Influência dos parâmetros de impressão 3D na resistência à flexão de corpos de prova impressos em ácido polilático (PLA) utilizando modelagem por fusão e deposição (FDM)

Abstract

3D printing or additive manufacturing (AM), through computer graphics, has streamlined manufacturing processes, allowing rapid prototyping (PR). In this way, it allows and reduced resources. There are numerous AM techniques, Fusion and Deposition Modeling (FDM) which is one of the most used due to its low cost. To produce a prototype it is necessary to select the printing and material parameters. However, there is a lack of information the printing parameters and the mechanical strength of the printed prototypes. The objective of this work is to evaluate the effect of printing parameters on the flexural strength of specimens (PCs) printed in polylactic acid (PLA). For this, the experimental research method was used. PLA was used to produce CPs as per ASTM D 790. Commercial 3D printing was used to produce the CPs. Print parameters such as height between layers, wall thickness and fill density were adjusted to print 81 CPs with 27 different parameter combinations and 3 replicates. To determine the flexural strength, the CPs were tested using a universal testing machine and a 3-point bending test device according to ISO 178:2019. Design of Experiments (DOE), Analysis of Variance (ANOVA) and Response Surface Methodology (RSM) were used to analyze the results. From the results of this study, it is possible to predict the mechanical strength of printed parts on a commercial printer and select the best combination of printing parameters. The results show that the flexural strength is directly related to the printing parameters. It is concluded that the flexural strength increases with increasing fill density, wall thickness and interlayer height.