GB/T 38686-2020Test method for flexibility of ultrathin glass—Two point bending method (English PDF)
超薄玻璃柔韧性试验方法 两点弯曲法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 31, 2020
Implementation date
February 1, 2021
Scope
GB/T 38686-2020 is the English-translated version of 超薄玻璃柔韧性试验方法 两点弯曲法.
GB/T 38686-2020 is the Chinese standard "Test method for flexibility of ultrathin glass - Two point bending method".
Its scope clause reads: This Standard specifies the terms and definitions, test principles, test device, environmental conditions, sample requirements, test steps, result calculation and expression, and test reports for measuring the flexibility of ultrathin glass by the two point bending method.
This Standard applies to the test of the flexibility of ultrathin glass. Its clauses include terms and definitions; test principle; test device; environmental conditions; sample requirements; test steps; results calculation and expression; test report.
It was issued by the State Administration for Market Regulation on MARCH 31, 2020 and took effect on FEBRUARY 01, 2021.
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Document preview — GB/T 38686-2020
National Standard of the People's Republic of China
- ICS
- 81.040.01
- Classification
- Q 34
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Test principle5
- 5 Test device5
- 6 Environmental conditions6
- 7 Sample requirements6
- 8 Test steps7
- 9 Results calculation and expression8
- 10 Test report8
1 Scope
This Standard specifies the terms and definitions, test principles, test device, environmental conditions, sample requirements, test steps, result calculation and expression, and test reports for measuring the flexibility of ultrathin glass by the two point bending method.
This Standard applies to the test of the flexibility of ultrathin glass.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 9056, Metal ruler
GB/T 21389, Vernier, dial and digital display calipers
GB/T 34171, Test method for flexural property of thin and ultrathin glass - Three-point bending method
3 Terms and definitions
Terms and definitions determined by GB/T 34171 and the following ones are applicable to this document.
3.1 Ultrathin glass
Plate glass products whose thickness is not greater than 1.1 mm.
3.2 Critical radius of curvature
When the ultrathin glass is bent and deformed to the moment of damage by the action of two points, the minimum radius of curvature corresponding to the complete bending trajectory.
3.3 Flexibility
g) Other samples are tested according to steps e) ~ f).
9 Results calculation and expression
9.1 Result calculation
The critical radius of curvature R, which is calculated according to Formula (1), is reserved to an integer.
Where:
R -- the average critical radius of curvature of the sample, in millimeters (mm);
R1, R2,..., Rn -- critical radius of curvature of the sample, in millimeters (mm); n -- number of test samples.
9.2 Result expression
The measurement result is expressed as RT = R, where T is the thickness of the sample, in millimeters; two decimal places are retained.
Example: R0.50 = 200 mm means that for an ultra-thin glass sample whose thickness is 0.50 mm, the critical radius of curvature of bending failure is 200 mm.
10 Test report
The test report shall at least include the following contents:
a) standard (code of this Standard);
b) species and name of sample glass;
c) sample length, width and thickness;
d) number of samples;
e) test ambient temperature;
f) test results and relative standard deviation;
g) inspector, auditor, date;
h) other relevant information. […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 21389-2008 — Vernier, dial and digital display calipers
GB/T 34171-2017 — Test method for flexural property of thin and ultrathin glass—Three-point bending method
GB/T 9056-2004 — Metal ruler
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