An international RRT has been carried out in order to establish the test method for mechanical properties of
commercial Nb3Sn
superconductive wires under the cooperation of eleven worldwide research groups. From the
stress–strain curve, the following quantities were evaluated; modulus of elasticity, transition
of elastic to plastic deformation, proof strength, tensile strength and elongation to fracture.
The scatter of measured values was analyzed to evaluate the COV, which is the standard
deviation divided by the average. The results made clear how the experimental conditions
influence the determination of physical quantities. The most important point is
that large COVs for modulus of elasticity and proof strength from the initial
slope are caused by the narrow elastic limit. Methods have been discussed to
improve the statistics of experimental results obtained from the international RRT.
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