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Effect of extensional viscosity and wall quenching on modeling of mold fillings
Author(s) -
Moller James C.,
Lee Daeyong,
Kibbel Bradley W.,
Mangapora Leslie
Publication year - 1995
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760351804
Subject(s) - extensional viscosity , materials science , viscosity , composite material , quenching (fluorescence) , thermodynamics , shear rate , finite element method , shear (geology) , extensional definition , mechanics , shear viscosity , physics , geology , paleontology , tectonics , fluorescence , quantum mechanics
Abstract A combined finite element and finite difference approach has been developed to include the capability to model fluid and thermal transport for the filling of a die cavity by a fluid that has differing sensitivities to extensional and shear deformation rates. This is referred to here as a dual viscosity fluid. For the case of mildly convergent or divergent quasi two‐dimensional flows, a viscosity model is described that has such a dual‐viscosity character and in which shear and extension rate sensitivities are nearly separated. Filling simulation results can be generated rapidly in a modest computational environment. The range of cavities and molding materials that may be modeled realistically is widened by the inclusion of a dual viscosity model. The effect of wall quenching (freezing) increased with decreasing filling rate, while the effect of dual viscosity increased with increasing filling rate.