CEI EN 61788-18 PDF

This International Standard 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 (see Clauses A.4, A.5, A.6 and A.10).

The sample covered by this test procedure should have a round or rectangular cross-section with an area of 0,3 mm² to 2,0 mm² (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).