1、 IEC 61788-6 Edition 3.0 2011-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 6: Mechanical properties measurement Room temperature tensile test of Cu/Nb-Ti composite superconductors Supraconductivit Partie 6: Mesure des proprits mcaniques Essai de traction temprature ambiante
2、des supraconducteurs composites de Cu/Nb-Ti IEC 61788-6:2011 colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electroni
3、c 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 enquiry about obtaining additional rights to this publication, please conta
4、ct 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 quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compr
5、is 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 cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit
6、national de la CEI de votre pays de rsidence. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards
7、 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 the latest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publication
8、s: www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, withdrawn and replaced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new I
9、EC publications. Just Published details twice a month all new publications released. Available on-line and also by email. Electropedia: www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French
10、, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary online. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ
11、 or contact us: Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 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 qui a trait llectricit, llectronique et aux technolog
12、ies 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. Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm
13、 Le Catalogue en-ligne de la CEI vous permet deffectuer des recherches en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Il donne aussi des informations sur les projets et les publications retires ou remplaces. Just Published CEI: www.iec.ch/online_news/justpub Restez inform s
14、ur les nouvelles publications de la CEI. Just Published dtaille deux fois par mois les nouvelles publications parues. Disponible en-ligne et aussi par email. Electropedia: www.electropedia.org Le premier dictionnaire en ligne au monde de termes lectroniques et lectriques. Il contient plus de 20 000
15、termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International en ligne. Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm Si vous dsirez nous donner des commentaires sur cett
16、e publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61788-6 Edition 3.0 2011-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 6: Mechanical properties measurement Room
17、temperature tensile test of Cu/Nb-Ti composite superconductors Supraconductivit Partie 6: Mesure des proprits mcaniques Essai de traction temprature ambiante des supraconducteurs composites de Cu/Nb-Ti INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE V ICS 29.050;
18、 77.040.10 PRICE CODE CODE PRIX ISBN 978-2-88912-580-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale colour inside 2 61788-6 IEC:2011 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3
19、Terms and definitions . 7 4 Principle . 8 5 Apparatus . 8 5.1 Conformity . 8 5.2 Testing machine 8 5.3 Extensometer 9 6 Specimen preparation. 9 6.1 Straightening the specimen . 9 6.2 Length of specimen . 9 6.3 Removing insulation 9 6.4 Determination of cross-sectional area (S o ) 9 7 Testing conditi
20、ons 9 7.1 Specimen gripping . 9 7.2 Pre-loading and setting of extensometer . 9 7.3 Testing speed 9 7.4 Test . 10 8 Calculation of results 12 8.1 Tensile strength (R m ) 12 8.2 0,2 % proof strength (R p0,2A and R p0,2B ) 12 8.3 Modulus of elasticity (E oand E a ) . 12 9 Uncertainty . 12 10 Test repo
21、rt 13 10.1 Specimen 13 10.2 Results 13 10.3 Test conditions 13 Annex A (informative) Additional information relating to Clauses 1 to 10 14 Annex B (informative) Uncertainty considerations 19 Annex C (informative) Specific examples related to mechanical tests 23 Bibliography 32 Figure 1 Stress-strain
22、 curve and definition of modulus of elasticity and 0,2 % proof strengths 11 Figure A.1 An example of the light extensometer, where R1 and R3 indicate the corner radius 15 Figure A.2 An example of the extensometer provided with balance weight and vertical specimen axis . 16 Figure C.1 Measured stress
23、 versus strain curve of the rectangular cross section NbTi wire and the initial part of the curve 23 Figure C.2 0,2 % offset shifted regression line, the raw stress versus strain curve and the original raw data of stress versus strain . 29 61788-6 IEC:2011 3 Table B.1 Output signals from two nominal
24、ly identical extensometers 20 Table B.2 Mean values of two output signals . 20 Table B.3 Experimental standard deviations of two output signals 20 Table B.4 Standard uncertainties of two output signals 21 Table B.5 Coefficient of variations of two output signals. 21 Table C.1 Load cell specification
25、s according to manufacturers data sheet 26 Table C.2 Uncertainties of displacement measurement 26 Table C.3 Uncertainties of wire width measurement . 27 Table C.4 Uncertainties of wire thickness measurement 27 Table C.5 Uncertainties of gauge length measurement 27 Table C.6 Calculation of stress at
26、0 % and at 0,1 % strain using the zero offset regression line as determined in Figure C.1b). 28 Table C.7 Linear regression equations computed for the three shifted lines and for the stress versus strain curve in the region where the lines intersect 29 Table C.8 Calculation of strain and stress at t
27、he intersections of the three shifted lines with the stress strain curve . 30 Table C.9 Measured stress versus strain data and the computed stress based on a linear fit to the data in the region of interest 31 4 61788-6 IEC:2011 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SUPERCONDUCTIVITY Part 6: M
28、echanical properties measurement Room temperature tensile test of Cu/Nb-Ti composite superconductors FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The obje
29、ct of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specificatio
30、ns (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liais
31、ing with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express
32、, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committee
33、s 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 the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National C
34、ommittees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not p
35、rovide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the
36、latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever,
37、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 any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications i
38、s 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 be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC
39、 61788-6 has been prepared by IEC technical committee 90: Superconductivity. This third edition cancels and replaces the second edition published in 2008. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: spec
40、ific example of uncertainty estimation related to mechanical tests was supplemented as Annex C. 61788-6 IEC:2011 5 The text of this standard is based on the following documents: FDIS Report on voting 90/267/FDIS 90/278/RVD Full information on the voting for the approval of this standard can be found
41、 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 under the general title Superconductivity, can be found on the IEC website. The committee has decided tha
42、t 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 publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPO
43、RTANT 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. 6 61788-6 IEC:2011 INTRODUCTION The Cu/Nb-Ti super
44、conductive composite wires currently in use are multifilamentary composite material with a matrix that functions as a stabilizer and supporter, in which ultrafine superconductor filaments are embedded. A Nb-4055 mass % Ti alloy is used as the superconductive material, while oxygen-free copper and al
45、uminium of high purity are employed as the matrix material. Commercial composite superconductors have a high current density and a small cross-sectional area. The major application of the composite superconductors is to build superconducting magnets. While the magnet is being manufactured, complicat
46、ed stresses 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 indispensable to determine the mechanical properties of the superconductive wires, of which the winding
47、s are made. 61788-6 IEC:2011 7 SUPERCONDUCTIVITY Part 6: Mechanical properties measurement Room temperature tensile test of Cu/Nb-Ti composite superconductors 1 Scope This part of IEC 61788 covers a test method detailing the tensile test procedures to be carried out on Cu/Nb-Ti superconductive compo
48、site wires at room temperature. This test is used to measure modulus of elasticity, 0,2 % proof strength of the composite due to yielding of the copper component, and tensile strength. The value for percentage elongation after fracture and the second type of 0,2 % proof strength due to yielding of t
49、he Nb-Ti component serves only as a reference (see Clauses A.1 and A.2). The sample covered by this test procedure has a round or rectangular cross-section with an area of 0,15 mm 2to 2 mm 2and a copper to superconductor volume ratio of 1,0 to 8,0 and without the insulating coating. 2 Normative references The following referenced documents are indispensable for the
