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GB/T 16825.1-2022 PDF in English


GB/T 16825.1-2022 (GB/T16825.1-2022, GBT 16825.1-2022, GBT16825.1-2022)
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GB/T 16825.1-2022: PDF in English (GBT 16825.1-2022)

GB/T 16825.1-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.060; 77.040.10
CCS N 71
GB/T 16825.1-2022 / ISO 7500-1:2018
Replacing GB/T 16825.1-2008
Metallic materials - Calibration and verification of static
uniaxial testing machines - Part 1: Tension/compression
testing machines - Calibration and verification of the force-
measuring system
(ISO 7500-1:2018, IDT)
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Introduction ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Symbols... 7 
5 General inspection of the testing machine ... 9 
6 Calibration of the force-measuring system of the testing machine ... 9 
6.1 General ... 9 
6.2 Determination of the resolution ... 11 
6.2.1 Analogue scale ... 11 
6.2.2 Digital scale ... 11 
6.2.3 Variation of readings ... 11 
6.2.4 Unit ... 11 
6.3 Determination of the relative resolution of the force indicator ... 11 
6.4 Calibration procedure ... 12 
6.4.1 Alignment of the force-proving instrument ... 12 
6.4.2 Temperature compensation... 12 
6.4.3 Conditioning of the testing machine and force-proving instrument ... 12 
6.4.4 Calibration methods ... 13 
6.4.5 Application of forces ... 13 
6.4.6 Verification of accessories ... 14 
6.4.7 Verification of the effect of piston positions ... 15 
6.4.8 Determination of indication reversibility error ... 15 
6.5 Assessment of the force indicator ... 16 
6.5.1 Relative indication error ... 16 
6.5.2 Indication repeatability ... 16 
6.5.3 Agreement between two force-proving instruments ... 17 
7 Class of testing machine range ... 17 
8 Verification report ... 18 
8.1 General information ... 18 
8.2 Results of verification ... 18 
9 Intervals between verifications ... 19 
Annex A (Normative) General inspection of the testing machine ... 20 
Annex B (Informative) Inspection of the loading platens of the compression testing
machines ... 21 
Annex C (Informative) Uncertainty of the calibration results of the force-measuring
system ... 22 
Bibliography ... 26 
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, ΔF, Δm, Δg, 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.
Metallic materials - Calibration and verification of static
uniaxial testing machines - Part 1: Tension/compression
testing machines - Calibration and verification of the force-
measuring system
1 Scope
This document specifies the calibration and verification method of tension/compression
testing machines.
The verification consists of:
- a general inspection of the testing machine, including its accessories for the force
application;
- a calibration of the force-measuring system of the testing machine;
- a confirmation that the performance properties of the testing machine achieve a
class.
This document applies to the calibration and verification of the force-measuring system
of tension/compression testing machines.
Note: This document only addresses the static calibration and verification of the force-measuring
systems. The calibration values are not necessarily valid for high-speed or dynamic testing
applications. Further information regarding dynamic effects is given in the Bibliography.
CAUTION - Some of the tests specified in this document involve the use of
processes which can lead to a hazardous situation.
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
Note: GB/T 13634-2019 Metallic materials - Calibration of force-proving instruments used for
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.