1、 IEC 61788-18 Edition 1.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 18: Mechanical properties measurement Room temperature tensile test of Ag- and/or Ag alloy-sheathed Bi-2223 and Bi-2212 composite superconductors Supraconductivit Partie 18: Mesure des proprits mcani
2、ques Essai de traction temprature ambiante des supraconducteurs composites Bi-2223 et Bi-2212 avec gaine Ag et/ou en alliage dAg IEC 61788-18:2013 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publicat
3、ion may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enq
4、uiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelqu
5、e forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur c
6、ette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI de votre pays de rsidence. IEC Central Office Tel.: +41 22 919 02 11 3, rue de Varemb Fax: +41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical
7、Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have t
8、he latest edition, a corrigenda or an amendment might have been published. Useful links: IEC publications search - www.iec.ch/searchpub The advanced search enables you to find IEC publications by a variety of criteria (reference number, text, technical committee,). It also gives information on proje
9、cts, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published details all new publications released. Available on-line and also once a month by email. Electropedia - www.electropedia.org The worlds leading onl
10、ine dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary (IEV) on-line. Customer Service Centre - webstore.iec.ch/csc If you wi
11、sh to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et publie des Normes internationales pour tout ce
12、qui a trait llectricit, llectronique et aux technologies apparentes. A propos des publications CEI Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Liens utiles: Reche
13、rche de publications CEI - www.iec.ch/searchpub La recherche avance vous permet de trouver des publications CEI en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Elle donne aussi des informations sur les projets et les publications remplaces ou retires. Just Published CEI - we
14、bstore.iec.ch/justpublished Restez inform sur les nouvelles publications de la CEI. Just Published dtaille les nouvelles publications parues. Disponible en ligne et aussi une fois par mois par email. Electropedia - www.electropedia.org Le premier dictionnaire en ligne au monde de termes lectroniques
15、 et lectriques. Il contient plus de 30 000 termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International (VEI) en ligne. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des c
16、ommentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61788-18 Edition 1.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 18: Mechanical properties measurement Room temperature tensile test of Ag- and/or Ag alloy-sheathed Bi-2223 a
17、nd Bi-2212 composite superconductors Supraconductivit Partie 18: Mesure des proprits mcaniques Essai de traction temprature ambiante des supraconducteurs composites Bi-2223 et Bi-2212 avec gaine Ag et/ou en alliage dAg INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATION
18、ALE W ICS 29.050 PRICE CODE CODE PRIX ISBN 978-2-8322-1051-2 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez v
19、ous assurer que vous avez obtenu cette publication via un distributeur agr. 2 61788-18 IEC:2013 CONTENTS 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 7 4 Principle . 9 5 Apparatus . 9 5.1 General . 9 5.2 Testing machine 9 5.3 Extensometer 9 6 Specimen preparation . 9 6.1 General
20、. 9 6.2 Length of specimen . 10 6.3 Removing insulation 10 6.4 Determination of cross-sectional area (S 0 ) 10 7 Testing conditions 10 7.1 Specimen gripping . 10 7.2 Setting of extensometer . 10 7.3 Testing speed 10 7.4 Test . 10 8 Calculation of results 12 8.1 Modulus of elasticity (E) 12 8.2 0,2 %
21、 proof strength (R p 0,2 ) 13 8.3 Tensile stress at specified strains (R A ) 13 8.4 Fracture strength (R f ) 14 9 Uncertainty of measurement . 14 10 Test report 14 10.1 Specimen 14 10.2 Results 15 10.3 Test conditions 15 Annex A (informative) Additional information relating to Clauses 1 to 14 16 Ann
22、ex B (informative) Uncertainty considerations 26 Annex C (informative) Specific examples related to evaluation of uncertainties for Ag/Bi-2223 and Ag/Bi-2212 wires . 30 Figure 1 Typical stress-strain curve and definition of modulus of elasticity and 0,2 % proof strengths of an externally laminated A
23、g/Bi-2223 wire by brass foil . 11 Figure 2 Typical stress-strain curve of an Ag/Bi-2223 wire where the 0,2 % proof strengths could not be determined and definition of tensile stresses at specified strains . 12 Figure A.1 Low mass Siam twin type extensometer with a gauge length of 12,3 mm (total mass
