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Torsion tests of filamentary Nb/CuSn and BSCCO/Ag composite wires

Filamentary Nb/CuSn and BSCCO/Ag wires have been tested by torsion to allow analysis of their stress–strain behaviour and twisting limitations as well. The samples’ length changes (ΔLs) versus the number of torsion turns (ΔLs(Nt)) have been measured at constant tension applied in the wire axis. The results obtained for variably heat-treated Nb/CuSn and various filament number/architecture BSCCO/Ag composite wires are analysed. The ΔLs(Nt) curves contain several characteristic parts (region of elongation, constant length and wire contraction) reflecting sensitively the mechanical properties of the individual composite elements as well as their volume fraction. The presented results allow better understanding of how the composite elements used influence the strength of composite wires and their twisting limitations and also offer the possibility of testing simply the wires’ homogeneity.