Abstract
The properties of fused deposition modeling (FDM) products exhibit strong dependence on process parameters which may be improved by setting suitable levels for parameters related to FDM. Anisotropic and brittle nature of 3D-printed components makes it essential to investigate the effect of FDM control parameters to different performance metrics related to resistance for improving strength of functional parts. In this work the flexural strength of polyethylene terephthalate glycol (PET-G) is examined under by altering the levels of different 3D-printing parameters such as layer height, infill density, deposition angle, printing speed and printing temperature. A response surface experiment was established having 27 experimental runs to obtain the results for flexural strength (MPa) and to further investigate the effect of each control parameter on the response by studying the results using statistical analysis. The experiments were conducted as per the ASTM D790 standard. The regression model generated for flexural strength adequately explains the variation of FDM control parameters on flexural strength and thus, it can be implemented to find optimal parameter settings with the use of either an intelligent algorithm, or neural network.
Highlights
Fused deposition modelling is a widely known additive manufacturing method where the material in the form of filament is deposited in a “layer-by-layer” technique [1-4]
This study focuses on the experimental investigation of the effect of five important fused deposition modelling parameters, namely layer height, infill density; deposition angle, printing speed and printing temperature on the response of flexural strength (MPa) of PLA fabricated specimens designed as per the ASTM D790 standard
The response surface design allowed for the examination of the non-linear behaviour of fused deposition modeling (FDM) control parameters on flexural strength (MPa)
Summary
Fused deposition modelling is a widely known additive manufacturing method where the material in the form of filament is deposited in a “layer-by-layer” technique [1-4]. The response surface experiment involved 27 runs This design was selected to examine all possible interactions among the five FDM control parameters and establish a continuous experimental domain. The response surface design assists on studying the non-linear effect of all parameters to the response of flexural strength expressed through the stress (MPa) at severe deformation or total failure. 16, 17 and 18 exhibited the highest flexural strength, i.e., 76.71, 76.35 and 78.18 (MPa) respectively This observation indicates that a layer height 0.2 mm, an infill density 100%, a deposition angle 0 deg. This observation indicates that a layer height 0.2 mm, an infill density 100%, a deposition angle 0 deg. and a printing speed 50 mm/sec, are close to the most advantageous parameter levels in terms of PET-G material printing, under a temperature varying from 230oC to 250oC
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