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BS EN IEC 61788-25:2018

BS EN IEC 61788-25:2018

$142.49

Superconductivity – Mechanical properties measurement. Room temperature tensile test on REBCO wires

Published By Publication Date Number of Pages
BSI 2018 32
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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 mm 2 to 6,0 mm 2 (corresponding to the tapes with width of 2,0 mm to 12,0 mm and thickness of 0,06 mm to 0,5 mm)

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PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
6 English
CONTENTS
8 FOREWORD
10 INTRODUCTION
11 1 Scope
2 Normative references
3 Terms and definitions
13 Figures
Figure 1 – Typical stress–strain curve and definition of moduli of elasticityand 0,2 % proof strengths
14 4 Principle
5 Apparatus
5.1 General
5.2 Testing machine
5.3 Extensometer
6 Specimen preparation
6.1 General
6.2 Length of specimen
15 6.3 Determination of cross-sectional area (So)
7 Testing conditions
7.1 Specimen gripping
7.2 Setting of extensometer
7.3 Testing speed
7.4 Test
8 Calculation of results
8.1 Modulus of elasticity (E)
16 8.2 0,2 % proof strength (Rp0,2-0 and Rp0,2-U)
9 Uncertainty of measurement
17 10 Test report
10.1 Specimen
10.2 Results
18 Annex A (informative)Additional information relating to Clauses 1 to 10
A.1 General
A.2 Extensometer
A.2.1 Double extensometer
Figure A.1 – Low-mass Siam twin type extensometer
19 Figure A.2 – Low-mass double extensometer
20 A.2.2 Single extensometer
A.3 Elastic limit
Figure A.3 – An example of the extensometer provided with balance weightand vertical specimen axis
21 A.4 Gripping force
A.5 Percentage elongation after fracture (Af)
A.6 Condition of straining to fracture
A.7 Relative standard uncertainty (RSU)
Tables
Table A.1 – Relative standard uncertainty (XRSU) and coefficient of variance (X)for experimental data of E0 and EU
22 Table A.2 – Relative standard uncertainty and coefficient of variancefor experimental data of Rp0,2-0 and Rp0,2-U
23 A.8 Discretion applying this document
A.9 Assessment on the reliability of the test equipment
A.10 Additional information for test report
A.10.1 General
A.10.2 Test result
A.10.3 Test conditions
Table A.3 – Value of X for the data of the modulus of elasticity andthe 0,2 % proof strength tested according to this document
24 Annex B (informative)Evaluation of combined standard uncertaintyfor the modulus of elasticity
B.1 Model equation
25 B.2 Estimation of standard uncertainty
B.2.1 Precondition
B.2.2 Stress measurement
26 B.2.3 Size measurement
27 B.2.4 Strain measurement
28 B.2.5 Uncertainties on measurement of gauge length
Table B.1 – Uncertainties for experimental variables in Formula (B.6)
29 B.3 Significant experimental factor
B.3.1 Initial strain rate [Osamura et al., 2014]
Figure B.1 – Strain rate dependence of the relative standard uncertaintygiven by Formula (B.6)
Table B.2 – Summary of standard uncertainty evaluation, where the initial strain rateand the thickness were used as 3 x 10−4 /s and 0,1 mm, respectively
30 B.3.2 Thickness measurement [Osamura et al., 2014]
Figure B.2 – Relative standard uncertainty for the thickness measurementas a function of tape thickness
31 Bibliography

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BS EN IEC 61788-25:2018
$142.49