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GB/T 44003-2024: Mechanical property measurement - Delamination strength test for REBCO coated conductors(copper-plated)
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Mechanical property measurement - Delamination strength test for REBCO coated conductors(copper-plated)
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Basic data
| Standard ID | GB/T 44003-2024 (GB/T44003-2024) |
| Description (Translated English) | Mechanical property measurement - Delamination strength test for REBCO coated conductors(copper-plated) |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H61;H22 |
| Classification of International Standard | 29.050; 77.040.10 |
| Word Count Estimation | 26,251 |
| Date of Issue | 2024-04-25 |
| Date of Implementation | 2024-11-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 44003-2024: Mechanical property measurement - Delamination strength test for REBCO coated conductors(copper-plated)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 29:050;77:040:10
CCSH61;H22
National Standards of People's Republic of China
Mechanical Properties Measurement of REBCO Coatings
Conductor (copper plating) delamination strength test method
Released on 2024-04-25
2024-11-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Principle 2
5 Device 2
5:1 Testing machine 2
5:2 Tensile fixture 2
5:3 Anvil 3
5:4 Welding fixture 3
5:5 Welding heating table 3
6 Test connector preparation 3
6:1 Test sample 3
6:2 Anvil 3
6:3 Welding of anvil and test sample 4
6:3:1 Apply solder 4
6:3:2 Heating welding 4
7 Test Step 4
7:1 Connector Assembly 4
7:2 Room temperature test 4
7:3 Liquid nitrogen temperature zone test 4
7:4 Test Data Collection 4
8 Data Processing 5
8:1 Delamination strength 5
8:2 Three-Parameter Weibull Distribution 5
8:3 Delamination strength under 99% reliability criterion 6
8:4 Uncertainty 6
9 Test Report 6
9:1 Sample 6
9:2 Test conditions 6
9:3 Results 6
Appendix A (Informative) Fixture Reference Information and Assembly Notes 7
A:1 General Principles 7
A:2 Tensile fixture (base) 7
A:3 Anvil 7
A:4 Vertical welding 8
A:5 Welding fixture 9
Appendix B (Informative) Weibull Distribution and Reliability 10
B:1 Overview 10
B:2 Three-parameter Weibull distribution10
B:2:1 Calculation of γ10
B:2:2 Calculation of α and β 11
B:3 Reliability Function 11
B:4 Sample size 11
Appendix C (Informative) Uncertainty 12
C:1 Standard uncertainty of single delamination strength measurement 12
C:1:1 σd Combined standard uncertainty 12
C:1:2 Standard uncertainty of F12
C:1:3 Standard uncertainty of a and b 13
C:1:4 Example 13
C:2 Uncertainty of delamination strength σ99 under 99% reliability criterion 14
Appendix D (Informative) Main results of the round-robin test 16
D:1 Sample parameters used in the round-robin test 16
D:2 Round Robin Test Results 16
Reference 17
Figure 1 Assembly drawing 2
Figure 2 Schematic diagram of the structure of REBCO coated conductor sample 3
Figure 3 Force-displacement curve 5
Figure A:1 Tensile fixture (base) 7
Figure A:2 Upper anvil 7
Figure A:3 Lower anvil 8
Figure A:4 Schematic diagram of connector 8
Figure A:5 Welding fixture 9
Table C:1 Single delamination strength test data 14
Table C:2 Uncertainty results related to single delamination strength test 14
Table D:1 Basic parameters of samples used in the cyclic comparison test 16
Table D:2 Cyclic comparison test results 16
Foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents"
Drafting:
Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:
This document was proposed by the Chinese Academy of Sciences:
This document is under the jurisdiction of the National Superconductivity Standardization Technical Committee (SAC/TC265):
This document was drafted by: Lanzhou University, Shanghai Jiaotong University, Shanghai Superconducting Technology Co:, Ltd:, Suzhou New Materials Research Institute Co:, Ltd:
Shanghai Shangchuang Superconducting Technology Co:, Ltd:, Institute of Plasma Physics, Chinese Academy of Sciences, Shanghai University, China State Shipbuilding Corporation
712 Institute, Electric Power Research Institute of Yunnan Power Grid Co:, Ltd:
The main drafters of this document are: Zhang Xingyi, Liu Cong, Wang Yushan, Zhu Jiamin, Chen Sikan, Liu Huajun, Liu Fang, Tao Shu, Cai Chuanbing, Li Minjuan,
Zhou Yong, Hei Yingdun:
Introduction
REBCO (RE refers to rare earth elements such as Y, Gd, Dy) coated conductors, also known as the second generation of high temperature superconducting tapes, have high irreversible magnetic fields:
