Jianchi Huang - Academia.edu (original) (raw)
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Papers by Jianchi Huang
Spray coating is a facile coating and deposition process with numerous existing and emerging appl... more Spray coating is a facile coating and deposition process with numerous existing and emerging applications. However, it is a stochastic process comprising impingement of many droplets, which upon impact on a heated substrate may dry individually or coalesce first to make a thin liquid film and then dry to make a thin solid film. There is very limited knowledge on how this process occurs; therefore in this work, high speed imaging is used to visualize the spray coating process. Two model solutions including food-dye with properties similar to those of water, and PEDOT:PSS, a polymeric solution, are sprayed onto glossy paper and regular glass substrates. Substrates are kept at room temperature and elevated temperature of 80 °C. In some cases, a vertical ultrasonic vibration is imposed on the substrate to study its effect on the coating process. In conclusion, it is observed that the spray coating process is highly random and stochastic. A higher substrate temperature results in better ...
Journal of Manufacturing Processes, 2021
Journal of Manufacturing Processes, 2021
Abstract An experimental study was conducted on the effects of point distance and hatch distance ... more Abstract An experimental study was conducted on the effects of point distance and hatch distance on pore formation in selective laser melting of tungsten. The Archimedes’ method was used to measure the apparent and closed porosities. Apparent (open) porosity and closed porosity were found to follow different trends: the apparent porosity increased but the closed porosity decreased as hatch distance or point distance increased. The open pores are attributed to the lack of fusion at the large hatch distance or point distance while the closed pores are attributed to the possible spattering and keyhole formation at the smaller hatch distance or point distance. The results led to understanding the effects of hatch distance and point distance on the formation of open and closed pores and provided insight on the optimization of process parameters to further increase the relative bulk density.
Journal of Manufacturing Science and Engineering, 2021
An experimental study was conducted to study the effects of geometric size and surface treatment ... more An experimental study was conducted to study the effects of geometric size and surface treatment on the fatigue life of fused filament fabrication (FFF) manufactured acrylonitrile butadiene styrene (ABS) parts. Moore rotating-beam fatigue tests were conducted with four different levels of loadings to obtain the S–N curves. Two different sizes (control size and large size) and three different surface treatment methods (as-printed, acetone-treated, and sandpaper polished) were studied. The larger specimens had significantly decreased fatigue life because of a larger volume, and hence a greater probability of defects for crack initiation and propagation, as compared with the control specimen. The acetone-treated specimen had a smooth surface. Its fatigue life, however, decreased significantly because the acetone treatment caused internal damage that weakened the specimen and was reported for the first time. The sandpaper polished specimen also had a smooth surface, but its effect on th...
Journal of Shanghai Jiaotong University (Science)
Spray coating is a facile coating and deposition process with numerous existing and emerging appl... more Spray coating is a facile coating and deposition process with numerous existing and emerging applications. However, it is a stochastic process comprising impingement of many droplets, which upon impact on a heated substrate may dry individually or coalesce first to make a thin liquid film and then dry to make a thin solid film. There is very limited knowledge on how this process occurs; therefore in this work, high speed imaging is used to visualize the spray coating process. Two model solutions including food-dye with properties similar to those of water, and PEDOT:PSS, a polymeric solution, are sprayed onto glossy paper and regular glass substrates. Substrates are kept at room temperature and elevated temperature of 80 °C. In some cases, a vertical ultrasonic vibration is imposed on the substrate to study its effect on the coating process. In conclusion, it is observed that the spray coating process is highly random and stochastic. A higher substrate temperature results in better ...
Journal of Manufacturing Processes, 2021
Journal of Manufacturing Processes, 2021
Abstract An experimental study was conducted on the effects of point distance and hatch distance ... more Abstract An experimental study was conducted on the effects of point distance and hatch distance on pore formation in selective laser melting of tungsten. The Archimedes’ method was used to measure the apparent and closed porosities. Apparent (open) porosity and closed porosity were found to follow different trends: the apparent porosity increased but the closed porosity decreased as hatch distance or point distance increased. The open pores are attributed to the lack of fusion at the large hatch distance or point distance while the closed pores are attributed to the possible spattering and keyhole formation at the smaller hatch distance or point distance. The results led to understanding the effects of hatch distance and point distance on the formation of open and closed pores and provided insight on the optimization of process parameters to further increase the relative bulk density.
Journal of Manufacturing Science and Engineering, 2021
An experimental study was conducted to study the effects of geometric size and surface treatment ... more An experimental study was conducted to study the effects of geometric size and surface treatment on the fatigue life of fused filament fabrication (FFF) manufactured acrylonitrile butadiene styrene (ABS) parts. Moore rotating-beam fatigue tests were conducted with four different levels of loadings to obtain the S–N curves. Two different sizes (control size and large size) and three different surface treatment methods (as-printed, acetone-treated, and sandpaper polished) were studied. The larger specimens had significantly decreased fatigue life because of a larger volume, and hence a greater probability of defects for crack initiation and propagation, as compared with the control specimen. The acetone-treated specimen had a smooth surface. Its fatigue life, however, decreased significantly because the acetone treatment caused internal damage that weakened the specimen and was reported for the first time. The sandpaper polished specimen also had a smooth surface, but its effect on th...
Journal of Shanghai Jiaotong University (Science)