Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
BS EN 61788-19:2014

BS EN 61788-19:2014

$189.07

Superconductivity – Mechanical properties measurement. Room temperature tensile test of reacted Nb3Sn composite superconductors

Published By Publication Date Number of Pages
BSI 2014 48
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Categories: ,

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

IEC 61788-19:2013 covers a test method detailing the tensile test procedures to be carried out on reacted Cu/Nb3Sn composite superconducting wires at room temperature. The object of this test is to measure the modulus of elasticity and to determine the proof strength of the composite due to yielding of the copper and the copper tin components from the stress versus strain curve. Furthermore, the elastic limit, the tensile strength, and the elongation after fracture can be determined by means of the present method, but they are treated as optional quantities because the measured quantities of the elastic limit and the elongation after fracture have been reported to be subject to significant uncertainties according to the international round robin test. The sample covered by this test procedure should have a bare round or rectangular cross-section with an area between 0,15 mm2 and 2,0 mm2 and a copper to non-copper volume ratio of 0,2 to 1,5 and should have no insulation. Key words: supraconductivity, mechanical properties

PDF Catalog

PDF Pages PDF Title
6 English
CONTENTS
9 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms and definitions
12 4 Principles
5 Apparatus
5.1 General
5.2 Testing machine
5.3 Extensometer
6 Specimen preparation
6.1 General
6.2 Length of specimen
13 6.3 Removing insulation
6.4 Determination of cross-sectional area (S0)
7 Testing conditions
7.1 Specimen gripping
7.2 Setting of extensometer
7.3 Testing speed
7.4 Test
14 8 Calculation of results
8.1 Modulus of elasticity (E)
15 8.2 0,2 % proof strength (Rp0,2-0 and Rp0,2-U)
9 Uncertainty of measurand
10 Test report
10.1 Specimen
16 10.2 Results
10.3 Test conditions
17 Figures
Figure 1 – Stress-strain curve and definition of modulus of elasticity and 0,2 % proof strengths for Cu/Nb3Sn wire
18 Annex A (informative) Additional information relating to Clauses 1 to 10
A.1 Scope
A.2 Extensometer
A.2.1 Double extensometer
Figure A.1 – Light weight ultra small twin type extensometer
19 A.2.2 Single extensometer
Figure A.2 – Low mass averaging double extensometer
20 A.3 Optical extensometers
Figure A.3 – An example of the extensometer provided with balance weight and vertical specimen axis
21 A.4 Requirements of high resolution extensometers
Figure A.4 – Double beam laser extensometer
22 A.5 Tensile stress Relasticmax and strain Aelasticmax
Figure A.5 – Load versus displacement record of a reacted Nb3Sn wire
23 A.6 Functional fitting of stress-strain curve obtained by single extensometer and 0,2 % proof strength (Rp0,2-F)
Figure A.6 – Stress-strain curve of a reacted Nb3Sn wire
24 A.7 Removing insulation
A.8 Cross-sectional area determination
A.9 Fixing of the reacted Nb3Sn wire to the machine by two gripping techniques
25 A.10 Tensile strength (Rm)
Figure A.7 – Two alternatives for the gripping technique.
Figure A.8 – Details of the two alternatives of the wire fixing to the machine
26 A.11 Percentage elongation after fracture (Af)
A.12 Relative standard uncertainty
27 Tables
Table A.1 – Standard uncertainty value results achieved ondifferent Nb3Sn wires during the international round robin tests
28 A.13 Determination of modulus of elasticity E0
Table A.2 – Results of ANOVA (F-test) for the variations of E0
29 A.14 Assessment on the reliability of the test equipment
A.15 Reference documents
30 Annex B (informative) Uncertainty considerations
B.1 Overview
B.2 Definitions
B.3 Consideration of the uncertainty concept
31 Table B.1 – Output signals from two nominally identical extensometers
Table B.2 – Mean values of two output signals
Table B.3 – Experimental standard deviations of two output signals
32 B.4 Uncertainty evaluation example for TC 90 standards
Table B.4 – Standard uncertainties of two output signals
Table B.5 – Coefficient of Variations of two output signals
33 B.5 Reference documents of Annex B
35 Annex C (informative) Specific examples related to mechanical tests
C.1 Overview
C.2 Uncertainty of the modulus of elasticity
Figure C.1 – Measured stress-strain curve
36 C.3 Evaluation of sensitivity coefficients
37 C.4 Combined standard uncertainties of each variable
Table C.1 – Load cell specifications according to manufacturer’s data sheet
38 Table C.2 – Uncertainties of displacement measurement
39 Table C.3 – Uncertainties of wire diameter measurement
Table C.4 – Uncertainties of gauge length measurement
40 C.5 Uncertainty of 0,2 % proof strength Rp0,2
Table C.5 – Calculation of stress at 0 % and at 0,1 % strain using the zero offset regression line as determined in Figure C.1 (b)
41 Figure C.2 – Stress-strain curve
42 Table C.6 – Linear regression equations computed for the three shifted linesand for the stress–strain curve in the region where the lines intersect
Table C.7 – Calculation of strain and stress at the intersections of the three shifted lines with the stress–strain curve
43 Table C.8 – Measured stress versus strain data and the computed stress based on a linear fit to the data in the region of interest
45 Bibliography

Related products

BS EN 61788-19:2014
$189.07