Axial and transverse load FEM analysis of CORC cables and wires
Anvar Valiyaparambil Abdulsalam  1, 2, *@  , Keyang Wang  2, 3@  , Md Shahriar Hossain  4, 5@  , Jeremy Weiss  6@  , Danko Van Der Laan  6@  , Arend Nijhuis  2, *@  
1 : Institute for Superconducting and Electronic Materials, University of Wollongong
Northfields Ave, Wollongong NSW 2522, Australie -  Australia
2 : University of Twente [Netherlands]
Drienerlolaan 5, 7522 NB Enschede -  Netherlands
3 : Lanzhou University
222 South Tianshui Road, Lanzhou 730000, Gansu Province, P.R.China -  China
4 : School of Mechanical and Mining Engineering, University of Queensland
University of Queensland Brisbane QLD 4072 Australia -  Australia
5 : University of Wollongong
Northfields Ave, Wollongong NSW 2522, Australie -  Australia
6 : Advanced Conductor Technologies LLC
Boulder, CO 80301 -  United States
* : Corresponding author

Multilayered CORC® wires can carry very high currents in background magnetic fields up to 20 T. Mechanical stresses during operation can result in irreversible degradation in the CORC® wires/cables' performance. Different mechanical loads acting on CORC® cable during production, winding, assembly, and electromagnetic operation are bending, axial and transverse loads. The tape's helical shape around the central core allows tapes to experience only a fraction of the total axial strain applied to the entire cable in the case of tensile loads. The winding angle is the main cabling parameter that influences the tensile strain limit of the CORC® cable. The radial contraction of the tape depends on Poisson's ratio of the central core and winding angle. An analytical model is proposed to estimate the tensile strain in CORC® wires and cables. With optimized cabling parameters, the irreversible strain limit of CORC® cables and wires can be as high as 7%, which is 10 to 12 times higher than the irreversible strain limit of single REBCO tapes. The major mechanical stress in fusion and detector magnets in operation is transverse compressive stress. The transverse stress tolerance of the CORC® cables and wires depends mainly on the gap spacing between layers, uniformity, and thickness of the copper layer in REBCO tape, core material, and surrounding material's hardness. A detailed finite element model is developed to study the effect of both tensile and transverse load in CORC® cables and then compared against experimental data.

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