Title:
A Finite Element Fretting Analysis of Cylindrical and Spherical Contacts at Room and High Temperatures

dc.contributor.advisor Green, Itzhak
dc.contributor.author Yang, Huaidong
dc.contributor.committeeMember Neu, Richard W.
dc.contributor.committeeMember Streator, Jeffrey L.
dc.contributor.committeeMember Jackson, Robert L.
dc.contributor.committeeMember Varenberg, Michael
dc.contributor.department Mechanical Engineering
dc.date.accessioned 2021-01-11T17:10:29Z
dc.date.available 2021-01-11T17:10:29Z
dc.date.created 2020-12
dc.date.issued 2020-11-05
dc.date.submitted December 2020
dc.date.updated 2021-01-11T17:10:29Z
dc.description.abstract Fretting can be considered as a small amplitude cyclic relative motion. Nuclear reactors are designed to operate at high temperatures as it results in substantial improvements of thermal efficiency. The structural and in-core components of a high/very high temperature gas cooled reactors (HTGR/VHTRs) are exposed to this high temperature environment. In components such as valve stems and seats, control rod drive mechanisms, fuel handling mechanisms, and helium circulators, fretting wear and fretting fatigue can significantly reduce the operational lifetime of these components. Inconel 617 and Incoloy 800H are nickel-based alloys, commonly used materials in HTGR/VHTRs. These alloys possess excellent high temperature corrosion, strength, and oxidation resistance properties. The fretting contact behaviors between these two alloys in room and high temperatures are investigated to obtain fundamental knowledge of fretting wear and fretting fatigue mechanisms. The purpose of this work is to understand the physical phenomena of the fretting system. It is desirable to model a numerical model for the fretting system and do the stress strain analysis at and under the contacting interface, which helped understand the mechanisms of fretting wear and fretting fatigue. It is also desirable to develop analytical and semi-analytical solutions for fretting wear volume, which helped understand the relation between wear volume, normal load, amplitude, and material properties during the fretting motion. The understanding of the physical phenomena of fretting, in turn, may lead to mitigation methods which alleviate the fretting damage. Thus, the objective of this research is to model the fretting system, identify its physical phenomena, and propose mitigation methods to reduce the fretting damage.
dc.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/64133
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Fretting
dc.subject Finite element
dc.subject Wear
dc.subject Adhesion
dc.title A Finite Element Fretting Analysis of Cylindrical and Spherical Contacts at Room and High Temperatures
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Green, Itzhak
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication ebbbb6be-1459-4e33-932f-a86c2218e26a
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
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