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ASTM C770-16(2020)

Historical Reaffirmation

Standard Test Method for Measurement of Glass Stress—Optical Coefficient

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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.


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.

SDO ASTM: ASTM International
Document Number C770
Publication Date Aug. 1, 2020
Language en - English
Page Count 9
Revision Level 16(2020)
Supercedes
Committee C14.04
Publish Date Document Id Type View
May 1, 2016 C0770-16 Revision
Oct. 10, 1998 C0770-98 Revision
Aug. 1, 2020 C0770-16R20 Reaffirmation
Oct. 1, 2013 C0770-98R13 Reaffirmation
April 1, 2008 C0770-98R08 Reaffirmation
Oct. 10, 1998 C0770-98R03 Reaffirmation