Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EFFECT OF INFILL AND NUMBER OF PARTS PER CYCLE ON MECHANICAL PROPERTIES OF EXTRUDED PLA BY ADDITIVE MANUFACTURING
Submission Author:
Igor Cesar de Carlos Rosa , MG
Co-Authors:
Igor Cesar de Carlos Rosa, Giannini Barcelllos de Oliveira, Arthur Alves Fiocchi, Diego Augusto Costa Alves, Alexandre Zuquete Guarato, Núbia dos Santos Saad
Presenter: Giannini Barcelllos de Oliveira
doi://10.26678/ABCM.COBEM2019.COB2019-1976
Abstract
The dissemination of low-cost machines and the lack of standardized information and scientific approach can result in less reliable parts produced by the additive manufacturing (AM) process. The correct selection of process variables also influence the mechanical properties of the workpiece produced. Thus, understanding the effect of input variables is critical. The deposition of material layer by layer, popularly known as 3D printing, is then a vast field for scientific investigations. The present work aims to determine the mechanical properties of the PLA thermoplastic by means of three-point bending tests. The AM input parameters investigated were (a) percentage (P = 0 %, 10 %, 20 %, 30%) of the hexagonal (H) infill of the parts and (b) number of printed parts per manufacturing cycle (2 and 3). The results show that increasing the percentage of infill improves the mechanical properties. The manufacture of more than one part per AM cycle modifies the mechanical properties. Among the groups studied the ultimate flexural strength (UFS) increased for the smaller groups. Future specific technical standards for mechanical testing must take into account geometry and cross-sectional area of parts with infill percentage of less than 100 % as well as the number of extruded parts by AM.
Keywords
Additive manufacturing, 3D printing, Infill Percentage, Pieces per cycle, three-point bending test
