In the recently published ‘Infill pattern and density effects on the tensile properties of 3D printed PLA material,’ researchers from Indonesia delve further into the details of fabrication with polylactic acid (PLA) material, working with three different infill densities and patterns.
While both acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA) are commonly used in 3D printing, for this study the researchers focused on PLA—often chosen due to affordability, accessibility, and potential for producing innovative, lightweight prototypes and parts. Not only that, because of its plant-based nature, PLA is biodegradable and more environmentally friendly.
Mainly investigating infill density and infill pattern, the research team used tensile tests to reveal material properties, varying parameters to test properties such as tensile strength, yield strength, and ultimate strength.
The following infill densities were chosen:
- 25 percent
- 50 percent
- 75 percent
Three infill patterns were used:
Five samples were used per each combination, resulting in 45 specimens overall. The researchers used 1.75mm PLA, printing melting temperatures of approximately 190°C – 230°C. For 3D printing specimens, the research team used a temperature setting of 210°C.
Infill patterns were printed as follows:
- Grid pattern printing object layers in 90-degree crossing paths
- Tri-hexagonal patterns printing object layers in three path directions, each varying by 120 degrees of the other
- Lowest path angle (in terms of specimen axial axis) of 30 degrees
- Concentric pattern printing in direction of specimen axial axis
Overall, the study showed that as tensile properties increase, the infill density increases—with the exclusion of the concentric pattern at 75 percent infill density.
“Based on the result, the highest tensile properties corresponded to concentric pattern with 75% of infill density, where it has 42.2 MPa of ultimate strength, 3.89 GPa of Young’s modulus, and 40.98 MPa of yield strength. In addition, grid pattern with 100% infill density was tested and it was recorded that the Young’s modulus and yield strength were 3.6 GPa and 48.2 MPa, respectively. For 100% infill density, the effect of infill pattern on mechanical properties is negligible,” concluded the researchers.
“The results can be used as reference data for creating finite element model (FEM) and predicting the optimum tensile properties with respect to the selection of the printing parameters. Comprehensive investigation on the effect of infill pattern on the tensile properties is suggested for future study.”
What do you think of this news? Let us know your thoughts! Join the discussion of this and other 3D printing topics at 3DPrintBoard.com.[Source / Images: ‘Infill pattern and density effects on the tensile properties of 3D printed PLA material’]
You May Also Like
3D Printing News Briefs, August 25, 2021: Software Beta, Self-Replicating Printer, & More
We’re starting with materials in today’s 3D Printing News Briefs, as XJet as announced the commercial availability of alumina ceramic. Moving on, Raise3D has announced the ideaMaker 4.2.0 beta, and...
Facility for Mass Roll-to-Roll 3D Printing to Be Opened by MIT Spinout
Massachusetts manufacturing startup OPT Industries uses automation engineering, computational design, and materials science to develop and manufacture customizable functional materials for 3D printing. The MIT spinout company became well-known for its...
3D Printed Sensor Created by Fraunhofer and ARBURG
One of the many Holy Grails of 3D printing is the ability to 3D print fully functional items in a single build process. Companies like Inkbit and Sakuu are after...
Inkbit Raises $30M in Series B Funding, Plans to Expand Production of 3D Printing System
MIT spinout Inkbit has raised $30 million in a Series B funding round led by venture capital firm Phoenix Venture Partners (PVP). The company intends to use the funds to...
View our broad assortment of in house and third party products.