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Discussion on microscale geometry dominating strength - author version.pdf (596.6 kB)

Discussion on the microscale geometry as the dominant factor for strength anisotropy in material extrusion additive manufacturing

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journal contribution
posted on 2021-11-11, 10:10 authored by James Allum, Amirpasha Moetazedian, Andy GleadallAndy Gleadall, Vadim SilberschmidtVadim Silberschmidt
This paper presents a discussion and interpretation of the findings in the review paper “Fused filament fabrication of polymer materials: A review of interlayer bond” by Xia Gao, Shunxin Qi, Xiao Kuang, Yunlan Su, Jing Li, Dujin Wang [Additive Manufacturing (2020): 101658]. This discussion draws different conclusions based on the microscale filament geometry of interlayer bonds as opposed to molecular-scale bonding (diffusion and entanglement of polymer chains), which is predominantly considered in the review. Four complementary arguments on the matter are proposed, demonstrating that microscale geometry rather than incomplete molecular bonding is the predominant cause of strength anisotropy in material extrusion additive manufacturing (MEAM). These arguments consider the evidence from studies that (i) factored microscale geometry into strength calculation; (ii) eliminated the influence of geometry; (iii) improved the geometry to reduce its impact on strength, and (iv) tested the effect of manually reproduced interlayer geometry in bulk material. Overall, this discussion suggests that the underlying cause of anisotropy in MEAM is filament-scale geometric features (grooves and voids between layers), not the deficient bonding as is often theorised. Drawing upon the evidence in the literature, this discussion proposes that specimens attain bulk material strength for a range of printing conditions and materials.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Additive Manufacturing

Volume

48

Issue

Part A

Publisher

Elsevier

Version

  • AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Additive Manufacturing and the definitive published version is available at https://doi.org/10.1016/j.addma.2021.102390.

Acceptance date

2021-10-04

Publication date

2021-10-13

Copyright date

2021

ISSN

2214-8604

eISSN

2214-7810

Language

  • en

Depositor

Dr Andy Gleadall. Deposit date: 11 November 2021

Article number

102390

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