GB/T 16825.1-2022Metallic materials - Calibration and verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Calibration and verification of the force-measuring system (English PDF)

Foreword

This document is drafted in accordance with GB/T 1.1-2020 "Directives for

standardization - Part 1.Rules for the structure and drafting of standardizing

documents".

This document is Part 1 of GB/T 16825 "Metallic materials - Calibration and

verification of static uniaxial testing machines". GB/T 16825 has issued the following

parts.

- Part 1.Tension/compression testing machines - Calibration and verification of the

force-measuring system;

- Part 2.Tension creep testing machines - Verification of the applied force.

This document replaces GB/T 16825.1-2008 "Verification of static uniaxial testing

machines - Part 1.Tension/compression testing machines - Verification and calibration

of the force-measuring system". Compared with GB/T 16825.1-2008, in addition to

structural adjustments and editorial changes, the main technical changes are as follows.

- Change the scope of application of the document; add verification requirements for

the performance properties of the testing machine to reach the specified class (see

Clause 1; Clause 1 of the 2008 edition);

- Add the term "Verification" (see 3.2);

- Add definitions of symbols such as aF, aZ, bal, deltaF, deltam, deltag, E, E', k, m, qi, qal, qmax,

qmin (see Clause 4);

- Change the representation method of the resolution of numerical indicator (see

6.2.2; 6.2.2 of the 2008 edition);

- Change the determination method of relative resolution (see 6.3; 6.3 of the 2008

edition);

- Change the relevant requirements for calibration methods (see 6.4.4; 6.4.4 of the

2008 edition);

- Change the requirement for calibration below 20% of the measuring force range

(see 6.4.5; 6.4.5 of the 2008 edition);

- Change the requirements for relative indication error, relative repeatability error,

and agreement between two force-proving instruments in the assessment of force

indicator (see 6.5; 6.5 of the 2008 edition).

This document is identical to ISO 7500-1.2018 "Metallic materials - Calibration and

verification of static uniaxial testing machines - Part 1.Tension/compression testing

machines - Calibration and verification of the force-measuring system".

Attention is drawn to the possibility that some of the elements of this document may be

the subject of patent rights. The issuing authority of this document shall not be held

responsible for identifying any or all such patent rights.

This document was proposed by China Machinery Industry Federation.

This document shall be under the jurisdiction of National Technical Committee 122 on

Testing Machines of Standardization Administration of China (SAC/TC 122).

Drafting organizations of this document. Sinotest Equipment Co., Ltd., Zhejiang

Schlikor Test Instrument Manufacturing Co., Ltd., Jinan Xinguang Testing Machine

Manufacturing Co., Ltd., MTS Systems (China) Co., Ltd., Shenzhen Wance Testing

Machine Co., Ltd., Kunshan Innovation Testing Instruments Co., Ltd., Xi'an Letry

Material Testing Technology Co., Ltd.

Main drafters of this document. Ren Xia, Duan Zhuming, Wang Jianguo, Bai Shuang,

Xiao Congyin, Zhong Xin, Tao Zecheng, Zhang Jianwei, Wang Xuefeng.

The previous releases of this document and the documents it replaces are as follows.

- It was first issued in 1997 as GB 16825-1997; first revised in 2002 as GB/T

16825.1-2002; second revised in 2008;

- This is the third revision.

1 Scope

This document specifies the calibration and verification method of tension/compression

testing machines.

2 Normative references

The contents of the following documents, through normative references in this text,

constitute indispensable provisions of this document. Among them, for dated references,

only the edition corresponding to that date applies to this document. For undated

references, the latest edition (including all amendments) applies to this document.

ISO 376 Metallic materials - Calibration of force-proving instruments used for the

verification of uniaxial testing machines

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

Confirmation, in accordance with the provisions of this document, that the performance

properties of the testing machine achieve the limits given for a specified class.

4 Symbols

The following symbols and their meanings apply to this document (see Table 1).

5 General inspection of the testing machine

The calibration of the testing machine shall only be carried out if the machine is in good

working order. For this purpose, a general inspection of the machine shall be carried

out before calibration of the force-measuring system of the machine as indicated in

Annex A.

6 Calibration of the force-measuring system of the testing machine

The thickness of the graduation marks on the scale shall be uniform and the width of

the pointer shall be approximately equal to the width of a graduation mark.

The resolution, r, shall be expressed in units of force.

7 Class of testing machine range

Table 2 gives the maximum permissible values for the different relative errors of the

force-measuring system and for the relative resolution of the force indicator, which

characterize a testing machine range in accordance with the appropriate class.

8 Verification report

The verification report shall contain at least the following information.

The results of verification shall mention.

9 Intervals between verifications

The time between two verifications depends on the type of testing machine, the standard

of maintenance and the amount of use. Unless otherwise specified, it is recommended

that verification be carried out at intervals not exceeding 12 months.

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