Abstract
Nb 3 Sn superconducting wires are very important for superconducting magnets generating high fields of more than 10 T. From the viewpoint of practical use, one of the serious problems for Nb 3Sn wires is enumerated that their superconducting properties are sensitively deteriorated due to the applied strain, when a large electromagnetic force is added to the high field superconducting magnet. Recent experimental results suggest that the three-dimensional strain state has to be evaluated to understand the strain dependence of superconducting properties for Nb 3 Sn wires. In this article, the strain effects for Nb 3 Sn wiresin high magnetic fields are introduced. The physical background and a three-dimensional strain model for the strain effect on Nb 3 Sn wires are explained in order to understand the strain dependence of superconducting properties for Nb 3Sn.
