GB/T 37900-2019Test method of hardness and fracture toughness for ultra-thin glass—Low-load vickers hardness indentation method (English PDF)

1 Scope

This standard specifies the hardness and fracture toughness of ultra-thin glass measured by Vickers indentation method with loading force of 1.961N~49.03N.

Language and definition, test principle, test equipment, specimens, tests, calculation of results, marking and test reports.

This standard is applicable to the hardness test of glass with a thickness of 0.1mm~1.1mm and the breakage of glass with a thickness of 0.3mm~1.1mm.

Crack toughness test.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 4340.2 Vickers hardness test for metallic materials - Part 2. Examination and calibration of durometer

GB/T 16534 fine ceramics room temperature hardness test method

3 Terms and definitions

The following terms and definitions apply to this document.

4 Test principle

A square tapered diamond indenter with an angle of 136° on the opposite side is pressed into the surface of the specimen at a given test pressure and maintained at the specified

After the time, the test force is removed, and the length of the two diagonal lines of the indentation and the length of the diagonal crack propagation of the indentation are measured by a microscope, according to a given meter.

Calculate the formula and calculate the hardness and fracture toughness of the sample surface. The schematic diagram of the test principle is shown in Figure 1. The indentation morphology and diagonal and diagonal cracks

The schematic diagram of the length measurement is shown in Figure 2.