Process mechanics and surface integrity of low plasticity burnishing of SE508 Nitinol alloy

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dc.contributor Weaver, Mark Lovell
dc.contributor Jordon, J. Brian
dc.contributor.advisor Guo, Yuebin B. McKinney, John Ellis 2017-04-26T14:22:29Z 2017-04-26T14:22:29Z 2013
dc.identifier.other u0015_0000001_0001247
dc.identifier.other McKinney_alatus_0004M_11450
dc.description Electronic Thesis or Dissertation
dc.description.abstract Superelastic Nitinol and shape memory alloys have attracted growing attentions over the recent years in the areas of biomedical and aerospace applications. Surface integrity of Nitinol devices by various fabrication processes is critical for their functionality and performance. Low plasticity burnishing (LPB) is a surface enhancement process to improve surface integrity due to its unique capability to plastically deform material in the deep subsurface on the order of a 500-1000ìm. This thesis focuses on the dynamic mechanical behavior of SE508 Nitinol (NiTi) alloy and process mechanics and surface integrity by ball burnishing of the material. The stress-strain behaviors of SE508 NiTi alloy at quasi-static and high strain rates were experimentally determined using a series of compression testing. Then, the experimentally determined stress-strain behavior was used in correlation with Hertzian theory of contact mechanics in ball burnishing of the material. It was found that quasi-static compressive stress-strain behavior correlates well with Hertzian peak pressure. This serves as a basis to select burnishing loads. The effects of LPB parameters, i.e. burnishing pressure, feed, speed, number of path, and pattern on surface integrity characteristics such as surface topography, roughness, microhardness, and microstructure are investigated.
dc.format.extent 107 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Mechanical engineering
dc.subject.other Mechanics
dc.subject.other Materials Science
dc.title Process mechanics and surface integrity of low plasticity burnishing of SE508 Nitinol alloy
dc.type thesis
dc.type text University of Alabama. Dept. of Mechanical Engineering Mechanical Engineering The University of Alabama master's M.S.

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