TY - GEN
T1 - THE EFFECT OF SPREADING ON DIRECT INK WRITING ADDITIVE MANUFACTURING OF PHOTOCURED RESINS
AU - Yoon, Heedong
AU - Yancheshme, Amir Azimi
AU - Pan, Shihao
AU - Cordia, Matthew
AU - Idrees, Mohanad
AU - Palmese, Giuseppe
AU - Alvarez, Nicolas J.
N1 - Publisher Copyright:
Copyright 2022. Used by the Society of the Advancement of Material and Process Engineering with permission.
PY - 2022
Y1 - 2022
N2 - Direct ink writing is a versatile tool that is capable of printing thermoset resins in large format parts. Although there are many advantages to DIW, there are significant hurdles to overcome regarding the ideal resin rheology to ensure successful printing and good mechanical performance. Determining the optimum flow behavior of 3D printing fluids is extremely important to determine the final products' internal structure and performance. It has been shown that the shape and properties of the filament during the printing process are highly affected by the shear-thinning behavior and spreading of fluids. For instance, if the viscosity is too low or wettability is high, the resin spreads quickly; making it difficult to print the resin using DIW. On the other hand, if the viscosity is too high or wettability is low, printed filaments have poor cohesive strength and the mechanical properties of the part are low. In this work, we use rheology to investigate the correlation between shear thinning behavior and the spreading of filaments for model photocurable thermoset resin, denoted as DA2, which is doped with fumed silica to modify the rheology. The shear thinning behavior is directly correlated to the amount of silica additive, and the spreading during printing was observed to follow a power-law behavior with time. We find that spreading of filament is increased with increasing infill rate due to the shear thinning behavior of the resin.
AB - Direct ink writing is a versatile tool that is capable of printing thermoset resins in large format parts. Although there are many advantages to DIW, there are significant hurdles to overcome regarding the ideal resin rheology to ensure successful printing and good mechanical performance. Determining the optimum flow behavior of 3D printing fluids is extremely important to determine the final products' internal structure and performance. It has been shown that the shape and properties of the filament during the printing process are highly affected by the shear-thinning behavior and spreading of fluids. For instance, if the viscosity is too low or wettability is high, the resin spreads quickly; making it difficult to print the resin using DIW. On the other hand, if the viscosity is too high or wettability is low, printed filaments have poor cohesive strength and the mechanical properties of the part are low. In this work, we use rheology to investigate the correlation between shear thinning behavior and the spreading of filaments for model photocurable thermoset resin, denoted as DA2, which is doped with fumed silica to modify the rheology. The shear thinning behavior is directly correlated to the amount of silica additive, and the spreading during printing was observed to follow a power-law behavior with time. We find that spreading of filament is increased with increasing infill rate due to the shear thinning behavior of the resin.
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M3 - Conference contribution
AN - SCOPUS:85136306443
T3 - International SAMPE Technical Conference
BT - SAMPE 2022 Conference and Exhibition
PB - Soc. for the Advancement of Material and Process Engineering
T2 - SAMPE 2022 Conference and Exhibition
Y2 - 23 May 2022 through 26 May 2022
ER -