Version 1
: Received: 13 March 2018 / Approved: 14 March 2018 / Online: 14 March 2018 (08:40:34 CET)
Version 2
: Received: 9 April 2018 / Approved: 9 April 2018 / Online: 9 April 2018 (10:33:56 CEST)
Kuznetsov, V., Solonin, A., Tavitov, A., Urzhumtsev, O. and Vakulik, A. (2019), "Increasing strength of FFF three-dimensional printed parts by influencing on temperature-related parameters of the process", Rapid Prototyping Journal, 2019. https://doi.org/10.1108/RPJ-01-2019-0017
Kuznetsov, V., Solonin, A., Tavitov, A., Urzhumtsev, O. and Vakulik, A. (2019), "Increasing strength of FFF three-dimensional printed parts by influencing on temperature-related parameters of the process", Rapid Prototyping Journal, 2019. https://doi.org/10.1108/RPJ-01-2019-0017
Kuznetsov, V., Solonin, A., Tavitov, A., Urzhumtsev, O. and Vakulik, A. (2019), "Increasing strength of FFF three-dimensional printed parts by influencing on temperature-related parameters of the process", Rapid Prototyping Journal, 2019. https://doi.org/10.1108/RPJ-01-2019-0017
Kuznetsov, V., Solonin, A., Tavitov, A., Urzhumtsev, O. and Vakulik, A. (2019), "Increasing strength of FFF three-dimensional printed parts by influencing on temperature-related parameters of the process", Rapid Prototyping Journal, 2019. https://doi.org/10.1108/RPJ-01-2019-0017
Abstract
Current work investigates how user-controlled parameters of 3D printing process define temperature conditions on the boundary between layers of the part being fabricated and how these conditions influence structure and strength of the part. The process studied is fused filament fabrication with a desktop 3D printer and the material utilized is PLA (polylactic acid). As a characteristic of the part strength the fracture load in the case of a three-point bend and calculated related stress were used. During the printing process parts were oriented the long side along the Z axis, thus, in the bend tests, the maximum stress occurred orthogonally to the layers. During the fabrication process temperature distribution on the samples surface was monitored with thermal imager. Sample mesostructure was analyzed using SEM. The influence of the extrusion temperature, the intensity of part cooling, the printing speed and the time between printing individual layers were considered. The influence of all the parameters can be expressed through two generalizing factors: the temperature of the previous layer and the flow efficiency, determining the ratio of the amount of extruded plastic to the calculated. A regression model was proposed that describes the effect of the two factors on the printed part strength. Along with interlayer bonding strength, these two factors determine the formation of the part mesostructure (the geometry of the boundaries between individual threads). It is shown that the optimization of the process parameters responsible for temperature conditions makes it possible to approximate the strength of the interlayer cohesion to the bulk material strength.
Keywords
additive manufacturing; desktop 3D printing; fused deposition modeling; fused filament fabrication; polylactic acid; anisotropy; interlayer bonds; mechanical strength; digital fabrication
Subject
Chemistry and Materials Science, Polymers and Plastics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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