Design and Development of a Squeeze-Mode Rheometer for Evaluating Magneto-Rheological Fluids

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dc.contributor.authorCavey, Ryan Haleen
dc.contributor.committeechairAhmadian, Mehdien
dc.contributor.committeememberSandu, Corinaen
dc.contributor.committeememberWest, Robert L. Jr.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:45:45Zen
dc.date.adate2008-11-05en
dc.date.available2014-03-14T20:45:45Zen
dc.date.issued2008-09-09en
dc.date.rdate2010-12-22en
dc.date.sdate2008-09-21en
dc.description.abstractThis study aims to better understand the behavior of magnetorheological (MR) fluids operated in the non-conventional squeeze mode through the use of a custom designed rheometer. Squeeze mode is the least understood of the three operational modes of MR fluid and thus its potential has yet to be realized in practical applications. By identifying the behavior of MR fluid in this mode, the foundation for future development of MR technology will be laid. Using the limited amount of literature available on squeeze-mode operation in conjunction with conventional principles associated with MR technology, a custom rheometer was designed and fabricated. A detailed account of the design considerations and background information on the fundamentals incorporated into the design are provided. The squeeze-mode rheometer was used to evaluate a variety of MR fluids to observe trends that may exist across fluids. Specifically, fluids of different ferrous particle volume fractions were considered. Through testing, common trends in fluid stiffness were observed for multiple fluids tested with the squeeze-mode rheometer. When operated in squeeze mode, activated MR fluid has shown to provide substantial resistance to compressive loading, possibly making it attractive for low-displacement high-load systems. The primary observation from the tests is that the activated fluid's stiffness progressively increases over the duration of fluid operation. This phenomenon is due to severe carrier-fluid separation coupled with the formation of ferrous particle aggregate clumps in the fluid. This effect is further explored in this research.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-09212008-013322en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09212008-013322/en
dc.identifier.urihttp://hdl.handle.net/10919/35139en
dc.publisherVirginia Techen
dc.relation.haspartRyan_Cavey_Masters_Thesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsqueeze flowen
dc.subjectMR fluiden
dc.subjectmagneto-rheologicalen
dc.subjectsqueeze-modeen
dc.subjectrheometeren
dc.subjectMR rheometeren
dc.titleDesign and Development of a Squeeze-Mode Rheometer for Evaluating Magneto-Rheological Fluidsen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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