Using transient shear rheology to determine material parameters in fiber suspension theory

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dc.contributorVirginia Techen
dc.contributor.authorEberle, A. P. R.en
dc.contributor.authorBaird, Donald G.en
dc.contributor.authorWapperom, Peteren
dc.contributor.authorVelez-Garcia, G. M.en
dc.contributor.departmentChemical Engineeringen
dc.contributor.departmentMathematicsen
dc.date.accessed2014-01-31en
dc.date.accessioned2014-01-30T17:54:54Zen
dc.date.available2014-01-30T17:54:54Zen
dc.date.issued2009-05-01en
dc.description.abstractFiber suspension theory model parameters for use in the simulation of fiber orientation in complex flows are, in general, either calculated from theory or fit to experimentally determined fiber orientation generated in processing flows. Transient stress growth measurements in startup of shear flow and flow reversal in the shear rate range, (gamma)over dot = 1-10 s(-1), were performed on a commercially available short glass fiber-filled polybutylene terephthalate using a novel "donut-shaped" sample in a cone-and-plate geometry. Predictions using the Folgar-Tucker model for fiber orientation, with a "slip" factor, combined with the Lipscomb model for stress were fit to the transient stresses at the startup of shear flow. Model parameters determined by fitting at (gamma)over dot = 6 s(-1) allowed for reasonable predictions of the transient stresses in flow reversal experiments at all the shear rates tested. Furthermore, fiber orientation model parameters determined by fitting the transient stresses were compared to the experimentally determined evolution of fiber orientation in startup of flow. The results suggested that fitting model predictions to the stress response in well-defined flows could lead to unambiguous model parameters provided the fiber orientation as a function of time or strain at some shear rate was known. (C)2009 The Society of Rheology. [DOI: 10.1122/1.3099314]en
dc.description.sponsorshipNational Science Foundation and Department of Energy DMI-0521918en
dc.identifier.citationEberle, Aaron P. R.; Baird, Donald G.; Wapperom, Peter; et al., "Using transient shear rheology to determine material parameters in fiber suspension theory," J. Rheol. 53, 685 (2009); http://dx.doi.org/10.1122/1.3099314en
dc.identifier.doihttps://doi.org/10.1122/1.3099314en
dc.identifier.issn0148-6055en
dc.identifier.urihttp://hdl.handle.net/10919/25229en
dc.identifier.urlhttp://scitation.aip.org/content/sor/journal/jor2/53/3/10.1122/1.3099314en
dc.language.isoen_USen
dc.publisherAIP Publishingen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSimple injection moldingsen
dc.subjectClosure approximationsen
dc.subjectViscous fluidsen
dc.subjectOrientationen
dc.subjectFlowen
dc.subjectParticlesen
dc.subjectMotionen
dc.subjectComposite materialsen
dc.subjectStressen
dc.subjectModelen
dc.titleUsing transient shear rheology to determine material parameters in fiber suspension theoryen
dc.title.serialJournal of Rheologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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