24、 0,5 g) . 16 Figure A.2 Low mass double extensometer with a gauge length of 25,6 mm (total mass 3 g) . 17 Figure A.3 An example of the extensometer provided with balance weight and vertical specimen axis . 18 Figure A.4 Original raw data of an Ag/Bi-2223 wire measurement in form of load and displace
25、ment graph . 19 61788-18 IEC:2013 3 Figure A.5 Typical stress versus strain of an Ag/Bi-2223 wire up to the elastic limit corresponding to the transition region from elastic to plastic deformation (point G) . 20 Figure C.1 Measured stress versus strain curve for Bi-2223 wire . 31 Table A.1 Results o
26、f relative standard uncertainty values achieved on different Ag/Bi-2223 wires during the international round robin tests . 23 Table A.2 Selected data for F test for E 0 of Sample E bare wire 24 Table A.3 Results of F-test for the variations of E 0of four kinds of Bi-2223 wires 24 Table B.1 Output si
27、gnals from two nominally identical extensometers 27 Table B.2 Mean values of two output signals . 27 Table B.3 Experimental standard deviations of two output signals 27 Table B.4 Standard uncertainties of two output signals 27 Table B.5 Coefficient of variations of two output signals . 28 Table C.1.
28、 Load cell specifications according to manufacturers data sheet 32 Table C.2 Uncertainties from various factors for stress measurement 33 Table C.3 Uncertainties with respect to measurement of strain measurement 35 Table C.4 Summary of evaluated uncertainties caused by various factors 35 Table C.5 R
29、esults of uncertainty evaluation for the modulus of elasticity (E 0= 86,1 GPa) as a function of initial cross head rate 36 Table C.6 Uncertainties from various factors for stress measurement 37 Table C.7 Results of uncertainty evaluation for the stress (R = 42,5 MPa) as a function of initial strain
30、rate 37 4 61788-18 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SUPERCONDUCTIVITY Part 18: Mechanical properties measurement Room temperature tensile test of Ag- and/or Ag alloy-sheathed Bi-2223 and Bi-2212 composite superconductors FOREWORD 1) The International Electrotechnical Commission (
31、IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addit
32、ion to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interest
33、ed in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with
34、conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC
35、 National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for t
36、he way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between an
37、y IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformi
38、ty. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members
39、of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or an
40、y other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may b
41、e the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61788-18 has been prepared by IEC technical committee 90: Superconductivity. The text of this standard is based on the following documents: FDIS Report on votin
42、g 90/326/FDIS 90/327/RVD Full information on the voting for the approval of this standard can be found in the report on voting 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 und
43、er the general title Superconductivity, can be found on the IEC website. 61788-18 IEC:2013 5 The committee has decided that the 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
44、publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 61788-18 IEC:2013 INTRODUCTION Several types of composite superconductors have now been commercialised. Especially, high temperature superconductors such as Ag- and/or Ag alloy-she
45、athed Bi-2223 (Ag/Bi-2223) and Ag- and/or Ag alloy-sheathed Bi-2212 (Ag/Bi-2212) wires are now manufactured in industrial scale. Commercial composite superconductors have a high current density and a small cross-sectional area. The major applications of composite superconductors are to build electri
46、cal power devices and superconducting magnets. While the magnet is being manufactured, complicated stresses/strains are applied to its windings and, while it is being energized, a large electromagnetic force is applied to the superconducting wires because of its high current density. It is therefore
47、 indispensable to determine the mechanical properties of the superconductive wires from which the windings are made. The Ag/Bi-2223 and Ag/Bi-2212 superconductive composite wires fabricated by the powder-in -tube method are composed of a number of oxide filaments with silver and silver alloy as a st
48、abilizer and supporter. In the case that the external reinforcement of Ag/Bi-2223 and Ag/Bi-2212 wires by using thin stainless or Cu alloy foils has been adopted in order to resist the large electromagnet force, this standard shall be also applied. 61788-18 IEC:2013 7 SUPERCONDUCTIVITY Part 18: Mech
49、anical properties measurement Room temperature tensile test of Ag- and/or Ag alloy-sheathed Bi-2223 and Bi-2212 composite superconductors 1 Scope 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 modu