Analysis and Design of Soldering Splice in Superconducting Magnets

2000 ◽  
Author(s):  
Wei Tong ◽  
Zhang Qing Zhuo
Keyword(s):  
High Purity ◽  
Electrical Resistance ◽  
Operating Temperature ◽  
Superconducting Magnets ◽  
Electrical Current ◽  
Element Analysis ◽  
Analysis And Design ◽  
Joint Resistance ◽  
High Purity Aluminum ◽  
Superconducting Cables

Abstract In superconducting magnets, soldering splices are used to connect superconducting cables for providing electrical current paths. One of the main considerations in the splice design is the splice electrical resistance across the joint. High joint resistance can increase the Joule heat generation and thus result in conductor instability. A finite element analysis has been performed to determine the key parameters affecting soldering splice resistance for superconductors with high purity aluminum stabilizers. The parameters investigated include: high purity aluminum RRR value, copper RRR value, solder layer thickness, magnetic field, splice configuration, and operating temperature. The results obtained from this work can benefit splice cooling and the design optimization.

Photopyroelectric Measurement of the Thermal Diffusivity of Recrystallized High Purity Aluminum

1991 ◽  
Vol 3 (1) ◽  
pp. 69-80
Author(s):  
S. B. Peralta ◽  
S. C. Ellis ◽  
C. Christofides ◽  
A. Mandeiis ◽  
H. Sang ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
High Purity ◽  
High Purity Aluminum

DRIVER 180 ALLOY

Alloy Digest ◽  
1978 ◽  
Vol 27 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Alloy ◽  
Electrical Resistance ◽  
Operating Temperature ◽  
Heat Treating ◽  
Specific Resistivity ◽  
Copper Nickel ◽  
Copper Nickel Alloy

Abstract DRIVER 180 ALLOY is a copper-nickel alloy for use where moderate electrical resistance is required. The number designation refers to its specific resistivity (180 ohms/cir mil/ft) which is combined with a fairly low coefficient of resistance (180 x 10^-6 per C). Its maximum recommended operating temperature is 1000 F. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-348. Producer or source: Wilbur B. Driver Company.

DRIVER 90 ALLOY

Alloy Digest ◽  
1977 ◽  
Vol 26 (11) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Alloy ◽  
Electrical Resistance ◽  
Operating Temperature ◽  
Heat Treating ◽  
Specific Resistivity ◽  
Copper Nickel ◽  
Copper Nickel Alloy

Abstract DRIVER 90 ALLOY is a copper-nickel alloy for use where only moderately low electrical resistance is required. The number designations refers to its specific resistivity (90 ohms/cir mil/ft) which is combined with a moderate coefficient of resistance. Its maximum recommended operating temperature is 800 F. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on forming and heat treating. Filing Code: Cu-343. Producer or source: Wilbur B. Driver Company.

A Simplified Design Model for Modular Steel Buildings Subject to Vapor Cloud Explosions (VCEs)

2020 ◽  
Vol 14 ◽  
Author(s):  
Osama Bedair
Keyword(s):  
Dynamic Response ◽  
Minimum Cost ◽  
Design Parameters ◽  
Front Wall ◽  
Steel Buildings ◽  
Element Analysis ◽  
Analysis And Design ◽  
Vapor Cloud ◽  
Building Components ◽  
Analytical Expressions

Background: Modular steel buildings (MSB) are extensively used in petrochemical plants and refineries. Limited guidelines are available in the industry for analysis and design of (MSB) subject to accidental vapor cloud explosions (VCEs). Objectives: The paper presents simplified engineering model for modular steel buildings (MSB) subject to accidental vapor cloud explosions (VCEs) that are extensively used in petrochemical plants and refineries. Method: A Single degree of freedom (SDOF) dynamic model is utilized to simulate the dynamic response of primary building components. Analytical expressions are then provided to compute the dynamic load factors (DLF) for critical building elements. Recommended foundation systems are also proposed to install the modular building with minimum cost. Results: Numerical results are presented to illustrate the dynamic response of (MSB) subject to blast loading. It is shown that (DLF)=1.6 is attained at (td/t)=0.4 for front wall (W1) with (td/T)=1.25. For side walls (DLF)=1.41 and is attained at (td/t)=0.6. Conclusions: The paper presented simplified tools for analysis and design of (MSB) subject accidental vapor cloud blast explosions (VCEs). The analytical expressions can be utilized by practitioners to compute the (MSB) response and identify the design parameters. They are simple to use compared to Finite Element Analysis.

scholarly journals Effect of Applied Pressure on the Electrical Resistance of Carbon Nanotube Fibers

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2106
Author(s):  
Chris J. Barnett ◽  
James D. McGettrick ◽  
Varun Shenoy Gangoli ◽  
Ewa Kazimierska ◽  
Alvin Orbaek White ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Electrical Resistance ◽  
Copper Wire ◽  
Applied Pressure ◽  
Radial Strain ◽  
Electrical Current ◽  
Electrical Contacts ◽  
Electrical Performance ◽  
Macro Scale ◽  
Carbon Nanotube Fibers

Carbon nanotubes (CNTs) can be spun into fibers as potential lightweight replacements for copper in electrical current transmission since lightweight CNT fibers weigh <1/6th that of an equivalently dimensioned copper wire. Experimentally, it has been shown that the electrical resistance of CNT fibers increases with longitudinal strain; however, although fibers may be under radial strain when they are compressed during crimping at contacts for use in electrical current transport, there has been no study of this relationship. Herein, we apply radial stress at the contact to a CNT fiber on both the nano- and macro-scale and measure the changes in fiber and contact resistance. We observed an increase in resistance with increasing pressure on the nanoscale as well as initially on the macro scale, which we attribute to the decreasing of axial CNT…CNT contacts. On the macro scale, the resistance then decreases with increased pressure, which we attribute to improved radial contact due to the closing of voids within the fiber bundle. X-ray photoelectron spectroscopy (XPS) and UV photoelectron spectroscopy (UPS) show that applied pressure on the fiber can damage the π–π bonding, which could also contribute to the increased resistance. As such, care must be taken when applying radial strain on CNT fibers in applications, including crimping for electrical contacts, lest they operate in an unfavorable regime with worse electrical performance.

Anelastic deformation of high purity aluminum at room temperature

1976 ◽  
Vol 10 (2) ◽  
pp. 189-194 ◽  
Author(s):  
Nahum Nir ◽  
Edward W. Hart ◽  
Che-Yu Li
Keyword(s):  
High Purity ◽  
Room Temperature ◽  
High Purity Aluminum ◽  
Anelastic Deformation

scholarly journals Surface segregation of transition elements in high-purity aluminum foil

2005 ◽  
Vol 55 (3) ◽  
pp. 142-146
Author(s):  
Harushige TSUBAKINO ◽  
Yuichiro YAMAMOTO ◽  
Atsushi YAMAMOTO ◽  
Michitaka TERASAWA ◽  
Tohru MITAMURA ◽  
...  
Keyword(s):  
High Purity ◽  
Surface Segregation ◽  
Aluminum Foil ◽  
Transition Elements ◽  
High Purity Aluminum

Migration of grain boundaries and triple junctions in high-purity aluminum during annealing after slight cold rolling

2015 ◽  
Vol 107 ◽  
pp. 134-138 ◽  
Author(s):  
Wenhong Yin ◽  
Weiguo Wang ◽  
Xiaoying Fang ◽  
Congxiang Qin ◽  
Xiaoguang Xing
Keyword(s):  
Cold Rolling ◽  
Grain Boundaries ◽  
High Purity ◽  
Triple Junctions ◽  
High Purity Aluminum
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