Impact Factor:1.8
DOI number:10.1016/j.cryogenics.2022.103617
Journal:Cryogenics
Place of Publication:英国
Key Words:Numerical Model, Transverse Current Transport, Multi-filament Twisting Strands
Abstract:This paper establishes a three-dimensional finite element model for multi-filament twisting strands. The model studies the changes in its transverse transport properties by applying uniform axial loads. The electro-mechanical coupling relation of superconducting filaments is established by the scaling law and n-power relation. When the average strain of the filaments is between 0.1% and 0.2%, the equivalent conductivity of filaments almost decreases linearly by 67.7% with respect to that for zero-strain. Meanwhile, the contact resistance Rc increases quadratically with the strain, the value of Rc=3.9×10-15Ωm2 is calculated at strain 0.2% and n=6, and reaches the same order of magnitude as the previous work. As n increases from 6 to 10, the contact resistance increases sharply by 104 order of magnitude in unit of Ω∙m2. It is indicated that the contact resistance is sensitive to the n value. By gradually increasing the number of filaments in a strand model, the average potential difference decreases in a nearly linear manner, and the minimum value of 9.9×10-11V is found for the strand of 36 filaments at 0.2% strain. It suggests that filaments improve the capacity of transverse transport. Besides, the average transverse current density of the strand is suppressed by the strain, its value decreasing from 800A/m2 at zero strain to 570A/m2 at 0.2% strain. It is shown that its capability to carry transverse current is declined under strain.
Indexed by:SCI
Discipline:Science
Volume:129
Issue:11
Page Number:103617
Number of Words:5000
ISSN No.:0011-2275
Translation or Not:no
Date of Publication:2022-12-01