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Stamping rheology of glass mat reinforced thermoplastic composites

โœ Scribed by S. M. Davis; K. P. McAlea

Publisher
Society for Plastic Engineers
Year
1990
Tongue
English
Weight
922 KB
Volume
11
Category
Article
ISSN
0272-8397

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โœฆ Synopsis

Abstract

Glass mat reinforced thermoplastics (GMTs) offer a useful combination of mechanical properties and formability. In principle, these composites may be based on any thermoplastic matrix. In practice, matrix selection is limited because of its impact on the manufacturing and compression molding processes. In this work an isothermal squeezing flow technique is used to determine the apparent biaxial extensional viscosities of polycarbonate, polybutylene terephthalate, and polypropyleneโ€based GMTs. Experimental loadโ€deformation data are interpreted by treating the GMTs as viscous, incompressible Newtonian fluids. Two primary effects are observed: (1) the composites appear to strain harden as they are deformed, and (2) GMT apparent biaxial extensional viscosities correlate with the high rate of deformation shear viscosities of the matrices. A mechanism that explains the second result is proposed.

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