The Vamas Intercomparison in the Area of Superconducting and Cryogenic Structural Materials
The international cooperation on the characterization of relevant properties of superconducting materials and those of cryogenic structural materials necessary for the construction of superconducting equipments are successfully proceeding under the framework of VAMAS intercomparison. The progress and present status of the VAMAS intercomparison are outlined in this paper. Fairly large coefficient of scatter in critical current of Nb3Sn wires was obtained depending on the wire manufacturing process and the measurement conditions. The strain in the specimen was considered to be a major origin of the scatter in critical current. Meanwhile, relatively good agreement was obtained in the round robin test of AC loss measurement of Nb-Ti wires. The results of tensile and fracture toughness testing of SUS 316LN and YUS 170 steels at 4.2K also show rather small scatter. An intercomparison on the electrical strain gauge calibration at cryogenic temperatures has been recently initiated.
KeywordsFracture Toughness Cryogenic Temperature Sample Wire Round Robin Test Fracture Toughness Measurement
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