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The paper describes the influence provided by the humidity on the mechanical and failure properties of 3D printed composites made by continuous flax fibres reinforcing a poly-lactic acid matrix. The bulk in-plane shear, transverse and longitudinal samples considered here have 28-31% fibre volume fraction and 3-6% porosity. The longitudinal and transverse elastic moduli of the composites, together with their transverse and shear strengths show an almost exponential decay with the increase of the moisture content. The longitudinal strength remains however constant over the range of relative humidity considered in this work. A fractographic inspection shows that the exposure of the 3D printed composites to large relative humidity values facilitates the interlaminar fracture. The influence of the 3D printing process on the fracture and the mechanical properties is also described. Moreover, the paper provides a comprehensive benchmark of the properties of our 3D printed composites against analogous data from open literature
Original languageEnglish
Article number106805
Number of pages12
JournalComposites Part A: Applied Science and Manufacturing
Early online date15 Jan 2022
Publication statusPublished - 1 Apr 2022

Bibliographical note

Funding Information:
The author would like to thank the UK Defence Science and Technology Laboratory for the funding received for this project through the UK-France Ph.D. Scheme. Grant ID: DSTLX-1000141168

Publisher Copyright:
© 2022 Elsevier Ltd


  • A. Bio-composites D. Mechanical testing D. Moisture E. 3D printing


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