1、 IEC 61788-19 Edition 1.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 19: Mechanical properties measurement Room temperature tensile test of reacted Nb3Sn composite superconductors Supraconductivit Partie 19: Mesure des proprits mcaniques Essai de traction temprature a
2、mbiante des supraconducteurs composites de Nb3Sn mis en raction IEC61788-19:2013 colourinsideTHIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by an
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16、questions contactez-nous: csciec.ch. IEC 61788-19 Edition 1.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 19: Mechanical properties measurement Room temperature tensile test of reacted Nb3Sn composite superconductors Supraconductivit Partie 19: Mesure des proprits mcan
17、iques Essai de traction temprature ambiante des supraconducteurs composites de Nb3Sn mis en raction INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE X ICS 29.050; 77.040.10 PRICE CODE CODE PRIX ISBN 978-2-8322-1183-0 Registered trademark of the International Elect
18、rotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colourinside 2 61788-19 IEC:2013
19、 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope 8 2 Normative references 8 3 Terms and definitions 8 4 Principles 10 5 Apparatus 10 5.1 General 10 5.2 Testing machine. 10 5.3 Extensometer . 10 6 Specimen preparation 10 6.1 General 10 6.2 Length of specimen 10 6.3 Removing insulation . 11 6.4 Determi
20、nation of cross-sectional area (S0). 11 7 Testing conditions . 11 7.1 Specimen gripping . 11 7.2 Setting of extensometer . 11 7.3 Testing speed 11 7.4 Test . 11 8 Calculation of results . 12 8.1 Modulus of elasticity (E) . 12 8.2 0,2 % proof strength (Rp0,2-0 and Rp0,2-U) 13 9 Uncertainty of measura
21、nd 13 10 Test report . 13 10.1 Specimen . 13 10.2 Results 14 10.3 Test conditions 14 Annex A (informative) Additional information relating to Clauses 1 to 10 16 A.1 Scope 16 A.2 Extensometer . 16 A.2.1 Double extensometer 16 A.2.2 Single extensometer . 17 A.3 Optical extensometers . 18 A.4 Requireme
22、nts of high resolution extensometers . 19 A.5 Tensile stress Relasticmaxand strain Aelasticmax20 A.6 Functional fitting of stress-strain curve obtained by single extensometer and 0,2 % proof strength (Rp0,2-F) 21 A.7 Removing insulation . 22 A.8 Cross-sectional area determination 22 A.9 Fixing of th
23、e reacted Nb3Sn wire to the machine by two gripping techniques . 22 A.10 Tensile strength (Rm) 23 A.11 Percentage elongation after fracture (A) 24 A.12 Relative standard uncertainty . 24 A.13 Determination of modulus of elasticity E0. 26 61788-19 IEC:2013 3 A.14 Assessment on the reliability of the
24、test equipment 27 A.15 Reference documents 27 Annex B (informative) Uncertainty considerations 28 B.1 Overview 28 B.2 Definitions 28 B.3 Consideration of the uncertainty concept . 28 B.4 Uncertainty evaluation example for TC 90 standards 30 B.5 Reference documents of Annex B . 31 Annex C (informativ
25、e) Specific examples related to mechanical tests 33 C.1 Overview 33 C.2 Uncertainty of the modulus of elasticity 33 C.3 Evaluation of sensitivity coefficients . 34 C.4 Combined standard uncertainties of each variable . 35 C.5 Uncertainty of 0,2 % proof strength Rp0,238 Bibliography 43 Figure 1 Stres
26、s-strain curve and definition of modulus of elasticity and 0,2 % proof strengths for Cu/Nb3Sn wire . 15 Figure A.1 Light weight ultra small twin type extensometer 16 Figure A.2 Low mass averaging double extensometer 17 Figure A.3 An example of the extensometer provided with balance weight and vertic
27、al specimen axis . 18 Figure A.4 Double beam laser extensometer 19 Figure A.5 Load versus displacement record of a reacted Nb3Sn wire . 20 Figure A.6 Stress-strain curve of a reacted Nb3Sn wire . 21 Figure A.7 Two alternatives for the gripping technique. 23 Figure A.8 Details of the two alternatives
28、 of the wire fixing to the machine . 23 Figure C.1 Measured stress-strain curve 33 Figure C.2 Stress-strain curve . 39 Table A.1 Standard uncertainty value results achieved on different Nb3Sn wires during the international round robin tests 25 Table A.2 Results of ANOVA (F-test) for the variations o
29、f E0. 26 Table B.1 Output signals from two nominally identical extensometers 29 Table B.2 Mean values of two output signals . 29 Table B.3 Experimental standard deviations of two output signals 29 Table B.4 Standard uncertainties of two output signals 30 Table B.5 Coefficient of Variations of two ou
30、tput signals 30 Table C.1 Load cell specifications according to manufacturers data sheet. 35 Table C.2 Uncertainties of displacement measurement 36 Table C.3 Uncertainties of wire diameter measurement 37 Table C.4 Uncertainties of gauge length measurement 37 Table C.5 Calculation of stress at 0 % an
31、d at 0,1 % strain using the zero offset regression line as determined in Figure C.1 (b) . 38 Table C.6 Linear regression equations computed for the three shifted lines and for the stress strain curve in the region where the lines intersect 40 4 61788-19 IEC:2013 Table C.7 Calculation of strain and s
32、tress at the intersections of the three shifted lines with the stress strain curve 40 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 41 61788-19 IEC:2013 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SUPERCONDUCTIVITY
33、Part 19: Mechanical properties measurement Room temperature tensile test of reacted Nb3Sn composite superconductors FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Commit
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44、l Standard IEC 61788-19 has been prepared by IEC technical committee 90: Superconductivity. The text of this standard is based on the following documents: FDIS Report on voting 90/328/FDIS 90/330/RVD Full information on the voting for the approval of this standard can be found in the report on votin
45、g indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 61788 series, published under the general title Superconductivity, can be found on the IEC website. 6 61788-19 IEC:2013 The committee has decided that t
46、he contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTA
47、NT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 61788-19 IEC:2013 7 INTRODUCTION The Cu/Nb3Sn superco
48、nductive composite wires are multifilamentary composite materials. They are manufactured in different ways. The first method is the bronze route, where fine Nb / Nb alloy filaments are embedded in a bronze matrix, a barrier and a copper stabilizer. The second is the internal-tin method, where fine m
49、ultifilaments are composed with copper matrix including Sn reservoirs, a barrier, and a copper stabilizer. The third is the powder-in-tube method, where Nb / Nb alloy tubes are filled with Sn rich powders and are embedded in a Cu stabilizing matrix. Common to all types of Nb3Sn composite wires is that the superconducting A15 phase Nb3Sn has been formed at final wire dime
