Pultruded Carbon Fiber/Vinyl Ester Composites Processed with Different Fiber Sizing Agents. Part III: Theoretical Aspects
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VIEW THE REPLYPublication: Journal of Materials in Civil Engineering
Volume 17, Issue 3
Abstract
This paper addresses proposed improvements to the carbon/vinyl ester interface via the use of engineering thermoplastic polymers as sizing agents. Two thermoplastic polymers, K-30 poly(vinylpyrrolidone) (PVP) and a modified polyhydroxyether of Bisphenol A (Phenoxy™) were used as sizings in a controlled study. These sizings were applied to surface treated but unsized AS-4 carbon fibers using a lab-scale sizing line. The standard and commercially available sized AS-4 fiber, was also used for comparison. Predictions of observed tensile and compression strengths of unidirectional, sized carbon fiber–vinyl ester composites fabricated using the pultrusion process were assessed using micromechanical models that take into consideration the influence of the different interfaces. The micromechanical models require inputs on either the interfacial shear strength or the global laminate shear response. The influence of both processing induced differences (misalignment of fibers and fiber damage) as well as the differences in interphase properties (shear response) have been shown to play an important role in describing the observed differences in the interphase varied composites.
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Acknowledgments
The writers would like to thank the National Science Foundation Center High Performance Polymeric Adhesives and Composites for supporting this effort under Grant No. NSFDMR-9120004. In addition, the authors would like to thank the Adhesives and Sealant Council Education Foundation (ASCEF) through the Center for Adhesives and Sealant Science (CASS) at Virginia Tech for financial support. The Virginia Space Grant Consortium also furnished financial support. The writers also thank Mr. Clint Smith at Strongwell Inc. in Bristol, Va. for facilitating the use of their lab-scale pultruder. Material contributions from The Dow Chemical Company, Phenoxy Associates, and BASF are acknowledged. Finally, the writers would like to thank Mr. Bill Shaver in the machine shop and Mr. Robert Simonds for arranging time on the Instron load frame.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 3 • June 2005
Pages: 343 - 352
Copyright
© 2005 ASCE.
History
Received: Feb 3, 2000
Accepted: Jan 26, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
Notes
Note. Associate Editor: Tinh Nguyen
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