Fatigue and Fracture Behavior of High Strength and High Conductivity Copper Alloys for High Heat Flux Applications

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Nuclear Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Li, Meimei

Contributors dc:contributor

• Stubbins, James F.

• Engineering, Materials Science

Language dc:language

eng

Identifier

(MiAaPQ)AAI3086117

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/85895