Preprint Article Version 2 This version is not peer-reviewed

Increasing of Strength of FDM (FFF) 3D Printed Parts by Influencing on Temperature-Related Parameters of the Process

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)

How to cite: Kuznetsov, V.E.; Solonin, A.N.; Tavitov, A.G.; Urzhumtsev, O.D.; Vakulik, A.H.. Increasing of Strength of FDM (FFF) 3D Printed Parts by Influencing on Temperature-Related Parameters of the Process. Preprints 2018, 2018030102 (doi: 10.20944/preprints201803.0102.v2). Kuznetsov, V.E.; Solonin, A.N.; Tavitov, A.G.; Urzhumtsev, O.D.; Vakulik, A.H.. Increasing of Strength of FDM (FFF) 3D Printed Parts by Influencing on Temperature-Related Parameters of the Process. Preprints 2018, 2018030102 (doi: 10.20944/preprints201803.0102.v2).

Abstract

This work investigates how the user-controlled parameters of the 3D printing process define temperature conditions on the boundary between layers of the part being fabricated and how these conditions influence the 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 with 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 sample 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.

Subject Areas

additive manufacturing; desktop 3D printing; fused deposition modeling; fused filament fabrication; polylactic acid; anisotropy; interlayer bonds; mechanical strength; digital fabrication

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