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Significance and Use
3.1 Stress-optical coefficients are used in the determination of stress in glass. They are particularly useful in determining the magnitude of thermal residual stresses for annealing or pre-stressing (tempering) glass. As such, they can be important in specification acceptance.
1.1 This test method covers procedures for determining the stress-optical coefficient of glass, which is used in photoelastic analyses. In Procedure A the optical retardation is determined for a glass fiber subjected to uniaxial tension. In Procedure B the optical retardation is determined for a beam of glass of rectangular cross section when subjected to four-point bending. In Procedure C, the optical retardation is measured for a beam of glass of rectangular cross-section when subjected to uniaxial compression.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C336 Test Method for Annealing Point and Strain Point of Glass by Fiber Elongation
C598 Test Method for Annealing Point and Strain Point of Glass by Beam Bending
C1426 Practices for Verification and Calibration of Polarimeters
F218 Test Method for Measuring Optical Retardation and Analyzing Stress in Glass
NIST StandardNIST Recommended Practice Guide Fractography of Ceramics and Glasses (Subsection 4.6.2Flexural Strength)
ICS Number Code 81.040.10 (Raw materials and raw glass)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM C770-16(2020), Standard Test Method for Measurement of Glass Stress—Optical Coefficient, ASTM International, West Conshohocken, PA, 2020, www.astm.orgBack to Top