GB/T 37900-2019 in English
VALIDTest method of hardness and fracture toughness for ultra-thin glass—Low-load vickers hardness indentation method
- Issued on:2019-08-30
- Implemented on:2020-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 37900-2019超薄玻璃硬度和断裂韧性试验方法 小负荷维氏硬度压痕法》由TC447（全国工业玻璃和特种玻璃标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
1. Background and purpose of the standard
National Standard of the People's Republic of China GB/T 37900-2019 "Test Method for Hardness and Fracture Toughness of Ultra-thin Glass - Small Load Vickers Hardness Indentation Method" aims to provide unified technical specifications for the hardness and fracture toughness testing of ultra-thin glass. This standard was proposed by the China Building Materials Federation and is managed by the National Technical Committee for Standardization of Industrial Glass and Special Glass.
2. Scope of application of the standard
This standard applies to ultra-thin glass with a thickness of $0.1\mathrm{mm} \sim 1.1\mathrm{mm}$. Specifically:
- Hardness test: Applicable to ultra-thin glass with a thickness of $0.1\mathrm{mm} \sim 1.1\mathrm{mm}$.
- Fracture toughness test: Applicable to ultra-thin glass with a thickness of $0.3\mathrm{mm} \sim 1.1\mathrm{mm}$.
3. Standard framework comparison table
| Technical requirements | Hardness test | Fracture toughness test |
|---|---|---|
| Test equipment | Vickers hardness tester | Vickers hardness tester + crack measurement device |
| Test force range | $1.961~\mathrm{N} \sim 49.03~\mathrm{N}$ | $1.961~\mathrm{N} \sim 49.03~\mathrm{N}$ |
| Indentation diagonal length | d₁, d₂ | d₁ + d₂ and crack extension length is 2c₁, 2c₂ |
4. Implementation suggestions and operating specifications
4.1 Hardness test implementation steps
- Equipment calibration: Use GB/T 4340.2 standard to calibrate the Vickers hardness tester to ensure that the test force error does not exceed ±1.0%.
- Specimen preparation: Cut the ultra-thin glass into square specimens with a side length of $30~\mathrm{mm} \sim 50~\mathrm{mm}$ to avoid edge damage.
- Test conditions: Control the test temperature at $10^\circ\mathrm{C} \sim 35^\circ\mathrm{C}$ to ensure a stable environment.
4.2 Fracture toughness test precautions
- Indentation crack generation: Ensure that cracks are generated at the four vertices of the indentation, and the crack length must meet the maximum value that does not exceed the glass thickness.
- Measurement accuracy: The magnification of the reading microscope is not less than $50\times$, and the measurement accuracy is not less than $0.1~\mu\mathrm{m}$.
5. Result calculation and marking
Vickers hardness and indentation fracture toughness are calculated according to the standard formula:
- Vickers hardness: $\mathrm{HV} = 0.007416 \cdot \frac{F}{(d₁ + d₂)^2}$
- Indentation fracture toughness: $\mathrm{IFR} = 0.026 \cdot \left[ E \cdot \frac{F}{(2c₁ + 2c₂)/4} \right]^{1/2} \cdot \frac{d₁ + d₂}{2c₁ + 2c₂}$
The marking method uses $\mathrm{HV}$ respectively. and $\mathrm{IFR}$ symbols, and indicate the test force value.
6. Test report requirements
The test report should include the following information:
- Name of the standard used
- Test date, report number and test user information
- Name and address of the testing organization
- Material name and specimen thickness
- Test force value and test results
- Total number of indentations and effective number of indentations
- Environmental conditions (temperature)
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