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BS EN IEC 61788-25:2018 Superconductivity - Mechanical properties measurement. Room temperature tensile test on REBCO wires, 2018
- undefined [Go to Page]
- Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
- English [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- Figures [Go to Page]
- Figure 1 – Typical stress–strain curve and definition of moduli of elasticityand 0,2 % proof strengths
- 4 Principle
- 5 Apparatus [Go to Page]
- 5.1 General
- 5.2 Testing machine
- 5.3 Extensometer
- 6 Specimen preparation [Go to Page]
- 6.1 General
- 6.2 Length of specimen
- 6.3 Determination of cross-sectional area (So)
- 7 Testing conditions [Go to Page]
- 7.1 Specimen gripping
- 7.2 Setting of extensometer
- 7.3 Testing speed
- 7.4 Test
- 8 Calculation of results [Go to Page]
- 8.1 Modulus of elasticity (E)
- 8.2 0,2 % proof strength (Rp0,2-0 and Rp0,2-U)
- 9 Uncertainty of measurement
- 10 Test report [Go to Page]
- 10.1 Specimen
- 10.2 Results
- Annex A (informative)Additional information relating to Clauses 1 to 10 [Go to Page]
- A.1 General
- A.2 Extensometer [Go to Page]
- A.2.1 Double extensometer
- Figure A.1 – Low-mass Siam twin type extensometer
- Figure A.2 – Low-mass double extensometer [Go to Page]
- A.2.2 Single extensometer
- A.3 Elastic limit
- Figure A.3 – An example of the extensometer provided with balance weightand vertical specimen axis
- 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 [Go to Page]
- Table A.1 – Relative standard uncertainty (XRSU) and coefficient of variance (X)for experimental data of E0 and EU
- Table A.2 – Relative standard uncertainty and coefficient of variancefor experimental data of Rp0,2-0 and Rp0,2-U
- A.8 Discretion applying this document
- A.9 Assessment on the reliability of the test equipment
- A.10 Additional information for test report [Go to Page]
- 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
- Annex B (informative)Evaluation of combined standard uncertaintyfor the modulus of elasticity [Go to Page]
- B.1 Model equation
- B.2 Estimation of standard uncertainty [Go to Page]
- B.2.1 Precondition
- B.2.2 Stress measurement
- B.2.3 Size measurement
- B.2.4 Strain measurement
- B.2.5 Uncertainties on measurement of gauge length
- Table B.1 – Uncertainties for experimental variables in Formula (B.6)
- B.3 Significant experimental factor [Go to Page]
- 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 [Go to Page]
- B.3.2 Thickness measurement [Osamura et al., 2014]
- Figure B.2 – Relative standard uncertainty for the thickness measurementas a function of tape thickness
- Bibliography [Go to Page]