GB/T 26140-2023 English PDF

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GB/T 26140-2023: Non-destructive testing - Standard test method for determining residual stresses by neutron diffraction
Status: Valid

GB/T 26140: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 26140-2023	814	Add to Cart	6 days	Non-destructive testing - Standard test method for determining residual stresses by neutron diffraction	Valid
GB/T 26140-2010	1359	Add to Cart	6 days	Non-destructive testing -- Standards test method for determining residual stresses by neutron diffraction	Obsolete

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GB/T 26641   GB/T 23901.5   GB/T 23906   GB/T 26141.2   GB/T 26141.1   

Basic data

Standard ID: GB/T 26140-2023 (GB/T26140-2023)
Description (Translated English): Non-destructive testing - Standard test method for determining residual stresses by neutron diffraction
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Classification of International Standard: 19.100
Word Count Estimation: 44,469
Date of Issue: 2023-05-23
Date of Implementation: 2023-05-23
Older Standard (superseded by this standard): GB/T 26140-2010
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 26140-2023: Non-destructive testing - Standard test method for determining residual stresses by neutron diffraction

---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 19:100 CCSJ04 National Standards of People's Republic of China Replacing GB/T 26140-2010 Neutron Diffraction Method for Nondestructive Testing Residual Stress Measurement (ISO 21432:2019, IDT) Released on 2023-05-23 2023-05-23 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface I Introduction II 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Symbols and abbreviations5 5 Summary of method 6 6 Purpose of measurement, sample geometry and material considerations 12 7 Measurement preparation 13 8 Measurement and recording requirements 19 9 Stress calculation 22 10 Results Reliability 24 11 report 25 Appendix A (Informative) Measurement and Analysis Methods 27 Appendix B (Informative) Determination of Uncertainty of Measured Physical Quantities 34 Reference 37

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: This document replaces GB/T 26140-2010 "Neutron Diffraction Method for Measuring Residual Stress in Nondestructive Testing", and GB/T 26140- Compared with:2010, except for structural adjustment and editorial changes, the main technical changes are as follows: a) Changes and additions of some terms and definitions (Chapter 3, Chapter 3 of the:2010 edition); b) Added requirements for measurement purpose and sample geometry (see 6:1, 6:2, 6:3); c) Changed the selection requirements of the diffraction crystal plane (see 7:3:1:2, 6:3:1:2 of the:2010 edition); d) Changed the requirements for measuring strain based on time-of-flight devices (see 7:3:2, 6:3:2 of the:2010 edition); e) Changed the requirements for the positioning process (see 7:4, 6:4 of the:2010 edition); f) Changed the requirements for determining the unstrained or reference lattice spacing (see 7:6, 6:6 of the:2010 edition); g) Changed the result reliability requirements (see Chapter 10, Chapter 10 of the:2010 edition); h) Added reporting requirements for uncertainty and error (see 11:7): This document is equivalent to ISO 21432:2019 "Neutron Diffraction Method for Nondestructive Testing Residual Stress Measurement": The following minimal editorial changes have been made to this document: --- Corrected the unit symbol of Planck's constant in 4:1, and changed "Js" to "J s"; ---Corrected the symbols of azimuth angles in 4:1, 4:2, 9:3 and Figure 11, uniformly changed the lowercase to uppercase, and changed the xy plane in Figure 11 The angle ψ is changed to Ф to make it consistent with formula (14) ~ formula (16); --- Corrected the sign of the scattering angle in Figure 2, and changed "2θa" to "2θ"; ---Correct the representation of the crystal plane corresponding to the diffraction peak in 5:4:3, and change "hkl" to "(hkl)"; ---Corrected the unit of expansion coefficient in B:5, changed "°C" to "K-1"; ---Correct the operation symbol in front of the εy item in the formula (A:1), and change "-" to " "; --- Corrected the publication date and page number of reference [20]: Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed and managed by the National Nondestructive Testing Standardization Technical Committee (SAC/TC56): This document is drafted by: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Shanghai Materials Research Institute Co:, Ltd:, China Aviation Development Corporation Beijing Institute of Aeronautical Materials, Shanghai Jiao Tong University, Dongguan Advanced Institute of Materials Gene Technology: The main drafters of this document: Zhang Changsheng, Sun Guangai, Yang Zhaolong, Ding Jie, Guo Guangping, Wang Hong, Li Jian, Huang Yalin, Tian Yi, Li Hongjia, Huang Chaoqiang, Chen Bo, Zhong Shengyi, Zhang Shuyan, Li Nan, Gao Jianbo: This document was first published in:2010, and this is the first revision:

Introduction

Neutron diffraction is a non-destructive measurement method that can be used to determine the residual stress of crystalline materials, and can also be used to determine the internal stress of samples when subjected to external forces: Measurement: The sample or workpiece is transported to the neutron source, the elastic strain is measured, and then converted into stress: This procedure can be used to determine the material Internal and near-surface stresses: This document has been developed to provide a basis for reliable measurement of stress in engineering applications: Neutron Diffraction Method for Nondestructive Testing Residual Stress Measurement WARNING: This document does not address any security issues, and any such content, if any, is relevant to its application: by the user of this document It is the responsibility of establishing applicable safety and health practices and complying with them when using this document:

1 Scope

This document specifies a method for measuring residual stress in polycrystalline materials by neutron diffraction: This document is applicable to homogeneous, heterogeneous and containing different crystal Phase material sample testing: This document briefly describes the principles of the neutron diffraction technique and provides the following recommendations: ---Appropriate diffraction crystal plane selection for measurements that should be carried out for different types of materials; --- Selection of sample orientation in suitable measurements; ---The selection of the volume to be measured is related to the grain size and stress state of the material to be tested: This document specifies the procedure for accurately locating and aligning the detection site within the neutron beam, and the procedure for accurately defining the sample volume of the material used for the measurement: process: This document specifies the precautions for calibrating neutron diffraction devices and specifies the technical method for obtaining stress-free reference values: This document specifies various methods for performing neutron diffraction measurements, provides procedures for analyzing results and determining their statistical correlation, provides Recommendations for the determination of reliable estimates of residual stress from strain measurement data and for the assessment of the uncertainty in the results:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document: EN 13925-3:2015 X-ray diffraction for non-destructive testing of polycrystalline and amorphous materials Part 3: Apparatus (Non- ments)

3 Terms and Definitions

The following terms and definitions apply to this document: ISO and IEC maintain the following terminology databases for standardization work: ---ISO online browsing platform, the URL is https://www:iso:org/obp; 3:1 neutron absorption neutron absorption The phenomenon of neutrons being captured by atomic nuclei: Note: See reference [1] for the table of nuclear capture cross sections: 3:2 correction alignment The adjustment made to the position and orientation of the sample and all components of the apparatus so that measurements can be made accurately at the expected sample location: ......

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