GB/T 37780-2019Test method for elastic modulus, shear modulus and Poisson's ratio of glass (English PDF)

1 Scope

This standard specifies the terms and definitions for determining the elastic modulus, shear modulus and Poisson's ratio of glass materials at room temperature by pulse excitation.

Test principle, test equipment, samples, test procedures, calculations and test reports.

This standard applies to glass and glass-ceramic materials.

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 1216 outer diameter micrometer

JC/T 2172 Fine Ceramic Elastic Modulus, Shear Modulus and Poisson's Ratio Test Method Pulse Excitation Method

3 Terms and definitions

The following terms and definitions apply to this document.

4 Test principle

A pulse excitation is applied to the rectangular section beam specimen to cause free vibration. Obtaining the curvature of the sample by fast Fourier transform

The fundamental frequency of the vibration and the fundamental frequency of the torsional vibration, the elastic modulus of the sample is calculated by the fundamental frequency of the bending vibration, and the sample is calculated by the fundamental frequency of the torsional vibration.

The shear modulus and Poisson's ratio are calculated from the relationship between the elastic modulus and the shear modulus.

Note. Since the fundamental frequency of the vibration of the specimen depends on the size, mass and elastic modulus of the specimen, in the case where the mass and size of the specimen are known, the fundamental frequency can be measured.

Calculate the modulus of elasticity. The modulus of elasticity depends on the fundamental frequency of the bending vibration. The shear modulus depends on the torsional vibration frequency. The Poisson's ratio is determined by the elastic modulus and shear of the material.

The modulus of change determines that only two of the three are independent.

5 test equipment