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| Incorporating Fluid-Structure Interaction in the Optimization-Based Design of Polymer Sheeting Dies | ||||
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The die design example shown here illustrates our design methodology where the pressure drop across the die is minimized with a constraint on exit flow rate uniformity. The die cavity half-height within a coat-hanger die is adjusted to achieve the best die cavity shape while considering the effect of die cavity deformation. Die deformations as high as 13% of the gap height are computed which have a significant effect on melt flow and the optimal die geometry.
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| Selected Publications | ||||
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An Analysis of Fluid-Structure Interaction in the Optimization-Based Design of Polymer Sheeting
Dies. Q. Wang and D.E. Smith. Manuscript under review in Journal of Applied Polymer
Science, July 2006. |
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| Contributing Researchers | ||||
| Qi Wang | Douglas E. Smith | |||
| Sources of Funding | ||||
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The die design approach developed here enhances previous design methodologies by incorporating the polymer melt flow analysis and a 3-D die deformation analysis in an optimization-based design procedure. In this work, both polymer melt flow and sheeting die deformation are analyzed with the general purpose finite element program ABAQUS. The approach includes a user-defined element that is used to evaluate the purely viscous non-Newtonian flow in a flat die. The generalized Hele-Shaw flow equation for an isothermal Carreau-Yasuda fluid is used to obtain the pressure field on the internal surface of the die body. Die deformation is also analyzed with ABAQUS. In addition, shape optimization of a polymer sheeting die is performed by incorporating the coupled analyses in the VRAND SQP constrained optimization algorithm.
Displacement Magnitude of Die Body (Deformation Scale Factor: 336)
Die Cavity Half-Height Distribution
Exit flow rate for coat hanger die design