GB/T 3075-2021 English PDF (GB/T3075-2021)

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GB/T 3075-2021: Metallic materials -- Fatigue testing -- Axial force-controlled method
GB/T 3075-2021
Metallic materials - Fatigue testing - Axial force-controlled method
ICS 77.040.10
CCSH22
National Standards of People's Republic of China
Replace GB/T 3075-2008
Axial force control method for fatigue test of metallic materials
(ISO 1099.2017, MOD)
Released on 2021-08-20
2022-03-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Test plan 3
5 Sample 7
6 Test device 13
7 Test and monitoring equipment 14
8 Verification and calibration 14
9 Clamping of the specimen 14
10 Test frequency 15
11 Application of force 15
12 Temperature and humidity record 15
13 Failure criterion and test termination 15
14 Test report 15
Appendix A (informative) The chapter number of this document is compared with the ISO 1099.2017 chapter number 17
Reference 19
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document replaces GB/T 3075-2008 "Metallic Material Fatigue Test Axial Force Control Method", and is similar to GB/T 3075-2008
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
---Added test purpose and Note 2 (see Chapter 1);
---Added two terms and definitions of "clamping end diameter" and "specimen length" (see Chapter 3);
--- Deleted the coaxiality requirements and the corresponding diagrams (see 4.2.3 and Figure 9 in the.2008 edition);
---Changed the circular cross-section sample and the rectangular cross-section sample (see Figure 7 and Figure 8, Figure 3 and Figure 4 of the.2008 edition);
---Added the description of the funnel sample (see 5.1);
--- Modify the "Changes in Material Microstructure" and "Effects of Pollutants" in the sample processing flow to note (see 6.3.1,.2008 edition
5.3.2.2 and 5.3.2.3);
--- Added a schematic diagram of the test fixture design (see Figure 9 in Chapter 5).
This document uses the redrafting method to modify and adopt ISO 1099.2017 "Metallic Material Fatigue Test Axial Force Control Method".
Compared with ISO 1099.2017, this document has many structural adjustments. Appendix A lists the chapters of this document and ISO 1099.2017.
Article number comparison list.
Compared with ISO 1099.2017, this document has technical differences.
The vertical single line (丨) of the setting is marked, and the specific technical differences and their reasons are as follows.
---Regarding normative reference documents, this document has made adjustments with technical differences to adapt to my country's technical conditions and adjustments
It is concentratedly reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows.
● Replace ISO 4965-1 (see 6.1) with GB/T 25917.1 which is equivalent to adopting international standards;
● Replace ISO 7500-1 (see 6.1) with GB/T 16825.1 equivalent to the international standard;
● Replace ISO 23788 (see 6.2) with GB/T 34104 modified to adopt international standards;
● Added reference to JJG556 (see 6.1).
--- Increased the coaxiality requirements of the testing machine (see 6.2).
This document has made the following editorial changes.
---Add the description of Smax and Smin in Figure 1;
--- Table 1 has been added, and the requirements for the geometric dimensions of the specimens listed in the International Standard 6.1 are expressed in the form of a table.
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
Drafting organizations of this document. Central Iron and Steel Research Institute, China Machinery Testing Equipment Co., Ltd., Lishi (Shanghai) Scientific Instrument Co., Ltd., Southwest
Jiaotong University, Shenzhen Wance Test Equipment Co., Ltd., Metallurgical Industry Information Standards Research Institute, and NCS Chengdu Testing and Certification Co., Ltd.
The main drafters of this document. Gao Yifei, Sun Baorui, Wang Bin, Wu Shengchuan, Dong Li, Huang Xing, Yang Xiuguang, Hou Huining.
This document was first published in 1982, revised for the first time in.2008, and this is the second revision.
introduction
The purpose of this document is to provide fatigue life data (for example, stress to failure
Number of cycles).
Clamp the specimens with the same nominal size on the axial force fatigue testing machine, and apply any of the types shown in Figure 1 to the specimens.
Cyclic stress. Unless otherwise specified, the test waveform should be a sine curve of equal amplitude.
The applied force is along the longitudinal axis of the sample and passes through the axis of each sample cross section. The test continues until the sample fails or until the
To more than one pre-set stress cycle cycle (see Chapter 4 and Chapter 13). The test is generally carried out at room temperature (10℃~35℃).
Refer to this standard for high temperature and low temperature tests.
Note. The results of the fatigue test may be affected by atmospheric conditions, so it is required to control the required test conditions in accordance with ISO 554.1976 2.1.
Indexing serial number description.
X --- time;
Y ---stress;
Smax ---Maximum stress, N/mm2;
Smin --- minimum stress, N/mm2;
1 ---Pulsation compression;
2 ---Cyclic tension and compression;
3 ---Pulsating stretching.
Figure 1 Types of cyclic stress
Axial force control method for fatigue test of metallic materials
1 Scope
This document specifies the conditions for the axial constant-amplitude force controlled fatigue test of metallic material specimens (without stress concentration introduced) at room temperature. Use this
When documenting, the purpose of the test is to provide fatigue information, such as applying stress under different stress ratios and given material conditions (such as hardness and microstructure)
The relationship with the number of failure cycles.
This document is applicable to the axial force control fatigue test of circular and rectangular cross-section specimens, and the inspection of product components and other special-shaped specimens.
The test is not included.
Note 1.Since the shape and size of notched specimens are not standardized, this document does not include fatigue tests for notched specimens. However, the fatigue described in this document
The labor test process can be applied to the fatigue test of notched specimens.
Note 2.This document uses engineering stress, which is defined as the ratio of the axial force to the original cross-sectional area of the specimen at the test temperature.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 16825.1 Inspection of static uniaxial testing machine Part 1.Inspection and test of force measuring system of tensile and (or) compression testing machine
Calibration (GB/T 16825.1-2008, ISO 7500-1.2004, IDT)
GB/T 25917.1 Uniaxial fatigue test system Part 1.Dynamic force calibration (GB/T 25917.1-2019, ISO 4965-1.
2012, IDT)
GB/T 34104 Metal material testing machine loading coaxiality inspection (GB/T 34104-2017, ISO 23788.2012,
MOD)
JJG55.6 Axial Force Fatigue Testing Machine
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Sample diameter testspecimendiameter
The diameter of the specimen or test piece at the maximum stress.
3.2
Grip diameter
Diameter of the specimen holding end.
3.3
Thicknessoftestsection