Test method for bending strength of glass materials

Chinese name: Test method for flexure of glass material English name: Test method for flexure of glass material
Approval unit: National Building Material Industry Bureau Approval Date: 1997-08-22
Implementation Date: 1998-01-01
Standard number: JC / T 676-1997

1 Scope This standard specifies the test method for measuring the bending strength of glass materials. It is suitable for the determination of bending strength of glass and glass-ceramic materials.

2 Test principle Under the specified test conditions, a sample of a certain size and shape is broken by a three-point static bending load. By calculating the maximum bending stress at the cross section of the load, the bending strength of the sample can be obtained.

3 Instruments
3.1 Testing machine
3.1.1 Loading rate. The relative error of load indication should not exceed ± 1%.
3.1.2 The load test should be between 20% and 90% of the range of the testing machine.
3.1.3 The size of the indenter blade should meet the requirements of Figure 1. Both the support used to support the sample and the indenter used to apply load are made of hardened steel, and the amount of elastic mold of the material should not be less than 200GP to prevent load When excessive, plastic deformation occurs, and the surface roughness of the part in contact with the sample should not be greater than 1.6 μm.
3.2 Measuring tool vernier caliper or micrometer with an accuracy of 0.02mm.

4 Sample
4.1 The sample is 120mm ± 1mm ​​long. The cuboid with a width of 20mm ± 1mm ​​and the original plate thickness as the thickness of the sample has four corners of 900 ± 0.50. The appearance of the sample should be free of obvious defects such as burst edges, missing corners and scratches, and the cutting edges are on the same surface.
4.2 No less than 15 samples per group.

5 Test procedures
5.1 Use a vernier caliper or micrometer to measure the width and thickness of the middle of the sample to the nearest 0.05mm.
5.2 Adjust the distance between the two fulcrums to 100 mm.
5.3 Place the sample with the cutting edge side up on the support. The distance between the two ends of the support should be equal.
5.4 At the load point of the sample, load at a displacement speed of 5 mm / min, and record the maximum load when the sample breaks.
5.5 Fracture should occur in the middle part of the sample in three equal parts, otherwise the test should be replaced with a new sample to ensure the original number of samples in each group.
5.6 After each sample is broken, use a brush or soft cloth to carefully clean the indenter and support. To remove broken glass slag.

6 Result calculation
6.1 The single value of the bending strength of the sample is calculated according to formula (1):
……………………………(1)
In the formula: ——Bending strength of the sample, Mpa
P——the maximum load when the specimen breaks, N;
L——distance between sample supports, mm;
b—— Width of sample, mm;
d——The thickness of the sample, mm.
6.2 The standard deviation is calculated according to formula (2):
S = ………………………… (2)
In the formula: S——standard deviation, Mpa;
n——the number of valid samples tested;
——Bending strength of each sample, Mpa.
6.3 Perform data processing according to Appendix A (standard appendix), expressed as the arithmetic mean and standard deviation of valid data. Take 3 significant digits.

7 Test report The bending strength test report shall include the following:
a) Entrusted unit;
b) Sample name, specification and number;
c) The width and thickness of each sample, the maximum load at break;
d) Single value, average value and standard deviation of specimen bending strength;
e) Model of the sample machine and the selected range;
f) Test unit and personnel;
Test date.

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