Using startup of steady shear flow in a sliding plate rheometer to determine material parameters for the purpose of predicting long fiber orientation

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dc.contributorVirginia Techen
dc.contributor.authorOrtman, Kevinen
dc.contributor.authorBaird, Donald G.en
dc.contributor.authorWapperom, Peteren
dc.contributor.authorWhittington, Abby R.en
dc.contributor.departmentChemical Engineeringen
dc.contributor.departmentMathematicsen
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessed2014-01-31en
dc.date.accessioned2014-01-30T17:54:55Zen
dc.date.available2014-01-30T17:54:55Zen
dc.date.issued2012-07-01en
dc.description.abstractThe properties of long glass fiber reinforced parts, such as those manufactured by means of injection molding and compression molding, are highly dependent on the fiber orientation generated during processing. A sliding plate rheometer was used to understand the transient stress and orientation development of concentrated long glass fibers during the startup of steady shear flow. An orientation model and stress tensor combination, based on semiflexible fibers, was assessed in its ability to predict fiber orientation when using model parameters obtained from the fits of the stress responses. Specifically, samples of different initial fiber orientations was subjected to the startup of steady shear flow, and an orientation model based on bead and rod theory was coupled with a derived stress tensor that accounts for the semiflexibility of the fibers to obtain the corresponding model parameters. The results showed the semiflexible orientation model and stress tensor combination, overall, provided improved rheological results as compared to the Folgar-Tucker model when coupled with the stress tensor of Lipscomb et al. [J. Non-Newtonian Fluid Mech. 26, 297-325 (1988)]. Furthermore, it was found that both stress tensors required empirical modification to accurately fit the measured data. Finally, orientation models provided encouraging results when predicting the transient fiber orientation for all initial fiber orientations explored. (C) 2012 The Society of Rheology. [http://dx.doi.org/10.1122/1.4717496]en
dc.description.sponsorshipNational Science FoundationCMMI-0853537en
dc.identifier.citationOrtman, Kevin; Baird, Donald; Wapperom, Peter; et al., "Using startup of steady shear flow in a sliding plate rheometer to determine material parameters for the purpose of predicting long fiber orientation," J. Rheol. 56, 955 (2012); http://dx.doi.org/10.1122/1.4717496en
dc.identifier.doihttps://doi.org/10.1122/1.4717496en
dc.identifier.issn0148-6055en
dc.identifier.urihttp://hdl.handle.net/10919/25232en
dc.identifier.urlhttp://scitation.aip.org/content/sor/journal/jor2/56/4/10.1122/1.4717496en
dc.language.isoen_USen
dc.publisherAIP Publishingen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectRheological propertiesen
dc.subjectDynamic simulationen
dc.subjectFlexible fibersen
dc.subjectSuspensionsen
dc.subjectModelen
dc.subjectBehavioren
dc.subjectFluidsen
dc.subjectParticlesen
dc.subjectKineticsen
dc.subjectTensorsen
dc.titleUsing startup of steady shear flow in a sliding plate rheometer to determine material parameters for the purpose of predicting long fiber orientationen
dc.title.serialJournal of Rheologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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