Evaluation of the Infill Design on the Tensile Response of 3D Printed Polylactic Acid Polymer

Evaluation of the Infill Design on the Tensile Response of 3D Printed Polylactic Acid Polymer

The current study explores the effects of geometrical shapes of the infills on the 3D printed polylactic acid (PLA) plastic on the tensile properties. For this purpose, by utilizing an accessible supply desktop printer, specimens of diamond, rectangular, and hexagonal infill patterns were produced u...

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Bibliographic Details
Published in:Materials Vol. 14; no. 9; p. 2195
Main Authors: Harpool, Tanner David, Alarifi, Ibrahim Mohammed, Alshammari, Basheer A, Aabid, Abdul, Baig, Muneer, Malik, Rizwan Ahmed, Mohamed Sayed, Ahmed, Asmatulu, Ramazan, El-Bagory, Tarek Mohamed Ahmed Ali
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 25-04-2021
MDPI
Subjects:
3-D printers
3D printing
Additive manufacturing
Adhesive bonding
Brittleness
construct stress
Design
Diamonds
Elongation
finite element analysis
Finite element method
Fused deposition modeling
fused filament fabrication (FFF)
Impact strength
Industrial applications
infill shapes
Influence
Interfacial bonding
Investigations
Mechanical properties
Polyethylene terephthalate
Polylactic acid
strain diagrams
Substrates
Tensile properties
Tensile stress
Tensile tests
Three dimensional printing
Wood composites
Yield stress
infill shapes
construct stress
finite element analysis
strain diagrams
3D printing
fused filament fabrication (FFF)
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Summary:The current study explores the effects of geometrical shapes of the infills on the 3D printed polylactic acid (PLA) plastic on the tensile properties. For this purpose, by utilizing an accessible supply desktop printer, specimens of diamond, rectangular, and hexagonal infill patterns were produced using the fused filament fabrication (FFF) 3D printing technique. Additionally, solid samples were printed for comparison. The printed tensile test specimens were conducted at environmental temperature, Ta of 23 °C and crosshead speed, V of 5 mm/min. Mainly, this study focuses on investigating the percentage infill with respect to the cross-sectional area of the investigated samples. The mechanical properties, i.e., modulus of toughness, ultimate tensile stress, yield stress, and percent elongation, were explored for each sample having a different geometrical infill design. The test outcomes for each pattern were systematically compared. To further validate the experimental results, a computer simulation using finite element analysis was also performed and contrasted with the experimental tensile tests. The experimental results mainly suggested a brittle behavior for solidly infilled specimen, while rectangular, diamond, and hexagonal infill patterns showed ductile-like behavior (fine size and texture of infills). This brittleness may be due to the relatively higher infill density results that led to the high bonding adhesion of the printed layers, and the size and thickness effects of the solid substrate. It made the solidly infilled specimen structure denser and brittle. Among all structures, hexagon geometrical infill showed relative improvement in the mechanical properties (highest ultimate tensile stress and modulus values 1759.4 MPa and 57.74 MPa, respectively) compared with other geometrical infills. Therefore, the geometrical infill effects play an important role in selecting the suitable mechanical property's values in industrial applications.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma14092195