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Shear and extensional flow of reinforced plastics in injection molding. I. Effects of temperature and shear rate with bulk molding compound
Author(s) -
Gibson A. G.,
Williamson G. A.
Publication year - 1985
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.760251510
Subject(s) - materials science , extensional viscosity , extensional definition , shear (geology) , composite material , molding (decorative) , capillary action , shear flow , shear rate , shear viscosity , viscosity , mechanics , geology , paleontology , physics , tectonics
Abstract Capillary flow studies on bulk molding compound (BMC) using an instrumented injection‐molding machine are reported. The significance of extensional flow effects with fiber‐reinforced materials is emphasized. The extensional flow behavior in converging dies is modeled, and a means of evaluating both extensional and shear viscosity from capillary flow data is proposed. Methods of correcting results for the effect of deformation heating are discussed. The shear and extensional flow behavior of BMC in the temperature region 18 to 58°C can be fitted to a simplified Arrhenius Law.