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GB/T 42903-2023: Metallic materials - Testing methods for creep crack and creep-fatigue crack growth rates
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Metallic materials - Testing methods for creep crack and creep-fatigue crack growth rates
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GB/T 42903-2023
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Basic data | Standard ID | GB/T 42903-2023 (GB/T42903-2023) | | Description (Translated English) | Metallic materials - Testing methods for creep crack and creep-fatigue crack growth rates | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H22 | | Classification of International Standard | 77.040.10 | | Word Count Estimation | 35,311 | | Date of Issue | 2023-08-06 | | Date of Implementation | 2023-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 42903-2023: Metallic materials - Testing methods for creep crack and creep-fatigue crack growth rates
---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 77.040.10
CCSH22
National Standards of People's Republic of China
Creep cracks and creep-fatigue crack propagation of metallic materials
Rate determination method
Published on 2023-08-06
Implemented on 2023-12-01
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
PrefaceⅠ
Introduction II
1 Scope 1
2 Normative reference documents 1
3 Terms and Definitions 1
4 Symbols and descriptions 3
5 Test Principle 5
6 General requirements 5
7 Test equipment 6
8 Sample 9
9 Test procedures 11
10 Test result processing 13
11 Test report 14
Appendix A (normative) Calculation method of fracture mechanics parameters 15
Appendix B (normative) Creep-fatigue crack growth rate description model 17
Appendix C (normative) Calculation method for fracture mechanics parameters of welded joint specimens 19
Appendix D (informative) Creep-fatigue small crack growth rate test method 20
Appendix E (informative) Displacement measuring device 25
Appendix F (informative) Determination of crack length by DC potential method 27
Appendix G (informative) Calculation method of creep displacement rate 28
Appendix H (informative) Recommended data processing methods 29
Reference 30
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is proposed by the China Iron and Steel Industry Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This document was drafted by. East China University of Science and Technology, China Machinery Testing Equipment Co., Ltd., Gangyan Nake Testing Technology Co., Ltd., Tianjin
University of Tianjin, China University of Petroleum (East China), Metallurgical Industry Information Standards Research Institute, Shenzhen Wantai Testing Equipment Co., Ltd., Xiamen Special Equipment
Inspection and Testing Institute, Lishi (Shanghai) Scientific Instrument Co., Ltd., China United Heavy-Duty Gas Turbine Technology Co., Ltd., China Aviation Development Commercial Aviation
Engine Co., Ltd., China General Nuclear Power Research Institute Co., Ltd., China Nuclear Power Research and Design Institute, Baoshan Iron and Steel Co., Ltd.
The main drafters of this document. Zhang Xiancheng, Tan Jianping, Tu Shandong, Xuan Fuzhen, Gao Yifei, Dong Li, Ma Wei, Chen Gang, Jiang Wenchun, Huang Xing,
Zou Zhijian, Wang Bin, Li Wei, Wang Ji, Lu Rongsheng, Wang Runzi, Hou Huining, Wang Zhengdong, Ma Shuangwei, Xu Huoli, Duan Fangmiao, Zhang Chengcheng, Chen Yalong,
Zhu He, Du Juan, Zhao Yuchen, Zeng Fei, Liu Liqiang, Fang Jian, Tian Genqi, Li Yilei, Zhang Yucai, Hu Hongwei, Gao Yunxiao, Liu Lanzhou, Lin Qiang, Shi Kexian,
Fu Xibin.
Introduction
Equipment in the fields of electric power, refining, metallurgy, and aviation has shown a trend of increasing service temperature and extending service time, causing creep
And creep-fatigue failure and prevention and control issues have become more prominent. Due to the limitations of the manufacturing process, many components already have cracks before use.
cracks or other defects; at the same time, cracks are likely to initiate at the stress concentration locations of the component during service. It is these cracks and their creeping
The expansion under deformation and creep-fatigue conditions causes failure of high-temperature components and even causes catastrophic accidents. To accurately evaluate structures with cracks
To ensure the safety and reliability of parts, it is necessary to test the creep crack and creep-fatigue crack growth properties of materials.
Determine the creep crack initiation time and creep cracking time of metallic materials and welded joints under constant temperature and static or quasi-static loads.
Expansion rate, sample types are compact tensile specimen, C-type tensile specimen, single-sided notched tensile specimen, single-sided notched bending specimen, double-sided notched specimen
Tensile specimen or center notch tensile specimen. The relationship between crack growth rate and fracture parameter K or C*(C*(t) or Ct) is obtained through data processing.
Tie. For creep brittle materials, K or Ct is used to characterize the crack growth rate; for creep ductile materials, the fracture parameter C*(C*(t) is used
or Ct) characterizes the crack growth rate.
Under constant temperature and uniaxial cyclic loading, the creep-fatigue crack growth rate of metallic materials is measured. The test specimen is a compact tensile test.
Sample. The relationship between the crack growth rate and the fracture parameter ΔK or (Ct)avg is obtained through data processing. For creep brittle materials, the stress
The strength factor range ΔK represents the creep-fatigue crack growth rate da/dN; for creep ductile materials, the average value of the fracture parameters is used
(Ct)avg represents the average crack growth rate (da/dt)avg during cyclic load maintenance.
Creep cracks and creep-fatigue crack propagation of metallic materials
Rate determination method
1 Scope
This document specifies the symbols and descriptions, test principles, and tests related to creep crack and creep-fatigue crack growth rate tests on metallic materials.
Sample design, test procedures, test results processing and test reports.
This document is applicable to the determination of creep cracks in metallic homogeneous materials and metallic welded joints under static or quasi-static loading at constant temperature.
Crack initiation time and creep crack growth rate; Determination of creep-fatigue cracks in metallic homogeneous materials under uniaxial cyclic loading at constant temperature
Expansion rate.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document.
GB/T 8170 Numerical rounding rules and representation and determination of limit values
GB/T 12160 Calibration of extensometer systems for uniaxial testing of metallic materials
GB/T 16825.1 Inspection and calibration of static uniaxial testing machines for metallic materials Part 1.Tensile and/or compression testing machines
Inspection and calibration of force measuring systems
GB/T 16825.2 Inspection of static uniaxial testing machines Part 2.Inspection of applied force of tensile creep testing machines
GB/T 25917.1 Uniaxial fatigue testing system Part 1.Dynamic force calibration
GB/T 34104 Inspection of loading coaxiality of metal material testing machines
JJF1637 Calibration Specification for Inexpensive Metal Thermocouples
JJG141 working precious metal thermocouple
JJG276 High Temperature Creep and Durable Strength Testing Machine
JJG556 axial force fatigue testing machine
JJG617 digital temperature indicator regulator
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Creep crack growth rate creepcrackgrowthrate
The change in crack length per unit time under constant temperature and load.
3.2
da/dN
Crack length variation within a single cycle under constant temperature and cyclic loading with holding load.
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