GB/T 15726-2021 (GB/T15726-2021, GBT 15726-2021, GBT15726-2021)
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Glassware -- Stress examination methods
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GB/T 15726-2021
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Standards related to: GB/T 15726-2021
| Standard ID | GB/T 15726-2021 (GB/T15726-2021) | | Description (Translated English) | Glassware -- Stress examination methods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | N64 | | Classification of International Standard | 81.040.01 | | Word Count Estimation | 6,690 | | Date of Issue | 2021-08-20 | | Date of Implementation | 2022-03-01 | | Older Standard (superseded by this standard) | GB/T 15726-1995 | | Drafting Organization | National Light Industry Glass Product Quality Supervision and Testing Center | | Administrative Organization | National Glass Instrument Standardization Technical Committee (SAC/TC 178) | | Proposing organization | China National Light Industry Council | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 15726-2021
Glassware - Stress examination methods
ICS 81.040.01
CCSN64
National Standards of People's Republic of China
Replace GB/T 15726-1995
Test method for internal stress of glass instrument
Released on 2021-08-20
2022-03-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document replaces GB/T 15726-1995 "Internal Stress Test Method for Glass Apparatus". Compared with GB/T 15726-1995, except for editing
The main technical changes in addition to the sexual modification are as follows.
---Added terms and definitions (see Chapter 3);
--- Revise the original standard "Method of presentation of inspection results" to "Calculation of results" (see Chapter 8, Chapter 6 of the.1995 edition).
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed by the China National Light Industry Council.
This document is under the jurisdiction of the National Glass Instrument Standardization Technical Committee (SAC/TC178).
Drafting organization of this document. National Light Industry Glass Product Quality Supervision and Testing Center.
The main drafters of this document. Yuan Chunmei, Du Yuhai, Liang Ye.
The previous versions of this document and the documents replaced are as follows.
---In.1995, it was first published as GB/T 15726-1995;
---This is the first revision.
Test method for internal stress of glass instrument
1 Scope
This document specifies the terms and definitions, principles, specimens, instruments, test procedures, calculation of results, and inspection of internal stress inspection of glass instruments.
report.
This document is applicable to the inspection of the internal stress of the annealed glass instrument.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Polarizer
An optical device through which natural light becomes plane-polarized light with a certain vibration direction.
Note. The polarizer is usually placed between the light source and the test sample, also known as the polarizer.
3.2
Analyzer
An optical device through which natural light becomes plane-polarized light with a certain vibration direction.
Note. The analyzer is usually placed between the observer and the sample being tested, also called analyzer or analyzer.
4 Principle
4.1 Generally, glass is an isotropic homogeneous material. When there is internal stress, it shows anisotropy, resulting in light birefringence.
This method uses a polarization stress meter to measure the birefringence optical path difference, and the value of the birefringence optical path difference per unit thickness is used to express the internal stress of the product.
4.2 The stress optical constants of the same type of glass are the same, and the value of the birefringent optical path difference per unit thickness is used to express the internal stress.
4.3 This method uses a polarization stress meter to measure the birefringent optical path difference, and calculate the internal stress through the birefringent optical path difference.
5 Sample
5.1 The samples should be glassware products without other tests after annealing.
5.2 The sample should be placed in the laboratory for more than 30 minutes in advance.
5.3 Wear gloves during inspection and avoid direct contact with the sample with your hands.
6 Instruments
6.1 When using polarizing elements and protective parts for observation, the brightness of the edge of the light field is not less than 120cd/m2.
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