GB/T 15726-2021_English: PDF (GB/T15726-2021)
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Glassware -- Stress examination methods
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GB/T 15726-2021
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| 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Count Estimation | 6,690 | | Date of Issue | 2021-08-20 | | Date of Implementation | 2022-03-01 | | Older Standard (superseded by this standard) | GB/T 15726-1995 | | Drafting Organization | National Light Industry Glass Product Quality Supervision and Testing Center | | Administrative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 | | Standard ID | GB/T 15726-1995 (GB/T15726-1995) | | Description (Translated English) | Glassware. stress examination methods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | N64 | | Classification of International Standard | 71.040.20 | | Word Count Estimation | 5,596 | | Date of Issue | 1995/10/24 | | Date of Implementation | 1996/7/1 | | Drafting Organization | Light Industry Association glassware Quality Supervision and Testing Center | | Administrative Organization | National Glass Instrument Standardization Technical Committee | | Proposing organization | China Light Industry Association | | Issuing agency(ies) | State Bureau of Technical Supervision | | Summary | This standard specifies the principles of the glassware stress tests, samples, equipment, procedures, calculations, report content. This standard applies to the glassware after annealing stress test. |
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.
......
GB/T 15726-1995
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.20
N 64
Glassware - Stress examination methods
ISSUED ON. OCTOBER 24, 1995
IMPLEMENTED ON. JULY 01, 1996
Issued by. State Bureau of Technical Supervision
Table of Contents
1 Subject content and scope of application ... 3
2 Principle ... 3
3 Specimen ... 3
4 Instruments ... 4
5 Testing procedures ... 4
6 Representation of test results ... 6
7 Testing report ... 7
Additional information ... 7
Glassware - Stress examination methods
1 Subject content and scope of application
This standard specifies the principle, specimen, instrument, procedure,
calculation method and report content of the stress examination of glassware.
This standard applies to the stress examination of glassware after annealing.
2 Principle
Usually glass is an isotropic homogeneous material. When stress exists, it will
exhibit anisotropy and produce birefringence of light. The optical path difference
of birefringence ΔS has a relationship with stress.
Where.
ΔS - The optical path difference of birefringence;
σ - The difference of the two principal stresses perpendicular to the direction
of light propagation, N/mm2;
K - The stress optical constant of glass, 10-6 mm2/N;
d - The length (thickness) of optical path in the glass specimen, cm.
The stress optical constant K of the same type of glass is the same, so it may
use the difference of optical path per unit thickness to express the magnitude
of the stress. This standard specifies the measurement method of using the
polarized stress meter to measure the difference of optical path, as well as
using the difference of optical path per unit thickness to indicate the internal
stress of the product.
3 Specimen
3.1 The specimen shall be a glass instrument that has not been tested after
annealing.
3.2 Specimen must be placed in the laboratory in advance for more than 30
minutes.
5.4.1.1 Place the sample to be tested into the dark field of view wherein a
quarter-wave plate is placed, observe the bottom from the mouth. At this time,
a dark cross will appear in the field of view. If the stress of the specimen is small,
then the dark cross is blurred.
5.4.1.2 Rotate the analyzer to separate the dark cross into two arcs moving in
opposite directions. As the dark area moves outward, the concave side of the
arc will appear blue-gray. Continue to rotate the analyzer until the blue-gray is
just replaced by brown.
5.4.1.3 Rotate the specimen around the axis to find the maximum stress point,
rotate the analyzer until the blue-gray is replaced by brown, record the angle of
rotation of the analyzer as well as the thickness of the point.
5.4.2 Measurement of sample walls or similar walls
5.4.2.1 Place the sample into the field of view, so that the axis of the sample is
at 45° with the plane of polarization. At this time, there will be different areas of
light and dark on the sample wall, select the brightest point, which is the
maximum stress point.
5.4.2.2 Rotate the analyzer, until the dark area on the wall is converging to
completely replace the bright area. Read the angle of rotation of the analyzer
and rotate the sample slightly along the axis. If the converged dark area is
stable in brightness, the wall thickness of the two layers of glass is the length
of its optical path.
5.4.2.3 If the brightness of the converged dark area changes indefinitely, find a
reference area nearby, which shall have a small or constant optical path
difference or both, then follow clause 5.4.2.2 to determine the optical path
difference of the reference area, then slightly tilt it to make the light pass through
the wall thickness of one layer of reference area and one layer of tested area;
use the obtained optical path difference to minus 1/2 of the optical path
difference of the reference area, to obtain the optical path difference of the
single-layer wall of the measured part. If the oblique angle from the vertical is
greater than 10°, it shall follow the diagram below to calculate the actual optical
path.
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