IEC 61788-18-2013 Superconductivity - Part 18 Mechanical properties measurement - Room temperature tensile test of Ag- and or Ag alloy-sheathed Bi-2223 and Bi-2.pdf

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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

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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

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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