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Rheology of short glass fiber‐reinforced thermoplastics and its application to injection molding I. Fiber motion and viscosity measurement
Author(s) -
Crowson R. J.,
Folkes M. J.,
Bright P. F.
Publication year - 1980
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.760201403
Subject(s) - materials science , rheology , composite material , flow (mathematics) , viscosity , fiber , glass fiber , shear flow , molding (decorative) , shear (geology) , orientation (vector space) , mechanics , geometry , mathematics , physics
A study has been made of the fiber orientation in short glass fiber‐filled thermoplastics resulting from convergent, divergent and shear flows. Convergent flow results in high fiber alignment along the flow direction, whereas diverging flow causes the fibers to align at 90° to the major flow direction. Shear flow produces a decrease in alignment parallel to the flow direction and the effect is pronounced at low flow rates. Non‐linear Bagley plots have been observed, under some conditions, during rheological measurements. The data are consistent with a pressure dependent viscosity.