Title:
Wear at high sliding speeds and high contact pressures

dc.contributor.advisor Neu, Richard W.
dc.contributor.advisor Cowan, Richard S.
dc.contributor.author Siopis, Matthew James
dc.contributor.committeeMember Streator, Jeffrey L
dc.contributor.committeeMember Bair, Scott S.
dc.contributor.committeeMember Thadhani, Naresh
dc.contributor.department Mechanical Engineering
dc.date.accessioned 2016-05-27T13:09:34Z
dc.date.available 2016-05-27T13:09:34Z
dc.date.created 2015-05
dc.date.issued 2015-01-06
dc.date.submitted May 2015
dc.date.updated 2016-05-27T13:09:34Z
dc.description.abstract Metal 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.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/54854
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Wear
dc.subject Wear mechanisms
dc.subject Wear model
dc.subject Melt lubrication
dc.subject Sliding contact
dc.subject High contact pressures
dc.subject High velocity
dc.subject Aluminum
dc.subject Materials selection
dc.title Wear at high sliding speeds and high contact pressures
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Neu, Richard W.
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 06a1818c-da22-4133-bde7-ad5adc26dab7
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
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