An experimental methodology to analyse the structural behaviour of FDM parts with variable process parameters

Steffany Cerda-Avila, Hugo I. Medellin-Castillo, Theodore Lim

Research output: Contribution to journalArticle

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Abstract

Purpose
This paper aims to investigate the structural behaviour of polylactic acid (PLA) parts fabricated by fused deposition modelling (FDM) to support the development of analytical and numerical models to predict the structural performance of FDM components and categories of similar additive manufactured parts.

Design/methodology/approach
A new methodology based on uniaxial tensile tests of filaments and FDM specimens, infill measurement and normalization of the results is proposed and implemented. A total of 396 specimens made of PLA were evaluated by using variable process parameters.

Findings
The infill and the build orientation have a large influence on the elastic modulus and ultimate tensile stress, whereas the layer thickness and the infill pattern have a low influence on these properties. The elongation at break is not influenced by the process parameters except by the build orientation. Furthermore, the infill values measured on the test specimens differ from the nominal values provided by the system.

Research limitations/implications
The analysis of the structural properties of FDM samples is limited to uniaxial loading conditions.

Practical implications
The obtained results are valuable for the structural analysis and numerical simulation of FDM components and for potential studies using machine learning techniques to predict the structural response of FDM parts.

Originality/value
A new experimental methodology that considers the measurement of the real infill percentage and the normalization of the results for inter-comparison with other studies is proposed. Moreover, a new set of experimental results of FDM-PLA parts is presented and extends the existing results in the literature.
Original languageEnglish
JournalRapid Prototyping Journal
Early online date13 Jul 2020
DOIs
Publication statusE-pub ahead of print - 13 Jul 2020

Keywords

  • Additive Manufacturing (AM)
  • Build orientation
  • Fused Deposition Modelling (FDM)
  • Infill
  • Layer thickness
  • Process parameters
  • Raster angle
  • Structural performance

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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