GB/T 12160-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12160-2019 | English | 640 |
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Metallic materials - Calibration of extensometers systems used in uniaxial testing
| Valid |
| GB/T 12160-2002 | English | 359 |
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Calibration of extensometers used in uniaxial testing
| Obsolete |
| GB 12160-1990 | English | 399 |
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Standard practice for calibration and classification of extensometers
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 12160-2019
GB/T 12160-2019: Metallic materials - Calibration of extensometers systems used in uniaxial testing
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12160-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.060; 77.040.10
N 74
GB/T 12160-2019 / ISO 9513.2012
Replacing GB/T 12160-2002
Metallic Materials - Calibration of Extensometers Systems
Used in Uniaxial Testing
(ISO 9513.2012, IDT)
Issued on. OCTOBER 18, 2019
Implemented on. MAY 1, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4
Introduction... 5
1 Scope... 6
2 Terms and Definitions... 6
3 Symbols and Designations... 6
4 Principle... 7
5 Calibration Equipment... 7
5.1 Calibration Apparatus... 7
5.2 Calibration Traceability... 8
6 Pre-calibration Inspection... 8
6.1 Objective... 8
6.2 Records of the Inspection... 8
6.3 Identification of Extensometer System Elements... 8
7 Measurement of Extensometer Gauge Length... 9
7.1 Fixed Gauge Length Extensometry... 9
7.2 Variable Gauge Length Extensometry... 9
7.3 Non-contacting Extensometry... 10
7.4 Extensometer Gauge Lengths Established Using Setting Gauges... 10
8 Calibration Process... 10
8.1 Environmental Considerations... 10
8.2 Position of the Extensometer... 11
8.3 Calibration Increments... 11
8.4 Calibration Process... 12
8.5 Determination of the Characteristics of the Extensometer System... 13
9 Classification of the Extensometer System... 14
9.1 Input Data... 14
9.2 Analysis of the Data... 14
9.3 Classification Criteria... 14
9.4 Assessment of the Results... 15
10 Uncertainty Determination... 15
10.1 Uncertainty of the Calibration... 15
10.2 Uncertainty Budget Determination... 16
11 Extensometer System Calibration Intervals... 16
12 Calibration Certificate... 16
12.1 Mandatory Information... 16
12.2 Data Presentation... 17
Annex A (informative) Uncertainty of Measurement... 18
Annex B (informative) Calibration of the Calibration Apparatus... 24
Annex C (informative) Example of a Report of the Calibration of Calibration Apparatus
... 27
Annex D (informative) Examples of Extensometer System Configurations... 30
Annex E (informative) Laser Extensometry... 40
Annex F (informative) Video Extensometry... 49
Annex G (informative) Full Field Strain Measurement Video Extensometry... 54
Annex H (informative) Calibration of a Cross-head Measurement System... 57
Bibliography... 58
Foreword
This Standard was drafted in accordance with the rules provided in GB/T 1.1-2009.
This Standard serves as a replacement for GB/T 12160-2002 Calibration of Extensometers
Used in Uniaxial Testing. In comparison with GB/T 12160-2002, apart from editorial
modifications, the main technical changes are as follows.
---Terms and definitions are added (see Chapter 2);
---Pre-calibration inspection is added (see Chapter 6);
---Uncertainty determination is added (see Chapter 10);
---Annex A “Example of Extensometer Calibration Range” and Annex B “Parameters for
Extensometer Classification” are deleted (see Annex A and Annex B of Version 2002);
---Informative Annexes are added (see Annex A, Annex B, Annex C, Annex D, Annex E,
Annex F, Annex G and Annex H).
This Standard uses the translation method in the equivalent adoption of ISO 9513.2012 Metallic
Materials - Calibration of Extensometer Systems Used in Uniaxial Testing.
This Standard makes the following editorial modification.
---This Standard includes ISO 9513.2012_Cor 1 and corrects some contents of Figure C.1
and Figure C.2.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee 122 on Testing
Machines of Standardization Administration of China (SAC/TC 122).
The drafting organizations of this Standard. SINOTEST Equipment Co., Ltd.; Central Iron &
Steel Research Institute; Wuxi Institute of Measurement and Testing; Shenzhen WANCE testing
Machine Co., Ltd.; Jilin University; Jilin Institute of Metrology.
The main drafters of this Standard. Yang Zhengwang, Chen Wu, Chen Chao, An Jianping,
Zhang Shizhong, Han Dandan, Zhao Hongwei.
The issuing of the previous versions.
---GB 12160-1990, GB/T 12160-2002.
1 Scope
This Standard specifies a method for the static calibration of extensometer systems used in
uniaxial testing, including axial and diametral extensometer systems, both contacting and non-
contacting.
2 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
equipment used to measure displacement or strain on the surface of a test piece.
3 Symbols and Designations
Symbols used throughout this Standard are given in Table 1 together with their designation.
4 Principle
The calibration of extensometer systems involves a comparison of the readings given by the
extensometer with known variations in length provided by a calibration apparatus.
5 Calibration Equipment
The calibration apparatus, which allows a known displacement lt to be applied to the
extensometer, may consist of a rigid frame with suitable coaxial spindles or other fixtures to
which the extensometer can be attached. The calibration apparatus shall comprise a mechanism
for moving at least one of the axial spindles together with a device for accurately measuring the
change in length produced.
6 Pre-calibration Inspection
Records of the pre-calibration inspection shall be kept, identifying the “as-found” condition of
the extensometer system, when the inspection was performed and who performed it. These pre-
calibration inspection records can take the form of either a written report or a completed “pro-
forma” checklist.
7 Measurement of Extensometer Gauge Length
The gauge length for non-contacting extensometry is established in accordance with the
manufacturer’s instructions.
Where an extensometer gauge length is set using a removable gauge, the relative error on the
gauge length, qLe, calculated from Formula (1) shall not exceed the values given in Table 2.
8 Calibration Process
The extensometer shall be placed, wherever feasible, in the calibration apparatus in a similar
orientation to that in which it will be used during uniaxial testing to avoid errors due to loss of
equilibrium or to deformation of any part of the extensometer.
The extensometer shall be attached in a similar way as during uniaxial testing.
9 Classification of the Extensometer System
The required input data for the classification of the extensometer system are.
The collated data are assessed as follows.
10 Uncertainty Determination
Many elements contribute to the uncertainty of the calibration process. The following shall be
assessed and incorporated into the uncertainty budget calculation.
11 Extensometer System Calibration Intervals
11.1 The time between two calibrations depends on the type of extensometer system, the
maintenance standard and the number of times the extensometer system has been used. Under
normal conditions, it is recommended that calibration be carried out at intervals of
approximately 12 months.
12 Calibration Certificate
The calibration certificate shall contain at least the following information.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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