Session: 17-01-01: Research Posters

Paper Number: 150146

150146 - Impact of Infill Density and Raster Angle on 3d Printed Petg Mechanical Properties 

Fused deposition modeling (FDM) is one of the additive manufacturing processes gaining ground in today's industry.  FDM or 3D printing can create parts with intricate shapes and designs at lower cost and faster than other processes. Despite its advantages, the inability to predict failure and the variability of the mechanical properties of parts manufactured through this process is still a source of difficulty. There are different parameters to consider when 3D printing a part. These parameters include printing orientation, printing speed, printing temperature, raster angle, infill density, infill pattern, nozzle diameter, layer thickness, and overlap ratio. Having a good grasp and understanding of how different parameters affect the anisotropy and mechanical properties of the 3D printed part would be advantageous for FDM when compared to the traditional manufacturing process. This study aims to look at the influence of the infill density and raster angle on Polystyrene Terephthalate Glycol (PETG) specimens when subjected to tensile stress. Infill density can be defined as the amount of material inside the part, and raster angle is the angle at which the layers of the part are printed. The specimens were printed at 5%, 25%, 50%, 75%, and 100% infill density. The raster angle used was set at 0°-90°, 30°-60°, and 45°-45°. The specimens were printed using the Ender 3 printer with a 0.3 mm nozzle diameter, 35 mm/s initial layer speed, 50 mm/s infill speed, 230 °C nozzle temperature, and 60 °C bed temperature. The tensile test used for the experiment is an 800 Series Universal Tensile Tester from TEST RESOURCE with a 4.5 in grip length and 0.2 in/min pull speed. The filament was obtained from MatterHacker Inc.  All samples were modeled and printed in accordance with the ASTM D638-22 standard. There were ten samples printed for each combination, making 70 specimens tested. After the experiment was completed, the team observed an increase in Young's modulus as the infill density increased when the raster angle was at 0-90°. When the raster angle was at 45-45, the 25% infill density had an average Young's modulus of 158570 Psi, which was higher than the 5%, 50%, and 75 %, which had 112770 Psi, 158080 Psi, and 145940 respectively. However, when the raster angle was set at 30-60, it was once again observed that Young's modulus increased as the infill density increased. This was proven to be true as the 100% infill had Young's modulus of 182610 Psi, and it decreased to 162580 Psi, 131640 Psi, 128450 Psi, and 113560 Psi for the 75%, 50 %, 25%, and 5% respectively. For similar infill density, the highest Young's modulus was perceived when the raster angle was set at 0-90 for 100% and 75% infill, 45-45 for 50% and 25% infill, and at 30-60 for 5% infill density. These experimental results will be compared to the finite element analysis for a better understanding of the impact of the raster angle and infill density on PETG parts when manufactured using the FDM process.

Presenting Author: Mechack Nduwa Kennesaw State University

Presenting Author Biography: My name is Mechack Nduwa, I have a Bachelor of Science degree from Kennesaw State University in Mechanical Engineering Technology with a concentration in Manufacturing Engineering. I will be starting my doctorate program at Kennesaw State University this Fall 2024 in Interdisciplinary Engineering with a concentration in Innovative Materials. I have a deep interest in the field of additive manufacturing and my goal is to deepen my knowledge in this area through my research.

Authors:

Mechack Nduwa Kennesaw State University
Aaron Adams Kennesaw State University
Edgar Bryant Kennesaw State University
David Stollberg Kennesaw State University
Cameron Coates Kennesaw State University