Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
METHOD FOR CONSIDERING THE REAL AREA MOMENT OF INERTIA IN BENDING TESTS OF EXTRUDED PLA PARTS WITH DIFFERENT INFILL PERCENTAGES
Submission Author:
Igor Cesar de Carlos Rosa , MG
Co-Authors:
Igor Cesar de Carlos Rosa, Giannini Barcelllos de Oliveira, Arthur Alves Fiocchi
Presenter: Igor Cesar de Carlos Rosa
doi://10.26678/ABCM.COBEM2019.COB2019-1950
Abstract
The additive manufacturing (AM) techniques is increasing demand by industry and academia. This is mainly because new lighter and mechanically strength parts cannot be economically manufactured or are difficult to be produced by traditional machining techniques (subtractive manufacturing). The AM has been gaining prominence by combining the fabrication of objects and functional assembled sets of complex macro geometries up until now impossible to be fabricated in a single step by associating different materials and properties. The present work aims to study the mechanical properties of extruded PLA workpieces by means of three-point bending tests and proposes a method for determining the ultimate flexural stress (UFS) considering the workpiece infill percentages (P). The bending tests were adapted from the ASTM D790 standard and considered the real area moment of inertia of the workpieces having different percentage (P = 0 %, 10 %, 20 %, 30%) of hexagonal (H) infills. The proposed method provided different mechanical strength from those obtained by ASTM D790. The percentage increase of the UFS was inversely proportional to the increase of the material infill percentage.
Keywords
Additive manufacturing, 3D printing, deposição de material fundido (FDM), three-point bending test, Area Moment of Inertia
