Result: Three-directional FEM analyses of pre-bending effects for Nb3Sn composite wires
IMR, Tohoku University, Sendai 980-8577, Japan
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
CC BY 4.0
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Electronics
Further Information
Pre-bending effects of Nb3SD composite wires, enhancement in Jc at the as-cooled condition and Jc peak, Jcm, against applied tensile strain, are well known in especially Cu-Nb reinforced Cu stabilized Nb3Sn wire. In an attempt to understand the effects, three directional strain analyses using FEM were studied by considering thermally-induced residual strain due to temperature difference between the reaction temperature and the cryogenic temperatures including the pre-bending process at room temperature for three types of Nb3Sn composite wires. To evaluate effects of change in three directional strain, the von Mises strain was introduced. As a result, the minimum von Mises strain against the applied tensile strain corresponded to Jcm; low strain shows Jcm enhancement by the pre-bending for Cu-Nb reinforced Nb3 S n wire. It was found that there is a direct correlation between the minimum von Mises strain and Jcm related to the pre-bending.