Tribology and Materials | Volume 1 | Issue 2 | 2022 | 70-80
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https://doi.org/10.46793/tribomat.2022.009
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Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology
Miloš Vorkapić
1,
Ivana Mladenović1,
Marija Pergal1,
Toni Ivanov2,
Marija Baltić2
1 University of Belgrade,
Institute of Chemistry, Technology and Metallurgy, Belgrade, Serbia
2 University of Belgrade, Faculty of Mechanical Engineering,
Belgrade, Serbia
Abstract: Three-dimensional printed plastic products developed
through fused deposition modelling (FDM) take long-term mechanical
loading in most industrial prototypes. This article focuses on the
impact of the 3D printing parameters, type of thermal treatment and
variation of characteristic dimensions of standard specimens on the
tensile properties of poly(lactic acid) (PLA) material. Two mediums were
used for thermal treatment: NaCl powder and plaster. The specimens
immersed in NaCl powder were heated to the melting temperature of the
filament (200 °C), while the processing of the plastered specimens was
performed at a temperature of 100 °C. After treatment, the specimens
were cooled at room temperature (25 °C), and the dimensions of the
annealed and untreated specimens were controlled. The tensile test of
the specimens was performed on the universal test machine. The response
surface methodology (RSM) is employed to predict the tensile stress by
undertaking input parameters. The analysis of variance (ANOVA) results
revealed that the untreated specimens, orientation –45/45 and layer
thickness of 0.1 mm had the highest tensile stress value. Thermal
treatment in plaster showed a significant increase in tensile strength,
while the best specimens were obtained after treatment in NaCl, and all
refer to the –45/45 (0.1 mm) orientation.
Keywords:
additive manufacturing, fused deposition modelling, PLA, thermoplastic
polymer, tensile testing, optimisation.
Received: 22-05-2022, Revised: 05-06-2022, Accepted: 09-06-2022
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license, which allows users to distribute, remix, adapt,
and build upon the material in any medium or format for non-commercial purposes only, and only so long as attribution is given to the creator.
2 University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia
Abstract: Three-dimensional printed plastic products developed through fused deposition modelling (FDM) take long-term mechanical loading in most industrial prototypes. This article focuses on the impact of the 3D printing parameters, type of thermal treatment and variation of characteristic dimensions of standard specimens on the tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl powder were heated to the melting temperature of the filament (200 °C), while the processing of the plastered specimens was performed at a temperature of 100 °C. After treatment, the specimens were cooled at room temperature (25 °C), and the dimensions of the annealed and untreated specimens were controlled. The tensile test of the specimens was performed on the universal test machine. The response surface methodology (RSM) is employed to predict the tensile stress by undertaking input parameters. The analysis of variance (ANOVA) results revealed that the untreated specimens, orientation –45/45 and layer thickness of 0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed a significant increase in tensile strength, while the best specimens were obtained after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.
Keywords: additive manufacturing, fused deposition modelling, PLA, thermoplastic polymer, tensile testing, optimisation.
Received: 22-05-2022, Revised: 05-06-2022, Accepted: 09-06-2022
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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license, which allows users to distribute, remix, adapt, and build upon the material in any medium or format for non-commercial purposes only, and only so long as attribution is given to the creator.