Material modelling of FDM printed PLA part

Oleg Volgin, Igor Shishkovsky

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This paper focuses on modelling inelasticity of additively manufactured polylactide (PLA) thermoplastic using Fused Deposition Modelling (FDM) printing technology. The material response of PLA is viscoplastic and temperature-dependent, as is typically seen for thermoplastics. The inelastic deformation of printed PLA undergoes initial yielding, strain softening, and subsequent failure. The Three-Network (TN) constitutive model was employed in this work, which captures experimentally observed material response and consists of three molecular equilibrium and time-dependent viscous networks that act in parallel. The parameter identification was performed in accordance with experimental data from uniaxial testing and a validation experiment was carried out by loading plate with a hole and measuring its strain distribution using Digital Image Correlation (DIC) method, which was compared with the predictions from Finite Element Analysis (FEA).

Original languageEnglish
Pages (from-to)153-160
Number of pages8
JournalEngineering Solid Mechanics
Issue number2
Publication statusPublished - 2021


  • Constitutive model
  • Material testing
  • Viscoplasticity


Dive into the research topics of 'Material modelling of FDM printed PLA part'. Together they form a unique fingerprint.

Cite this