INVESTIGATION AND ANALYSIS OF INFILL DENSITY ON IMPACT PROPERTY OF PLA IN 3D PRINTING

Abstract

With increased interest using of 3D printing and the development of the STL file and the open-access CAD: It is important to determine which density and density patterns will provide the perfect strength for various applications. This is of great importance because in additives manufacturing (AM), the CAD model does not have any information about the Infill pattern. In this work the effect of density in printed parts is analyzed by mechanical properties. The sample is generated with the effect of some parameters as well as with constant parameters (print speed, layer thickness, part orientation and shell thickness) based upon the Cura program data. The parts are constructed using polylactic acid (PLA) material with the “Cura software program” from Ultimaker 3D printer. Impact test shows that the increasing of impact strength and fracture toughness that depend on the infill density (20%, 35%, 50%, 65%, and 80%) of the impact specimens which Increasing of infill density leads to increasing of impact test value which obtains the maximum value of impact strength (18.5 KJ/m2 ) and the maximum value of fracture toughness (7.197 KJ/m 3/2). Therefore, this paper discusses the empirical analysis of the effect of infill density on fused deposition modeling (FDM) specimens made of polylactic acid (PLA).