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Implications of extensional flows in polymer fabrication processes
Author(s) -
Denson C. D.
Publication year - 1973
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.760130208
Subject(s) - extensional definition , rheology , extensional viscosity , materials science , fabrication , flow (mathematics) , constitutive equation , polymer , mechanics , geology , thermodynamics , composite material , physics , medicine , paleontology , alternative medicine , pathology , finite element method , shear viscosity , tectonics
The various types of extensional flows and extensional viscosities are defined and methods of measurement discussed. The role that each of these extensional viscosities plays in various polymer fabrication processes is discussed with examples. Finally, it is shown how engineering analyses of these complex flow fields are conducted using simplified phenomenological equations for the rheological behavior. This approach is recommended for use until such time as tensorially correct, mathematically tractable constitutive equations that are based on molecular theory are available.