Obtaining reliable transient rheological data on concentrated short fiber suspensions using a rotational rheometer

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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.issued2009-09-01en
dc.description.abstractThe conventional method for obtaining transient rheological data on short glass fiber-filled polymeric fluids is to use the parallel disk (PP) geometry in a rotational rheometer. Using the PP geometry large transient stress overshoot behavior was observed during the startup of flow measurements on a 30 wt% short glass fiber-filled polybutylene terephthalate. A contributing factor to this behavior is believed to be induced fiber collisions caused by the inhomogeneous velocity field (radial varying velocity gradient). A novel approach was taken in which a "donut" shaped sample was used in a cone-and-plate device (CP-D) to maintain a sufficient gap to fiber length ratio. The magnitude of the first normal stress difference was reduced by 70%, and the time to reach steady state was reduced by 100 strain units. The Lipscomb model coupled with the Folgar-Tucker model for the evolution of fiber orientation was fit to the stress growth behavior measured using both the PP geometry and CP-D resulting in different parameters. In addition, the fitted model parameters were found to depend on the initial fiber orientation. It is believed that the CP-D allows for an accurate determination of the stress growth behavior and eventually will allow one to obtain unambiguous model parameters. (C) 2009 The Society of Rheology. [DOI: 10.1122/1.3177348]en
dc.description.sponsorshipNational Science Foundationen
dc.description.sponsorshipDepartment of Energy DMI-0521918en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationEberle, Aaron P. R.; Baird, Donald G.; Wapperom, Peter; et al., "Obtaining reliable transient rheological data on concentrated short fiber suspensions using a rotational rheometer," J. Rheol. 53, 1049 (2009); http://dx.doi.org/10.1122/1.3177348en
dc.identifier.doihttps://doi.org/10.1122/1.3177348en
dc.identifier.issn0148-6055en
dc.identifier.urihttp://hdl.handle.net/10919/25228en
dc.identifier.urlhttp://scitation.aip.org/content/sor/journal/jor2/53/5/10.1122/1.3177348en
dc.language.isoenen
dc.publisherAIP Publishingen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSimple shear-flowen
dc.subjectModel predictionsen
dc.subjectRodlike particlesen
dc.subjectOrientationen
dc.subjectMotionen
dc.subjectComposite materialsen
dc.subjectFluidsen
dc.subjectRodsen
dc.titleObtaining reliable transient rheological data on concentrated short fiber suspensions using a rotational rheometeren
dc.title.serialJournal of Rheologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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