Abstract
Material extrusion (ME), an extrusion-based rapid prototyping technique, has been extensively studied to manufacture final functional products, whose forming quality is significantly influenced by the melt flow behavior (MFB) inside the extrusion liquefier. Applied vibration has a great potential to improve the MFB, and thereby promote the forming quality of the built product. To reveal the mechanism, a dynamic model of the melt flow behavior (DMMFB) is established based on fluid dynamics, Tanner nonlinear constitutive equation and Newton’s power law equation. The MFB, i.e., pressure drop, shear stress and apparent viscosity, is investigated without and with different vibration applied. The corresponding finite element analysis (FEA) is then carried out. From the comparison between DMMFB and FEA results, it is concluded that the proposed model is reliable. When vibration is applied onto the extrusion liquefier, the time-domain MFB will change periodically. Its effective value decreases significantly, and further decreases with the increase of vibration frequency or amplitude. This paper provides the theoretical basis to improve the MFB by applied vibration, and thereby to enhance the forming quality of ME products.
Highlights
Material extrusion (ME), used by ISO/ASTM 52900:2015 to include FDM/FFF technologies, is one of the most promising rapid prototyping techniques [1,2] due to the advantages of ease of operation, low cost, broad resources of raw materials, etc
This paper establishes a dynamic model of the melt flow behavior (MFB) (DMMFB) to analyze the pressure drop, shear stress and apparent viscosity in the ME liquefier without and with different vibrations applied
The MFB results within ME are compared between dynamic model of the melt flow behavior (DMMFB) and finite element analysis (FEA), and the
Summary
Material extrusion (ME), used by ISO/ASTM 52900:2015 to include FDM (fused deposition molding)/FFF (fused filament fabrication) technologies, is one of the most promising rapid prototyping techniques [1,2] due to the advantages of ease of operation, low cost, broad resources of raw materials, etc. Few scholars have proposed this concept at present [22,23], and little corresponding information (either theoretical or experimental data) is available To cover this gap, this paper establishes a dynamic model of the MFB (DMMFB) to analyze the pressure drop, shear stress and apparent viscosity in the ME liquefier without and with different vibrations applied. ME, pressure drop, shear stress and apparent viscosity, is related to the technical reference to i.e., improve the forming quality of similar manufacturing processes (like injection molding) geometry and size in ofindustry. The MFB within ME, i.e., pressure drop, shear stress and apparent viscosity, is related to the of the melt..The interior theof liquefier can be mainly dividedliquefier, into three geometric regions, as shown in geometry andof size the internal passage of the extrusion as well as the viscoelastic. After the solution was completed, the corresponding information in terms of MFB could be obtained by entering the post-processing sub-module
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