GB/T 12160-2019 English PDF (GBT12160-2019)

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GB/T 12160-2019: Metallic materials -- Calibration of extensometers systems used in uniaxial testing
GB/T 12160-2019
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 and
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.
Metallic Materials - Calibration of Extensometers Systems
Used in Uniaxial Testing
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.
2.1 Extensometer System
equipment used to measure displacement or strain on the surface of a test piece.
NOTE: for the purpose of this Standard, the term “extensometer system” includes the indicator.
Some extensometers indicate strain directly (e.g. laser extensometers or digital image
correlation techniques). Other extensometers indicate the change in gauge length of a test
piece; this is converted into strain by dividing by the relevant gauge length.
2.2 Gauge Length
portion of a test piece where extension is measured.
3 Symbols and Designations
Symbols used throughout this Standard are given in Table 1 together with their designation.