ASTM C770 Measurement of Glass Stress—Optical Coefficient

ASTM C770 test method includes procedures for measuring the stress-optical coefficient of glass used in photoelastic analysis. The standard unit for the stress-optical coefficient is mm²/N.

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Scope:

ASTM C770 is useful in determining the magnitude of residual thermal stresses for pre-stressing (tempering) or annealing glass. This standard test method is also helpful for deciding optical retardation for a beam of glass of rectangular cross-section when subjected to uniaxial tension, four-point bending, and uniaxial compression. Stress-optical coefficients mainly determine stress in the glass.

Test Procedure:

Test Method	Section
Procedure A (Uniaxial tension)	4.1.1
Procedure B (Beam Bending)	4.1.2
Procedure C (uniaxial compression)	4.1.3

Specimen Size :

For ASTM C770, the stress optical coefficient K is calculated at a wavelength of λ = 0.5893 µm and temperature of 21°C. The measurement accuracy is ± 3% or ± 0.06·10^–6 mm²N^–1.

Data:

n = refractive index.

E = Young’s modulus.

µ = Poisson number.

Conclusion:

ASTM C770 is useful in determining the magnitude of residual thermal stresses for pre-stressing (tempering) or annealing glass.

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