EN IEC 61788-25:2018

Superconductivity - Part 25: Mechanical properties measurement - Room temperature tensile test on REBCO wires

IEC 61788-25:2018 specifies the test method and procedures for testing tensile mechanical properties of REBCO superconductive composite tapes at room temperature. This test is used to measure the modulus of elasticity and 0,2 % proof strength. The values for elastic limit, fracture strength and percentage elongation after fracture serve only as a reference. This document applies to samples having a rectangular cross-section with an area of 0,12 mm2 to 6,0 mm2 (corresponding to the tapes with width of 2,0 mm to 12,0 mm and thickness of 0,06 mm to 0,5 mm)

Supraleitfähigkeit - Teil 25: Messung der mechanischen Eigenschaften - Messung der Zugfestigkeit von REBCO Supraleiterdrähten bei Raumtemperatur

Supraconductivité - Partie 25: Mesure des propriétés mécaniques - Essai de traction à température ambiante des fils REBCO

IEC 61788-25:2018 spécifie la méthode et les procédures d’essai relatives aux propriétés mécaniques de traction des bandes composites supraconductrices REBCO à température ambiante. Cet essai est utilisé pour mesurer le module d’élasticité et la charge d’épreuve à 0,2 %. Les valeurs de la limite élastique, de la résistance à la rupture et du pourcentage d’allongement après rupture servent uniquement de référence. Le présent document s'applique aux échantillons ayant une section rectangulaire d’une surface comprise entre 0,12 mm2 et 6,0 mm2 (correspondant aux bandes de largeur comprise entre 2,0 mm et 12,0 mm et d’épaisseur comprise entre 0,06 mm et 0,5 mm).

Superprevodnost - 25. del: Merjenje mehanskih lastnosti - Natezni preskus pri sobni temperaturi na žicah REBCO (IEC 61788-25:2018)

Ta del standarda IEC 61788 določa preskusno metodo in postopke za preskušanje nateznih mehanskih lastnosti superprevodnih kompozitnih trakov REBCO pri sobni temperaturi. Ta preskus se uporablja za merjenje modula elastičnosti in napetosti tečenja 0,2 %. Vrednosti za mejo elastičnosti, prelomno trdnost in odstotek raztezka po prelomu so zgolj referenčne. Ta dokument se uporablja za vzorce s pravokotnim prerezom s površino od 0,12 mm2 do 6 mm2 (kar ustreza trakom s širino od 2 mm do 12 mm in debelino od 0,06 mm do 0,5 mm).

General Information

• Status: Published
• Publication Date: 01-Nov-2018
• Withdrawal Date: 02-Oct-2021
• ICS: 29.050 - Superconductivity and conducting materials
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: CLC/SR 90 - Superconductivity
• Drafting Committee: IEC/TC 90 - IEC_TC_90
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 02-Nov-2018
• Completion Date: 02-Nov-2018
• Ref Project: SIST EN IEC 61788-25:2019 - Superconductivity - Part 25: Mechanical properties measurement - Room Temperature tensile test on REBCO wires (IEC 61788-25:2018)

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2019
Superprevodnost - 25. del: Merjenje mehanskih lastnosti - Natezni preskus pri
sobni temperaturi na žicah REBCO (IEC 61788-25:2018)
Superconductivity - Part 25: Mechanical properties measurement - Room Temperature
tensile test on REBCO wires (IEC 61788-25:2018)
Supraleitfähigkeit - Teil 25: Messung der mechanischen Eigenschaften - Messung der
Zugfestigkeit von REBCO Supraleiterdrähten bei Raumtemperatur (IEC 61788-25:2018)
Supraconductivité - Partie 25: Mesure des propriétés mécaniques - Essai de traction à
température ambiante des fils REBCO (IEC 61788-25:2018)
Ta slovenski standard je istoveten z: EN IEC 61788-25:2018
ICS:
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
29.060.10 Žice Wires
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61788-25

NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2018
ICS 29.050; 77.040.10
English Version
Superconductivity - Part 25: Mechanical properties measurement
- Room temperature tensile test on REBCO wires
(IEC 61788-25:2018)
Supraconductivité - Partie 25: Mesure des propriétés Supraleitfähigkeit - Teil 25: Messung der mechanischen
mécaniques - Essai de traction à température ambiante des Eigenschaften - Messung der Zugfestigkeit von REBCO
fils REBCO Supraleiterdrähten bei Raumtemperatur
(IEC 61788-25:2018) (IEC 61788-25:2018)
This European Standard was approved by CENELEC on 2018-10-03. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61788-25:2018 E

European foreword
The text of document 90/404/FDIS, future edition 1 of IEC 61788-25, prepared by IEC/TC 90
"Superconductivity" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-07-03
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-10-03
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 61788-25:2018 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 61788-6:2011 NOTE Harmonized as EN 61788-6:2011 (not modified)
IEC 61788-18:2013 NOTE Harmonized as EN 61788-18:2013 (not modified)
IEC 61788-19:2013 NOTE Harmonized as EN 61788-19:2014 (not modified)
IEC 61788-21:2015 NOTE Harmonized as EN 61788-21:2015 (not modified)
ISO 6892-1 NOTE Harmonized as EN ISO 6892-1

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
ISO 376 -  Metallic materials - Calibration of force-proving instruments - -
used for the verification of uniaxial testing machines
ISO 7500-1 -  Metallic materials - Calibration and verification of static EN ISO 7500-1 -
uniaxial testing machines Part 1: Tension/compression
testing machines - Calibration and verification of the force-
measuring system
ISO 9513 -  Metallic materials - Calibration of extensometer systems EN ISO 9513 -
used in uniaxial testing
IEC 61788-25 ®
Edition 1.0 2018-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Superconductivity –
Part 25: Mechanical properties measurement – Room temperature tensile test on

REBCO wires
Supraconductivité –
Partie 25: Mesure des propriétés mécaniques – Essai de traction à température

ambiante des fils REBCO
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.050; 77.040.10 ISBN 978-2-8322-5988-7

– 2 – IEC 61788-25:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Principle . 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 Determination of cross-sectional area (S ) . 11
o
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 . 11
8.1 Modulus of elasticity (E) . 11
8.2 0,2 % proof strength (R and R ) . 12
p0,2-0 p0,2-U
9 Uncertainty of measurement . 12
10 Test report . 13
10.1 Specimen . 13
10.2 Results . 13
Annex A (informative) Additional information relating to Clauses 1 to 10 . 14
A.1 General . 14
A.2 Extensometer . 14
A.2.1 Double extensometer . 14
A.2.2 Single extensometer . 16
A.3 Elastic limit . 16
A.4 Gripping force . 17
A.5 Percentage elongation after fracture (A ) . 17
f
A.6 Condition of straining to fracture . 17
A.7 Relative standard uncertainty (RSU) . 17
A.8 Discretion applying this document . 19
A.9 Assessment on the reliability of the test equipment . 19
A.10 Additional information for test report . 19
A.10.1 General . 19
A.10.2 Test result . 19
A.10.3 Test conditions . 19
Annex B (informative) Evaluation of combined standard uncertainty for the modulus of
elasticity . 20
B.1 Model equation . 20
B.2 Estimation of standard uncertainty . 21

IEC 61788-25:2018 © IEC 2018 – 3 –
B.2.1 Precondition . 21
B.2.2 Stress measurement . 21
B.2.3 Size measurement . 22
B.2.4 Strain measurement . 23
B.2.5 Uncertainties on measurement of gauge length . 24
B.3 Significant experimental factor . 25
B.3.1 Initial strain rate [Osamura et al., 2014] . 25
B.3.2 Thickness measurement [Osamura et al., 2014] . 26
Bibliography . 27

Figure 1 – Typical stress–strain curve and definition of moduli of elasticity and 0,2 %
proof strengths. 9
Figure A.1 – Low-mass Siam twin type extensometer . 14
Figure A.2 – Low-mass double extensometer . 15
Figure A.3 – An example of the extensometer provided with balance weight and vertical
specimen axis . 16
Figure B.1 – Strain rate dependen
...