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Fracture of 3D-printed polymers: Crucial role of filament-scale geometric features

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journal contribution
posted on 2020-01-22, 09:42 authored by James Allum, Andy GleadallAndy Gleadall, Vadim SilberschmidtVadim Silberschmidt
Is mechanical anisotropy in extrusion-based 3D-printed parts caused by weak inter-filament bonding, as is widely accepted? This study demonstrates that filament-scale geometric features may be a more important factor than filament bonding. Specially designed 3D-printed compact tension specimens were tested normal to, and along, the direction of extruded filaments. Higher strength and toughness were found in the filament direction. These differences disappeared when small grooves, comparable to micro-features, were introduced in specimens tested along the former direction to replicate grooves that naturally occur between filaments/layers. Mechanical testing and fractography demonstrate that filament-scale geometric stress raisers are critically important and cause anisotropy in 3D-printed materials.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Engineering Fracture Mechanics

Volume

224

Publisher

Elsevier

Version

  • AM (Accepted Manuscript)

Rights holder

© Elsevier Ltd

Publisher statement

This paper was accepted for publication in the journal Engineering Fracture Mechanics and the definitive published version is available at https://doi.org/10.1016/j.engfracmech.2019.106818.

Acceptance date

2019-12-14

Publication date

2019-12-20

Copyright date

2019

ISSN

0013-7944

Language

  • en

Depositor

Mr Andy Gleadall. Deposit date: 17 January 2020

Article number

106818

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