Browsing by Subject "oxygen diffusion"
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Item Modeling Effects of Oxygen Inhibition in Mask Based Stereolithography(University of Texas at Austin, 2010-09-23) Jariwala, Amit S.; Ding, Fei; Boddapati, Aparna; Breedveld, Victor; Grover, Martha; Henderson, Clifford L.; Rosen, David W.Stereolithography (SL) is an additive manufacturing process in which liquid photopolymer resin is cross-linked and converted to solid with a UV laser light source. Traditional models of SL processes do not consider the complex chemical reactions and species transport occurring during photopolymerization and, hence, are incapable of accurately predicting resin curing behavior. In this paper, a 2D photopolymerization model based on ordinary differential equations is presented that incorporates the effects of oxygen inhibition and diffusion during the polymerization process. This model accurately predicts the cured part height when compared to experiments conducted on a mask based stereolithgraphy system. The simulated results also show the characteristic edge curvature as seen in experiments. Parametric studies were conducted to investigate the possibilities to improve the accuracy of the model for predicting the edge curvature.