GB/T 18144-2008 PDF English
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| GB/T 18144-2008 | English | 70 |
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Test method for measurement of stress in glass
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| GB/T 18144-2000 | English | 319 |
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Test method for measurement of stress in glass
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GB/T 18144-2008: Test method for measurement of stress in glass---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/GBT18144-2008
GB
ICS 81.040.20
Q 33
NATIONAL STANDARD
GB/T 18144-2008
Replacing GB/T 18144-2000
Test method for measurement of stress
in glass
Issued on. OCTOBER 15, 2008
Implemented on. JUNE 1, 2009
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China
GB/T 18144-2008
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Test Method... 5
GB/T 18144-2008
Foreword
The consistency of this standard with the ASTM standard ASTM C1279-05 Test Method for
Non-Destructive Photoelastic Measurement of Surface and Edge Stresses in Annealed Glass,
Half-Toughened Glass, and Toughened Glass, ASTM C1048-04 Heat-Strengthened Flat
Glass-HS Class, FT Class Coating and Non-Coating Glass, and Japanese industrial
technology standard JIS R3222-2003 Half-Toughened glass IS NOT equivalent.
This standard replaces GB/T 18144-2000 Test method for measurement of stress in glass.
This standard, in comparison with GB/T 18144-2000, has the major changes as follows.
— In Chapter “Scope”, ADD laminated glass used in car’s front windshield and hot
bending glass, DELETE annealed glass;
— ADD nondestructive test method for measurement of edge stress in glass with
coating;
— Specific values of instrument constants of the surface stress meter and edge stress
meter are not described in the standard.
This Standard was proposed by China Building Materials Federation.
This standard shall be centralized by the National Architectural Glass Standardization
Technical Committee.
Drafting organization of this standard. China Building Material Test & Certification Center.
The main drafters of this standard. Xiao Pengjun, Wang Jingjing, and Lu Fan.
The previous version replaced by this standard is as follows.
— GB/T 18144-2000.
GB/T 18144-2008
Test method for measurement of stress in glass
1 Scope
This standard specifies the definitions and methods related to the tests on surface stress
and edge stress of glass. In this standard, the method of surface stress test is suitable for
toughened glass and half-toughened glass made of float glass. The method of edge
stress test is fit for toughened glass, half-toughened glass, laminated glass of car’s front
windshield, and hot bending glass.
For chemical toughened glass, it may refer to the method of surface stress test in this
standard.
This test method is a nondestructive test method.
2 Normative references
The articles contained in the following documents have become part of this standard when
they are quoted herein. For the dated documents so quoted, all the modifications
(excluding corrections) or revisions made thereafter shall not be applicable to this
Standard. For the undated documents so quoted, the latest edition shall be applicable to
this Standard.
JC/T 632 Road vehicles - Safety glazing materials - Terminology
3 Terms and definitions
For the purpose of this standard, the following terms and definitions and those defined in
JC/T 632 apply.
3.1
Polarizer
A kind of optical device, through which natural light becomes plane-polarized light with a
certain vibration direction, and which is usually placed between the light source and
samples under test.
GB/T 18144-2008
4 Test Method
4.1 Surface stress measurement
4.1.1 Measurement principle
The testing principle of surface stress meter is to use optical waveguide effect of the tin
diffusion layer on the surface of float glass to measure. The scattered light, emitted from a
light source (incandescent light bulb) and through a slit, turns into parallel light after being
converged by cylindrical prism of a high refractive index.
4.1.2 Reagents for test
Refraction oil. Its refractive index shall be greater than the glass but not greater than the
instrument prism. Refraction oil shall not have a corrosive effect on the instruments.
4.1.4 Preparation and preservation of sample
Use finished products as the sample. If there is coating on the surface of the tin diffusion
layer of the sample (such as curtain wall glass, glaze coating of car’s back windshield
glass), use hydrofluoric acid or abrasive cloth to remove it. And take the area where the
coating is removed as the stress testing point of the sample. In order to avoid the
generation of thermal stress, the temperature inside and outside the sample must be
consistent and same as the ambient temperature.
4.1.6 Test procedures
a) The tin diffusion layer of the sample to be measured shall be placed upwards and
horizontally at a stable state;
b) Wipe and clean the glass surface. And drop 1 ~ 2 drops of refraction oil on the
testing point;
c) Make the instrument prism parts to contact with the measuring points reliably;
d) Adjust the light source position, the slit position and the retro-reflector angle to
ensure a clear image with light-shade stairs appear in the observation field;
e) Use the micrometer eyepiece to read the height of the stair d, accurate to 0.01 mm;
f) Compressive stress and tensile stress shall be determined by Figure 2.
4.2 Measurement of edge stress of glass without coating
4.2.1 Measurement principle
Put the sample in a plane polarized light field. Rotate the polarizer and analyzer to keep
their polarization axes orthogonal to each other and 45° to the direction of the sample’s
principal stress which is parallel or vertical to the edge of the sample. Put a 1/4 wave plate
in the left light path close to the analyzer. And make it parallel to its fast axis, slow axis and
polarization axis. Compensate by rotating the analyzer to obtain the compensation angle.
4.2.5 Test procedures
4.2.6 Test results calculation
Edge stress is calculated by Formula (4).
4.2.7 Test Report
The report shall include the following contents.
4.3 Test of edge stress of glass with coating
4.3.1 Principles of test
Use reflective light path to put the concentrator system, the polarizer and the analyzer
receiving reflective light on the same side of the sample, so as to ensure that the polarized
light can be reflected back by the coating on the back of the glass after entering into the
glass, and then going through the glass sample under test. The testing principle of this
test method is same as 4.2.1.And the only difference is that the polarized light passes
through the glass sample under test twice from the direction of the thickness of the glass.
4.3.2 Test device
Reflective edge stress gauge. It is mainly consisted of four parts, namely, concentrator
system, polarizer, analyzer, and 1/4 wave plate. The instrument structure is shown in
4.3.3 Sample
Use the finished product as sample. The edge on one side of it shall be coated (such as
curtain wall glass, glaze surface of car’s shatter-proof glass). In order to avoid the
generation of thermal stress, the temperature inside and outside the sample must be
consistent and be same with the ambient temperature.
4.3.4 Determination of the edge stress measuring points
Same as 4.2.4.
4.3.5 Test procedures
Test procedures are as follows.
4.3.6 Test results calculation
Edge stress shall be calculated according to Formula (5) and (6).
4.3.7 Test Report
Same as 4.2.7.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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