Análise experimental de amostras produzidas por manufatura aditiva em PLA através de ensaio de tração

Abstract

This research presents an evaluation of anisotropic behaviour on 3D printed samples by Fused Deposition Modelling (FDM), with Polylactic Acid (PLA) filaments. The goal of this study was to quantify the mechanical resistance of the samples and to point out which are the best printing conditions. A literature review about current 3D printing methods, their applications, their advantages, material properties, traction tests and how to perform them was developed. Parameters about technical standards for traction tests on polymers were studied: the sample geometry, the number of necessary samples and 3D printing conditions. Five samples were manufactured on horizontal orientation (0°) and five on the vertical orientation (90°) in relation to the printing bed. This work concludes that there is a large advantage of the samples printed on the horizontal way over the samples that were printed on the vertical orientation. The experimental results were compared with the previous on the literature. There is a difference up to 20% on the experimental results of this work in relation to previous works on the literature. Moreover, the anisotropic behaviour the printed samples is similar as composite materials. Some tensile limits obtained in the present work are greater than the manufacturer information for the used filaments. Future research will still focus on mechanical properties of 3D printed samples in relation to different printing parameters and to different filament materials.