Modeling creep and fatigue of copper alloys

Li, G.; Thomas, Brian G.; Stubbins, James F.

doi:10.1007/s11661-000-0194-z

Cited by 119 publications

(50 citation statements)

References 23 publications

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“…Nadkarni 51 Li et al 31 summarized steady-state thermal creep data for pure copper and several copper alloys, as shown in Figure 5. Pure copper can suffer significant creep deformation at high temperature even with a very low applied stress.…”

Section: Creepmentioning

confidence: 99%

Physical and Mechanical Properties of Copper and Copper Alloys

Li¹,

Zinkle²

2012

Comprehensive Nuclear Materials

173

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Section: Creepmentioning

confidence: 99%

Physical and Mechanical Properties of Copper and Copper Alloys

Li¹,

Zinkle²

2012

Comprehensive Nuclear Materials

173

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“…Building on the early work of Brimacombe [37] , 3-D finite-element models of thermal distortion can now be extended to predict crack formation, including creep and plastic strain accumulated over many fatigue cycles [38][39][40] . An important application is the study of surface cracks in the copper plates near the meniscus of thin slab casting molds.…”

Section: Mold Thermal Fatigue Analysismentioning

confidence: 99%

Modeling of the continuous casting of steel—past, present, and future

Thomas¹

2002

Metall Mater Trans B

134

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This lecture honoring Keith Brimacombe looks over the history, current abilities, and future potential of mathematical models to improve understanding and to help solve practical problems in the continuous casting of steel. Early finite-difference models of solidification, which were pioneered by Keith Brimacombe and his students, form the basis for the online dynamic models used to control spray water flow in a modern slab caster. Computational thermal-stress models, also pioneered by Brimacombe, have led to improved understanding of mold distortion, crack formation, and other phenomena. This has enabled process improvements, such as optimized mold geometry and spray cooling design. Today, sophisticated models such as transient and multiphase fluid flow rival water modeling in providing insights into flow-related defects. Heat flow and stress models have also advanced to yield new insights. As computer power increases and improvements via empirical plant trials become more costly, models will likely play an increasing role in future developments of complex mature processes, such as continuous casting. FORWARDIt is a great privilege to present the second ever J. Keith Brimacombe lecture at this first Electric Furnace Conference of the Third Millennium, (at least according to the Gregorian calendar). Professor Brimacombe was a giant in many fields. He also inspired many people, especially his students, including me. At the first Brimacombe lecture, last year, Indira Samarasekera [1] , gave an inspirational talk, that touched on many different facets of the research excellence that was the hallmark of this remarkable man's career. Dr. Brimacombe left a legacy of leadership, knowledge and genuine care for the people, which benefited the steel industry, the Iron and Steel Society, and many individuals here today. His technical contributions spanned a B.G. Thomas, Brimacombe Lecture,59 th Electric Furnace Conf., Pheonix, AZ, 2001, Iron & Steel Soc., pp. 3-30 4 wide range of materials engineering processes, including rotary kilns, injection, bath smelting, flash smelting, static and continuous casting, rolling, and microstructural engineering.This year's lecture will look at the history, current state, and future prospects of the mathematical modeling of the continuous casting of steel. Of the many contributions that Dr. Brimacombe gave to process metallurgy, some of his best pioneering work was done to help create this field. He was a champion of modeling and he did much to improve its credibility and usefulness, through his example. This subject is also fitting because his impact on the steel industry through short courses and publications on continuous casting made extensive use of the landmark results of his models. Indeed, he would have been the best choice to lecture on this topic, had he not suddenly left us in 1997. I am grateful to the organizers for asking me to give this lecture in an effort to continue his spirit.

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“…After these iterations and a series of thermal and mechanical simulations, we found the best cooling channels configuration that produces an acceptable operating temperature with minimal von Mises stresses, which are at least 3 times less than the yield stress of copper [18], as well as deformation and frequency shift less than 10% of the tuning range. The details and corresponding results for the different iterations are given in Table V.…”

Section: B Optimization Of Cooling Channelsmentioning

confidence: 99%

Design and multiphysics analysis of a 176 MHz continuous-wave radio-frequency quadrupole

Kutsaev

Mustapha

Ostroumov

et al. 2014

Phys. Rev. ST Accel. Beams

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We have developed a new design for a 176 MHz cw radio-frequency quadrupole (RFQ) for the SARAF upgrade project. At this frequency, the proposed design is a conventional four-vane structure. The main design goals are to provide the highest possible shunt impedance while limiting the required rf power to about 120 kW for reliable cw operation, and the length to about 4 meters. If built as designed, the proposed RFQ will be the first four-vane cw RFQ built as a single cavity (no resonant coupling required) that does not require π-mode stabilizing loops or dipole rods. For this, we rely on very detailed 3D simulations of all aspects of the structure and the level of machining precision achieved on the recently developed ATLAS upgrade RFQ. A full 3D model of the structure including vane modulation was developed. The design was optimized using electromagnetic and multiphysics simulations. Following the choice of the vane type and geometry, the vane undercuts were optimized to produce a flat field along the structure. The final design has good mode separation and should not need dipole rods if built as designed, but their effect was studied in the case of manufacturing errors. The tuners were also designed and optimized to tune the main mode without affecting the field flatness. Following the electromagnetic (EM) design optimization, a multiphysics engineering analysis of the structure was performed. The multiphysics analysis is a coupled electromagnetic, thermal and mechanical analysis. The cooling channels, including their paths and sizes, were optimized based on the limiting temperature and deformation requirements. The frequency sensitivity to the RFQ body and vane cooling water temperatures was carefully studied in order to use it for frequency fine-tuning. Finally, an inductive rf power coupler design based on the ATLAS RFQ coupler was developed and simulated. The EM design optimization was performed using CST MICROWAVE STUDIO and the results were verified using both HFSS and ANSYS. The engineering analysis was performed using HFSS and ANSYS and most of the results were verified using the newly developed CST MULTIPHYSICS package.

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Modeling creep and fatigue of copper alloys

Cited by 119 publications

References 23 publications

Physical and Mechanical Properties of Copper and Copper Alloys

Physical and Mechanical Properties of Copper and Copper Alloys

Modeling of the continuous casting of steel—past, present, and future

Design and multiphysics analysis of a 176 MHz continuous-wave radio-frequency quadrupole

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