Caracterização da resistência mecânica de peças em PLA obtidas por técnicas de manufatura aditiva

Abstract

In view of the growing popularity of 3D printers and the wide variety of parameters available for printing, this work seeks to establish a study envelope based on the most used printing parameters in the domestic environment, such as printing speed, nozzle used, temperature used and fixed filament brand for the manufacture of all test specimens used in the tests. Based on this premise, the present work analyzes the influence of filling density on the mechanical resistance of PLA used in 3D printing, by surveying stress x strain curves and obtaining absolute values of tensile and flexural strength. For this, simple tensile and 3-point bending tests were carried out, following the procedures listed in ASTM D638 and ASTM D790. The filling density level studied was varied from 10% to 100%, a range that was varied in increments of 10% in the density value. To verify the influence of filling on the final strength of the part, the Scott Knott test was applied, followed by the Scott Knott test, where it was possible to establish a relationship between the mechanical resistance and the level of filling, separating the different filling densities into equivalent groups of resistance.