BS EN 61788-18:2013

1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Specimen preparation
7 Testing conditions
8 Calculation of results
9 Uncertainty of measurement
10 Test report
Annex A (informative) - Additional information
        relating to Clauses 1 to 14
Annex B (informative) - Uncertainty considerations
Annex C (informative) - Specific examples related
        to evaluation of uncertainties for
        Ag/Bi-2223 and Ag/Bi-2212 wires
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Describes a test method detailing the tensile test procedures to be carried out on Ag/Bi-2223 and Ag/Bi-2212 superconductive composite wires at room temperature.

IEC 61788-18:2013 specifies a test method detailing the tensile test procedures to be carried out on Ag/Bi-2223 and Ag/Bi-2212 superconductive composite wires at room temperature. This test is used to measure the modulus of elasticity and to determine the 0,2 % proof strength. When the 0,2 % proof strength could not be determined due to earlier failure, the stress level at apparent strains of 0,05 %, 0,1 %, 0,15 %, 0,2 %, 0,25 % with increment of 0,05 % is measured. The values for elastic limit, fracture strength, percentage elongation after fracture and the fitted type of 0,2 % proof strength serve only as a reference. The sample covered by this test procedure should have a round or rectangular cross-section with an area of 0,3 mm ² to 2,0 mm ² (corresponding to the tape-shaped wires with width of 2,0 mm to 5,0 mm and thickness of 0,16 mm to 0,4 mm). Key words: superconductivity, mechanical properties measurement