创意/价值

低成本的MAMEX可以生产出不具有各向异性特性的部件，并通过将细丝与内应力对齐来进行机械优化。本文还讨论了多轴沉积策略对最终孔隙率的影响，并提出了减少残留孔隙率的改进措施，从而提高了未来的机械性能。