Fatigue and Fracture Behavior of High Strength and High Conductivity Copper Alloys for High Heat Flux Applications
Li, Meimei
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https://hdl.handle.net/2142/85895
Description
Title
Fatigue and Fracture Behavior of High Strength and High Conductivity Copper Alloys for High Heat Flux Applications
Author(s)
Li, Meimei
Issue Date
2003
Doctoral Committee Chair(s)
Stubbins, James F.
Department of Study
Nuclear Engineering
Discipline
Nuclear Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
The fatigue performance of CuAl25 and CuCrZr and OFHC copper was also evaluated under creep-fatigue loading conditions. It was found that creep and stress relaxation have a major impact on fatigue behavior. Fatigue lives were reduced notably with hold time even at room temperature. Hold times are most damaging at low strain ranges and long fatigue lives. This effect was observed with hold periods as short as 10 seconds. Analysis revealed that the stress relaxation behavior during hold is comparable to transient creep behavior where dislocation glide is the dominant creep deformation mechanism. It was also determined that crack initiation and propagation at grain boundaries was accelerated under creep-fatigue loading conditions.
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