Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Study of test bodies manufactured through FDM 3D printing of the material PLA
Submission Author:
Igor Gaviano , DF , Brazil
Co-Authors:
Igor Gaviano
Presenter: Igor Gaviano
doi://10.26678/ABCM.COBEM2023.COB2023-0347
Abstract
Additive Manufacturing (AM) -- in particular, 3D Printing -- achieved a high growth in terms of market share in the past two decades and research regarding the engineering problems envolved in the process has become absolutely relevant. One of the greatest challenges present in the 3D printed parts is the anisotropy showed by them and this study aims at adressing the issue via tension tests with test bodies (TBs) printed through Fused Deposition Modeling (FDM) using the material Polylactic Acid (PLA). Three printing patterns (Lines, ZigZag and Concentric) and three printing positions (Flat, On-Edge and Upright) were applied, so that two TBs were manufactured with the combination of each of these characteristics and - with the mean value for the TBs of same configuration - the Force vs. Displacement and Stress vs. Elongation curves were obtained. An a posteriori analysis of the Stress vs. Elongation curves made it possible to estimate the values of the Elasticity Modulus (E), Initial Yield Limit (sigma_E_0), Ultimate Tensile Strenght (sigma_R) and Percentual Elongation at Fracture (A\%_f) for each of the configurations. It was stablished as the best configuration the concentric pattern and flat printing position, because it was the one which achieved the highest tenacity and mechanical strenght (E = 3087 +- 78 MPa, sigma_E_0 = 49,6 +- 1,3 MPa, sigma_R = 57,9 +- 0,4 MPa, A\%_f = 8,8 +- 1,2). A deep fragilization was demonstrated for parts manufactured with the load direction perpendicular to the printing plane (E = 2682 +- 53 MPa, \; \sigma_E_0 = 28,8 +- 1,1 MPa\, sigma_R = 34,4 +- 2,4 MPa, \; A\%_f = 1,5 +- 0,2), so that this condition must be avoided in terms of mechanical design.
Keywords
3D printing, FDM, Tensile Test, Additive manufacturing, plastic, PLA, polylactic acid, Polymers, natural polymer, Elasticity modulus, Yield Strength, Ultimate Tensile Strength, stress-strain curve, elongation
