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GB/T 25917.2-2019: Uniaxial fatigue testing systems -- Part 2: Dynamic calibration device (DCD) instrumentation
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 25917.2-2019 | English | 184 |
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Uniaxial fatigue testing systems -- Part 2: Dynamic calibration device (DCD) instrumentation
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GB/T 25917.2-2019
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Basic data | Standard ID | GB/T 25917.2-2019 (GB/T25917.2-2019) | | Description (Translated English) | Uniaxial fatigue testing systems -- Part 2: Dynamic calibration device (DCD) instrumentation | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | N71 | | Classification of International Standard | 19.060; 77.040.10 | | Word Count Estimation | 10,185 | | Date of Issue | 2019-10-18 | | Date of Implementation | 2020-05-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 25917.2-2019: Uniaxial fatigue testing systems -- Part 2: Dynamic calibration device (DCD) instrumentation
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Uniaxial fatigue testing systems--Part 2. Dynamic calibration device (DCD) instrumentation
ICS 19.060; 77.040.10
N71
National Standards of People's Republic of China
Uniaxial fatigue test system
Part 2. Instruments for dynamic calibration devices
Part 2. Dynamiccalibrationdevice (DCD) instrumentation
[ISO 4965-2..2012, Metalicmaterials-Dynamicforcecalibrationforuniaxial
fatiguetesting-Part 2. Dynamiccalibrationdevice (DCD) instrumentation, IDT)
Published on October 18,.2019
2020-05-01 implementation
State Administration of Market Supervision
Published by China National Standardization Administration
Foreword
GB/T 25917 `` Uniaxial Fatigue Test System '' is divided into the following two parts.
--- Part 1. Dynamic force calibration;
--- Part 2. Instruments for dynamic calibration devices.
This part is the second part of GB/T 25917.
This section is drafted in accordance with the rules given in GB/T 1.1-2009.
This section uses the translation method equivalent to ISO 4965-2..2012 "Dynamic Force Calibration of Uniaxial Fatigue Tests on Metal Materials.
Points. Instruments for dynamic calibration devices.
The following editorial changes have been made in this section.
--- In keeping with the existing standard series, the standard name was changed to `` Uniaxial Fatigue Test System Part 2. For Dynamic Calibration Devices
instrument".
This section is proposed by China Machinery Industry Federation.
This section is under the jurisdiction of the National Testing Machine Standardization Technical Committee (SAC/TC122).
Drafting organizations of this section. Kunshan Innovation Technology Testing Instrument Co., Ltd., Shenzhen Huaxue Testing Co., Ltd., Wuxi Metrology Testing
Institute, Shenzhen Wantest Test Equipment Co., Ltd., China Machine Test Equipment Co., Ltd., Suzhou Dongling Vibration Test Instrument Co., Ltd.
The main drafters of this section. Tao Zecheng, Liu Panchao, Zhang Shenghai, An Jianping, Yang Zhengwang, Tong Ningke, and Lu Jiachen.
Introduction
In dynamic tests, the force on the specimen may differ significantly from the expected force indicated by the test system. Act on the force sensor
The inertial force and the dynamic errors of various electronic devices in the force indicating device will cause errors in the dynamic force. Inertia force equals the mass of the fixture
(Between the force sensor and the specimen) multiplied by the local gravitational acceleration, and therefore also depends on.
a) motion amplitude;
b) exercise frequency;
c) Fixture quality.
The amplitude of motion is in turn determined by the applied force and the mechanical structure of the test system, including the compliance of the load chain, the specimen, the load frame and the installation
basis.
For sine waves, the peak and valley voltage values displayed by the dynamic calibration device are compared with the voltage values generated by the dynamic voltage reference standard.
To simulate laboratory conditions, the sine wave is repeatedly calibrated with a known amount of harmonic distortion to ensure that the instrument used for the dynamic calibration device can accurately measure
The same voltage peak and valley.
4 Basic requirements
4.1 Temperature
The instrument for dynamic calibration should be calibrated in the temperature range of 18 ℃ ~ 28 ℃, and the actual temperature should be recorded.
4.2 Instrument for dynamic calibration device
The dynamic calibration device displays and reads out the output of the dynamic calibration device. When the DC supply voltage of the dynamic calibration device
(VE) is also provided by the instrument for the dynamic calibration device, and the output is mV/V at this time; when the dynamic calibration device is powered by an external power supply,
The output is a simple mV value (the mV value can be converted to a mV/V value by dividing by the external supply voltage). When the dynamic calibration device loses
When a sine variable is displayed (due to the dynamic force applied to the dynamic calibration device), the instrument for the dynamic calibration device will display the peak value of the output
And trough. The resolution of the instrument used in the dynamic calibration device should not be greater than 0.0001mV/V (equivalent to 0.0001VEmV).
4.3 Dynamic Voltage Reference Standard
A variety of DC voltage and sine voltage waveforms (specified by amplitude, frequency, and DC offset) generated by the dynamic voltage reference standard.
Traceability to a voltage standard within a given uncertainty. In addition, in order to allow the performance of the instrument for dynamic calibration
Enough to measure, it can make a specified amount of harmonic distortion superimposed on a sine wave.
The extended uncertainty of the peak and valley voltages generated by the dynamic voltage reference standard (the confidence probability is about 95%) should not be greater than the voltage range
Range (ie, peak voltage minus valley voltage). In the case of DC, the expanded uncertainty of its voltage generation (confidence probability is about
95%) should not be greater than 2VEμV (for example, for an excitation voltage of 10V, the reference standard produces a direct voltage in the range of -20mV ~ 20mV
The deviation of the current voltage is 20μV.
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