Anisotropic mechanical property variance between ASTM D638-14 type i and type iv fused filament fabricated specimens

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-07-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
294-301
Series
Polymer Testing, Volume 68
Abstract
The open source introduction of fused filament fabrication (FFF) enables distributed manufacturing of consumer products. However, with a wide range of low-cost FFF 3-D printers and settings possible, there is a lack of information on the variability in printed mechanical properties. This paper utilizes a large pool of 47 user-assembled 3-D printers to quantify the mechanical property variations of ultimate tensile strength (UTS) and yield strength of FFF printed components using ASTM D638-14 horizontally-oriented Type I and IV geometries for poly lactic acid (PLA). The results indicate that utilizing Type IV tensile test piece geometry may overestimate the UTS relative to the Type I. Furthermore, anisotropic mechanical property variances were quantified for Type IV specimens (vertical and horizontal orientations). Vertical tensile specimens had an ultimate tensile strength 47.9% less than horizontal. Finally, the abundant supply of PLA 3-D prints suggest open-source printers assembled by individual operators can produce quality plastic components although the mechanical performance of the given part can vary dramatically based on the operator selection of printing parameters that provide a visually acceptable part.
Description
Keywords
3D printing, FDM, Fused filament fabrication, Mechanical testing, Polylactic acid, RepRap
Other note
Citation
Laureto , J J & Pearce , J M 2018 , ' Anisotropic mechanical property variance between ASTM D638-14 type i and type iv fused filament fabricated specimens ' , Polymer Testing , vol. 68 , pp. 294-301 . https://doi.org/10.1016/j.polymertesting.2018.04.029