Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
EXTRUSION-BASED 3D PRINTING: COLOR INFLUENCE ON MECHANICAL PROPERTIES OF PLA PARTS
Submission Author:
Francisco Castro , Aveiro , Portugal
Co-Authors:
Francisco Castro, Leonardo Santana, Jorge Lino Alves
Presenter: Francisco Castro
doi://10.26678/ABCM.COBEM2021.COB2021-1406
Abstract
3D printing material suppliers in general provide scarce information about materials properties or on how the inclusion of different types of pigments can affect the quality standard of printed parts. In this study we evaluate the influence of color on the mechanical properties in PLA (Poly lactic acid) parts. For each filament color (blue, white, orange and red), two sets of samples were printed for three-point flexural tests, taken with original printing conditions and after an annealing treatment (HT). Measurements of the mass of the parts were carried out, in addition to the density and analysis of the molecular composition, through Fourier Transform Infrared Spectroscopy (FTIR), of the filaments. The results showed that the molecular structure of polymers with different colors and its density are similar, thus no conclusion regarding the presence of additives could be made. The color significantly influenced the mechanical responses and mass of the parts with and without heat treatment. Annealing increased the maximum flexural strength in all samples. Parts‘ modulus also slightly increased, indicating that the HT was not adequate to increase crystallization due to the influence of the pigments. Results suggest that color brings unpredictability to the behavior of printed and post treated parts.
Keywords
extrusion, FFF, PLA, color, annealing
