prEN IEC 61788-28:2025
(Main)Mechanical properties measurement - Tensile test of practical REBCO and BSCCO composite superconductors at cryogenic temperatures
Mechanical properties measurement - Tensile test of practical REBCO and BSCCO composite superconductors at cryogenic temperatures
Merjenje mehanskih lastnosti - Natezni preskus praktičnih kompozitnih superprevodnikov REBCO in BSCCO pri kriogenih temperaturah
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2025
Merjenje mehanskih lastnosti - Natezni preskus praktičnih kompozitnih
superprevodnikov REBCO in BSCCO pri kriogenih temperaturah
Mechanical properties measurement - Tensile test of practical REBCO and BSCCO
composite superconductors at cryogenic temperatures
Ta slovenski standard je istoveten z: prEN IEC 61788-28:2025
ICS:
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
90/548/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61788-28 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-08-08 2025-10-31
SUPERSEDES DOCUMENTS:
90/527/CD, 90/541A/CC
IEC TC 90 : SUPERCONDUCTIVITY
SECRETARIAT: SECRETARY:
Japan Mr Hideki II
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
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This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Mechanical properties measurement - Tensile test of practical REBCO and BSCCO composite
superconductors at cryogenic temperatures
PROPOSED STABILITY DATE: 2037
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
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IEC CDV 61788-28 © IEC 2025
3 CONTENTS
5 FOREWORD . 4
6 INTRODUCTION . 6
7 1 Scope . 7
8 2 Normative references . 7
9 3 Terms and definitions . 8
10 4 Principle . 10
11 5 Apparatus . 10
12 5.1 General . 10
13 5.2 Testing machine . 10
14 5.3 Extensometer . 11
15 6 Specimen preparation . 11
16 6.1 General . 11
17 6.2 Length of specimen . 11
18 6.3 Determination of cross-sectional area (𝑺𝑺𝑺𝑺) . 11
19 7 Testing conditions . 12
20 7.1 Specimen gripping . 12
21 7.2 Setting of extensometers . 12
22 7.3 Cooling procedure. 12
23 7.4 Testing speed . 12
24 7.5 Test . 12
25 8 Calculation of results . 12
26 8.1 Modulus of elasticity (𝑬𝑬𝑺𝑺 and 𝑬𝑬𝐔𝐔) . 12
27 8.2 0,2% proof strength (𝑹𝑹𝐩𝐩𝑺𝑺,𝟐𝟐_𝑺𝑺 and 𝑹𝑹𝐩𝐩𝑺𝑺,𝟐𝟐_𝐔𝐔) . 13
28 9 Uncertainty of measurand . 13
29 10 Test report . 14
30 10.1 Specimen . 14
31 10.2 Results . 14
32 Annex A (informative) Additional information relating to measurement, apparatus, and
33 calculation . 15
34 A.1 Scope . 15
35 A.2 Extensometer . 15
36 A.2.1 Double extensometer . 15
37 A.2.2 Single extensometer . 16
38 A.3 Gripping force . 16
39 A.4 Percentage elongation after fracture (𝑨𝑨𝑨𝑨) . 16
40 A.5 Condition of straining to fracture . 17
41 A.6 Additional information for test report . 17
42 A.6.1 General . 17
43 A.6.2 Test result . 17
44 A.6.3 Test conditions . 17
45 A.7 Evaluation of cross-sectional area of the specimen . 17
46 Annex B (informative) Evaluation of combined standard uncertainty for HTS 𝑬𝑬𝑺𝑺 and
47 𝑹𝑹𝐩𝐩𝑺𝑺,𝟐𝟐_𝑺𝑺 measurements . 20
48 B.1 Relative standard uncertainty (RSU) . 20
IEC CDV 61788-28 © IEC 2025
49 B.2 Type-B uncertainty evaluation . 22
50 B.3 Comparison between Types A and B uncertainties . 25
51 Bibliography . 26
53 a) general view . 9
54 Figure 1 – Typical stress-strain curve and definition of modulus of elasticity and 0,2%
55 proof strengths at 77 K. . 9
56 Figure A.1 – Low-mass Siam twin type extensometer. Dimensions in millimeters. . 15
57 Figure A.2 – Low-mass double extensometer. Dimensions in millimeters. . 15
58 Figure A.3 – An example of the extensometer provided with balance weight and
59 vertical specimen axis. . 16
60 Figure A.4 – Typical cross-sectional area of a 2G HTS REBCO tape . 17
61 Figure A.5 – Schematical illustration of the HTS specimen with points where the
62 thickness of the specimen shall be measured. . 18
63 a) side view b) front view . 18
64 Figure A.6 – Blade anvil. . 18
65 Figure B.1 – Force-permanent strain curve for the sample C2-05 G . 23
67 Table B.1 – Specimens distributed in the international RRT . 20
68 Table B.2 – 𝑬𝑬𝑺𝑺 and relative standard uncertainty for all specimens . 21
69 Table B.3 – 𝑹𝑹𝐩𝐩𝑺𝑺,𝟐𝟐_𝑺𝑺 and relative standard uncertainty for all specimens . 21
70 Table B.4 – 𝑬𝑬𝐔𝐔 and relative standard uncertainty for all specimens . 21
71 Table B.5 – 𝑹𝑹𝐩𝐩𝑺𝑺,𝟐𝟐_𝐔𝐔 and relative standard uncertainty for all specimens . 22
72 Table B.6 – Uncertainty budget for 𝑬𝑬𝑺𝑺 for sample C2-05 G . 22
73 Table B.7 – Uncertainty budget for 𝑹𝑹𝑹𝑹𝑺𝑺,𝟐𝟐_𝑺𝑺 for sample C2-05 G . 24
IEC CDV 61788-28 © IEC 2025
76 INTERNATIONAL ELECTROTECHNICAL COMMISSION
77 ____________
79 SUPERCONDUCTIVITY
81 Part 28: Mechanical properties measurement – Tensile test of practical
82 REBCO and BSCCO flat tape composite superconductors at liquid
83 nitrogen temperature
85 FOREWORD
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