Toward the understanding of temperature effect on bonding strength, dimensions and geometry of 3D-printed parts

Fused filament fabrication (FFF), which is an additive manufacturing technique, opens alternative possibilities for complex geometries fabrication. However, its use in functional products is limited due to anisotropic strength issues. Indeed, the strength of FFF fabricated parts across successive la...

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Bibliographic Details
Published in:Journal of materials science 2020-10, Vol.55 (29), p.14677-14689
Main Authors: Vanaei, H. R., Raissi, K., Deligant, M., Shirinbayan, M., Fitoussi, J., Khelladi, S., Tcharkhtchi, A.
Format: Article
Language:English
Subjects:
3D printing
Anisotropy
Bonding strength
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystal structure
Crystallinity
Crystallization
Crystallography and Scattering Methods
Engineering Sciences
Fused deposition modeling
Heat treating
Materials
Materials Science
Melt temperature
Polymer Sciences
Polymers & Biopolymers
Solid Mechanics
Structural stability
Temperature effects
Temperature gradients
Three dimensional printing
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Summary:Fused filament fabrication (FFF), which is an additive manufacturing technique, opens alternative possibilities for complex geometries fabrication. However, its use in functional products is limited due to anisotropic strength issues. Indeed, the strength of FFF fabricated parts across successive layers in the build direction ( Z direction) can be significantly lower than the strength in X – Y directions. This strength weakness has been attributed to poor bonding between printed layers. This bonding depends on the temperature of the current layer being deposited—at melting temperature ( T m )—and the temperature of the previously deposited layer. It is assumed that depositing a layer at T m on a layer at temperature around crystallization temperature ( T c ) would enable higher material crystallinity and thus better bonding between previous and present layers. On the contrary, if the previous layer temperature is below T c , material crystallinity will be low and bonding strength weak. This paper aims at studying the significant effect of temperature difference (Δ T ) between previous and current deposited layers temperatures on (1) inter-layers bonding strength improvement and (2) part dimensions, geometry and structure stability. A 23% increase in the inter-layers bonding strength for previous layer temperature slightly higher than T c reported here confirms the above assumption and offers a first solution toward the increase in inter-layers bonding strength in FFF. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-020-05057-9