It has excellent current-carrying capacity under high fields and has important application prospects in superconducting magnets, superconducting cables and superconducting motors:
REBCO coated conductor is a multi-layer composite material consisting of a copper stabilization layer, a silver layer, a superconducting layer, a buffer layer and a substrate layer:
The conductive layer and buffer layer are ceramic materials, and the other layers are metal or alloy materials:
Delamination will occur due to the effect of thermal stress: Once delamination occurs, the current carrying capacity of the material will decrease, which will bring safety hazards to the operation of the superconducting device:
Therefore, it is necessary to establish a standard test method to accurately measure the delamination strength of REBCO coated conductors:
The anvil pull method is a method for testing the delamination strength of composite layered materials at room temperature and liquid nitrogen temperature, which is simple in principle and easy to implement:
Therefore, this document uses the anvil pull method to test the REBCO coated conductor (copper plating) at room temperature and liquid nitrogen temperature:
Delamination strength test was carried out at 3700 °C:
In the process of testing the delamination strength of REBCO coated conductor (copper plating) using the anvil pull method, the fracture toughness of ceramic materials is much lower than that of gold:
Metals and alloys cause delamination to occur in the superconducting layer and buffer layer; the brittleness of ceramic materials makes the delamination strength test data discrete:
The data obtained cannot provide guidance for material preparation and engineering design, so special data analysis methods are needed to process the data:
This paper uses the three-parameter Weibull distribution data analysis method to process the test data of delamination strength:
On the basis of the fitting parameters, the delamination strength can be directly given based on the reliability criterion:
The room temperature delamination strength test characterizes the delamination strength of REBCO coated conductors at the factory and serves as a reference for the delamination strength at liquid nitrogen temperature:
The delamination strength test at liquid nitrogen temperature is used to characterize the delamination strength of REBCO coated conductors at low temperatures:
The delamination strength can be used to evaluate the preparation process of REBCO coated conductors and serve as a basis for the design of superconducting devices using such conductors:
Mechanical Properties Measurement of REBCO Coatings
Conductor (copper plating) delamination strength test method
1 Scope
This document describes the testing and data processing methods for the delamination strength of REBCO coated conductors at room temperature and liquid nitrogen temperature:
This document applies to REBCO coated conductors (copper plating) with a copper layer thickness ranging from 5 mm to 20 mm:
REBCO coated conductors can be found in this document:
This document does not apply to REBCO coatings that are reinforced with stainless steel or other metals or that have an outer surface coated/wrapped with insulating material:
Layer conductor:
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document:
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document:
GB/T 2900:100 Electrical terminology Superconductivity
GB/T 13634-2019 Calibration of standard dynamometers for uniaxial testing machines of metallic materials
GB/T 16825:1-2022 Inspection and calibration of static uniaxial testing machines for metallic materials Part 1: Tension and (or) compression testing
Inspection and calibration of the force measuring system of the testing machine
GB/T 34987-2017 Weibull analysis
3 Terms and definitions
The terms and definitions defined in GB/T 2900:100 and the following apply to this document:
3:1
anvil
In the delamination strength test, the contact area with the sample is a rectangular component connecting the sample surface and the chuck:
3:2
unionbody
The anvil and the sample are welded together to form a whole:
3:3
The tensile force at any time during the delamination strength test is divided by the contact area between the anvil and the sample:
3:4
Delamination strength
σd
Transverse tensile stress at which the sample fails:
Note: Sample failure refers to the phenomenon of interlayer separation under the action of load, which is manifested as the load reaching the maximum value and then suddenly dropping to 0:
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