GB/T 24179-2023 English PDF

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GB/T 24179-2023: Metallic materials - Residual stress determination - Indentation strain-gage method
Status: Valid

GB/T 24179: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24179-2023	349	Add to Cart	4 days	Metallic materials - Residual stress determination - Indentation strain-gage method	Valid
GB/T 24179-2009	150	Add to Cart	Auto, < 3 mins	Metallic materials -- Residual stress determination -- The indentation strain-gage method	Obsolete

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Basic data

Standard ID: GB/T 24179-2023 (GB/T24179-2023)
Description (Translated English): Metallic materials - Residual stress determination - Indentation strain-gage method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H22
Classification of International Standard: 77.040.10
Word Count Estimation: 18,180
Date of Issue: 2023-08-06
Date of Implementation: 2024-03-01
Older Standard (superseded by this standard): GB/T 24179-2009
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 24179-2023: Metallic materials - Residual stress determination - Indentation strain-gage method

---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 Replace GB/T 24179-2009 Indentation strain method for determination of residual stress in metal materials Published on 2023-08-06 2024-03-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee

Table of contents

PrefaceⅠ 1 Scope 1 2 Normative reference documents 1 3 Terms and Definitions 1 4 Symbols and descriptions 1 5 Principle 2 6 Measuring equipment and materials 4 7 Measurement Step 5 8 Determination of stress calculation function 6 9 test report 7 Appendix A (normative) Stress calculation methods under different measurement conditions 9 Appendix B (informative) Calculation method for weld stress that does not match the strength of the base metal 12 Appendix C (informative) Numerical calibration method of strain function 13 Reference 14

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. This document replaces GB/T 24179-2009 "Indentation strain method for determination of residual stress in metallic materials" and is consistent with GB/T 24179-2009 In comparison, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Change the term "calibration coefficient" to "strain function" (see Chapter 3, Chapter 3 of the.2009 edition); b) Some symbols and descriptions have been changed (see Chapter 4, Chapter 4 of the.2009 edition); c) Changed the principle description (see Chapter 5, Chapter 5 of the.2009 edition); d) Delete the description of the piecewise linear relationship formula (2) and delete the formula (3) (see Chapter 5 of the.2009 edition); e) The 60Ω strain gauge resistance value has been deleted (see 6.2.1 of the.2009 edition); f) Changed the requirements for film base thickness (see 6.2.1,.2009 version of 6.2.1); g) The upper limit of the indenter diameter has been changed (see 6.2.3, 6.4.1 of the.2009 edition); h) The normative reference to GB/T 230.2 has been deleted (see 6.4.1 of the.2009 edition); i) Added specific provisions on the stress relief process of heat treatment of calibration test plates (see 8.2.1); j) It is clear that at least 7 to 8 stress levels are used for calibration to obtain a more accurate strain function, and the maximum value during calibration is increased. The applied stress should be less than the elastic limit of the material rather than the yield limit (see 8.3.3, 8.2.3 of the.2009 edition); k) Changed the calibration procedure for non-principal stress directions (see 8.5, 8.4 of the.2009 edition); l) "Models of strain gauges, strain gauges, and indentation generating equipment used" are added to the test report (see Chapter 9, Chapter 9 of the.2009 edition). 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. Institute of Metal Research, Chinese Academy of Sciences, Dongguan Advanced Institute of Materials Genetics, Harbin Boiler Factory Co., Ltd. Company, Wuhan Huatuo Measurement Technology Co., Ltd., Chinalco Materials Application Research Institute Co., Ltd., Guangdong Torch Testing Co., Ltd., Guangzhou Shipyard International Co., Ltd. Co., Ltd., Zhongshan Quality Supervision and Inspection Institute of Guangdong Province, Wuhan Iron and Steel Co., Ltd., and Metallurgical Industry Information Standards Research Institute. The main drafters of this document. Chen Jing, Chen Huaining, Li Ronfeng, Wang Shuo, Jiang Yunlu, Dong Li, Li Gan, Niu Guanmei, Huang Jiajian, Bin Yuanhong, Su Yuexiao, Liu Dong, Wang Xuanguo, Song Wentao, Shen Lei, Zeng Zhibin, Wang Guangpei, Hou Huining. This document was first published in.2009 and this is the first revision. Indentation strain method for determination of residual stress in metal materials

1 Scope

This document specifies the basic principles, measuring equipment and materials, and measuring procedures for measuring residual stress on the surface of metallic materials using the indentation strain method. Steps, determination of stress calculation function and test report. This document is applicable to the determination of residual stress on the surface of various metal materials with a hardness not greater than 50HRC.

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 231.2 Brinell hardness test of metallic materials Part 2.Inspection and calibration of hardness tester JJG623 Calibration Regulations for Resistance Strain Gauges

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 strain increment strainincrement Δε After an indentation is made on the material surface, the strain changes induced by the residual stress field and the spherical indentation are superimposed on each other. (output) quantity. 3.2 The relationship function between strain increment and elastic strain. Note. It is related to the material being tested, the shape of the strain rosette, and the size of the spherical indentation. It can generally be obtained through calibration tests and is used for stress calculation. It can also be referred to as stress calculation. function.

4 Symbols and descriptions

The symbols and descriptions used in this document are shown in Table 1. Table 1 Symbols and descriptions Symbol Description Unit A0 strain increment under zero stress - A0~A3 Coefficients of strain function- E Elastic modulus GPa of the material being tested ......

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