Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
MECHANICAL PROPERTIES OF POLYLACTIC ACID USED IN COMPONENTS MANUFACTURED IN 3D PRINTING
Submission Author:
Geice Paula Villibor , MG , United States
Co-Authors:
Luíza Albuquerque, Geice Paula Villibor, Pedro Rodrigues, Joseph Kalil Khoury Junior
Presenter: Geice Paula Villibor
doi://10.26678/ABCM.COBEM2023.COB2023-2156
Abstract
The use of low-cost 3D printer materials including polylactic acid (PLA), acrylonitrile butadiene styrene (ABS) and Polyethylene Terephthalate – Glycol (PET-G) has been increasingly used in several applications. 3D printing techniques can be used for mechanical components design of vehicle like drones, underwater rovers and, in another way, for created face shield prototypes used in the pandemic of COVID-19. In all these applications, knowledge of their mechanical properties is of great importance for more reliable, safe and durable designs. The mechanical properties of the materials used in 3D printers, in most cases, have incomplete information passed on by their manufacturers and in some cases, they are not available. The objective of this work was to study the influence of printing parameters on the mechanical properties of components made of polylactic acid (PLA). The printer used was the Ender brand, model 3. The dimensions of the specimen were defined based on ASTM D638. The printing parameters studied were two fill percentages (50 and 80%) and two printing speeds of the extruder nozzle (30 and 50 mm/s). Five repetitions were performed for each treatment, totaling 20 specimens. Tensile tests were performed using an Instrom® test machine, model 3365, with a maximum capacity of 5 kN. The entire test procedure was made following the ASTM D638 standard, in which the displacement speed was 5 mm/min. The parameters determined during the test were modulus of elasticity and tensile strength. The significant influence of the interaction between impression speed and percentage of filler on the determined modulus of elasticity was verified. For tensile strength the parameters impression speed and percentage of filler influenced individually. The general average value found for the modulus of elasticity was 847.43 MPa and for the tensile strength was 35.95 MPa. The values obtained corroborate those determined by other authors in tests using the same material printed on different printers. Thus, by knowing the mechanical properties of PLA in 3D printing it is possible to design components with reduced mass, reliable and with greater durability.
Keywords
printing parameters, ASTM D638, Modulus of elasticity, Tensile strength
