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Rheological characterization of commercial glass mat thermoplastics (GMTs) by squeeze flow testing

Lookup NU author(s): Dr George Kotsikos, Professor Geoff Gibson


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The flow behavior of commercial glass mat thermoplastics (GMTs) has been investigated by isothermal axisymmetric squeeze flow testing between parallel circular plates. Tests have been performed over a range of squeeze rates and the analysis is based on simple power law constitutive equations. A key part of the work is determining the relative contributions of shear and extensional flow to the overall squeezing force response. By developing a variational flow model, based on the upper bound theory, the behavior has been found to be predominantly extensional, with shear effects becoming important at very small plate separations. In addition, a predictive model for the radial pressure distribution during squeezing has been developed, based on fiber suspension rheology. Since fibers are generally long or continuous, treating the material as a statistically homogeneous fluid does not yield accurate results in this respect.

Publication metadata

Author(s): Kotsikos G, Bland JH, Gibson AG

Publication type: Article

Publication status: Published

Journal: Polymer Composites

Year: 1999

Volume: 20

Issue: 1

Pages: 114-123

Print publication date: 01/02/1999

ISSN (print): 0272-8397

ISSN (electronic): 1548-0569

Publisher: John Wiley & Sons, Inc.


DOI: 10.1002/pc.10339


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