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Document Type

Original Study

Subject Areas

Mechanical Engineering

Keywords

Fused Deposition Modelling (FDM), 3D Printing, Combined infill patterns (CIP), half-by-half (HBH) building strategy, layer-by-layer (LBL) building strategy, Strategy of layers sequence, Mechanical properties.

Abstract

Fused Deposition Modelling (FDM) is a popular 3D printing technique that is growing rapidly because it can produce complex shapes directly from CAD models. Its mechanical behavior needs to be thoroughly investigated with consideration of its growing applications in order to be used as an end-use functional part in various industries.This functional parts are affected due to their lower mechanical properties so the wide variety of FDM process parameters made it challenging to assess the mechanical behavior of the it’s part. This paper aims to investe layer arrangements of different building strategies on tensile behavior of combining infill pattern samples by FDM. Four printing patterns called Concentric, Grid, Cubic, and Gyroid were used singly and in combination in samples at an infill density of 70%, 0.15 mm layer thickness, and flat-built orientation. Combined infill pattern (CIP) parts are printed from thermoplastic polylactic acid (PLA), and those are mechanically tested to obtain tensile strength, elongation at failure, and hardness. Further, the printing time was also checked for the printed samples. The results obtained revealed that the combination of Concentric/Grid with layer-by-layer (LBL) strategy, which means a concentric layer by grid layer (0.15 mm top and bottom thickness), has the highest tensile strength (34 MPa) compared to the Grid/Cubic infill pattern with half-by-half (HBH) strategy, which means half the number of layers built by Grid and the other half built by Cubic (0.8 mm top and bottom thickness), which had the lowest tensile strength (26 MPa) while printing time increased and hardness did not change noticeably.

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