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dc.contributor.advisorNeu, Richard W.
dc.contributor.advisorCowan, Richard S.
dc.contributor.authorSiopis, Matthew James
dc.date.accessioned2016-05-27T13:09:34Z
dc.date.available2016-05-27T13:09:34Z
dc.date.created2015-05
dc.date.issued2015-01-06
dc.date.submittedMay 2015
dc.identifier.urihttp://hdl.handle.net/1853/54854
dc.description.abstractMetal on metal wear at high sliding speeds and high contact pressures results in the melting of one or both of the sliding solid bodies due to heat generated at the contact interface. Understanding the influence of sliding speeds, contact pressures and material properties on wear rates is important in developing predictive models for designing more efficient and effective engineering system components. Typical engineering applications subjected to these extreme conditions include ultrahigh speed machining, rocket sleds, large caliber cannon, and electromagnetic launchers. Sliding speeds on the order of 1,000 m/s and contact pressures in excess of 100 MPa are common in these applications and difficult to replicate in a laboratory environment. A unique wedge experiment using a minor caliber electromagnetic launcher has been developed and implemented to characterize wear deposition of a 6061-T6 aluminum sliding body on several different guider materials of varying mechanical and thermal properties at sliding speeds from 0 – 1,200 m/s and contact pressures from 100 – 225 MPa. Optical microscopy and 3D profilometry were used to characterize and quantify the slider wear. Three distinct wear regions, plasticity dominated, severe plastic deformation and melt lubrication were observed. Test results provided evidence that the aluminum slider contact interface was molten. Modeling of the experimental wear data showed a dependence on pressure and velocity and guider material properties, density and specific heat. A predictive wear model was developed for the melt lubrication region as a tool for designing components subjected to similar operating conditions.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectWear
dc.subjectWear mechanisms
dc.subjectWear model
dc.subjectMelt lubrication
dc.subjectSliding contact
dc.subjectHigh contact pressures
dc.subjectHigh velocity
dc.subjectAluminum
dc.subjectMaterials selection
dc.titleWear at high sliding speeds and high contact pressures
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentMechanical Engineering
thesis.degree.levelDoctoral
dc.contributor.committeeMemberStreator, Jeffrey L
dc.contributor.committeeMemberBair, Scott S.
dc.contributor.committeeMemberThadhani, Naresh
dc.date.updated2016-05-27T13:09:34Z


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