1、Designation:C127913Standard Test Method forNon-Destructive Photoelastic Measurement of Edge andSurface Stresses in Annealed,Heat-Strengthened,and FullyTempered Flat Glass1This standard is issued under the fixed designation C1279;the number immediately following the designation indicates the year ofo
2、riginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of edgestresses and surfa
3、ce stresses in annealed,heat-strengthened,and fully tempered flat glass products.1.2 This test method is non-destructive.1.3 This test method uses transmitted light and is,therefore,applicable to light-transmitting glasses.1.4 The test method is not applicable to chemically-tempered glass.1.5 Using
4、the procedure described,surface stresses can bemeasured only on the“tin”side of float glass.1.6 Surface-stress measuring instruments are designed for aspecific range of surface index of refraction.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are inclu
5、ded in thisstandard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to us
6、e.2.Referenced Documents2.1 ASTM Standards:2C158 Test Methods for Strength of Glass by Flexure(De-termination of Modulus of Rupture)C162 Terminology of Glass and Glass ProductsC770 Test Method for Measurement of Glass StressOptical CoefficientC1048 Specification for Heat-Strengthened and Fully Tem-p
7、ered Flat GlassE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Documents:Engineering Standards Manual3“Surface and Edge Stress in Tempered Glass”43.Terminology3.1 Definitions:3.1.1 analyzera polarizing element,typically positionedbetween the
8、specimen being evaluated and the viewer.3.1.2 polarizeran optical assembly that transmits lightvibrating in a single planar direction,typically positionedbetween a light source and the specimen being evaluated.3.1.3 retardation compensatoran optical device,variantsof which are used to quantify the o
9、ptical retardation producedin transparent birefringent materials:typically positioned be-tween the specimen being evaluated and the analyzer.3.2 For definition of terms used in this test method,refer toTerminology C162.4.Summary of Test Methods4.1 Two test methods are described in this standard:4.1.
10、1 Procedure Adescribes a test method for measuringsurface stress using light propagating nearly parallel to thesurface.4.1.2 Procedure Bdescribes a test method for measuringedge-stress using light propagating in the direction perpendicu-lar to the surface.4.2 In both methods,the fundamental photoela
11、stic conceptis used.As a result of stresses,the material becomes opticallyanisotropic or birefringent.When polarized light propagatesthrough such anisotropic materials,the differences in the speedof light rays vibrating along the maximum and minimum1This test method is under the jurisdiction of ASTM
12、 Committee C14 on Glassand Glass Products and is the direct responsibility of Subcommittee C14.08 on FlatGlass.Current edition approved Oct.1,2013.Published October 2013 Originallyapproved in 1994.Last previous edition approved in 2009 as C1279-09.DOI:10.1520/C1279-13.2For referenced ASTM standards,
13、visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Glass Association of North America(GANA),800 SW JacksonStreet,Ste 1500,Topeka,Kan
14、sas 666121200.http:/4Redner,A.S.and Voloshin,A.S.,Proceedings of the Ninth InternationalConference on Experimental Mechanics,Denmark,1990.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 principal stress introduce a relative retardation be
15、tween theserays.This relative retardation is proportional to the measuredstresses,and can be accurately determined using compensators.For additional background see“Surface and Edge Stress inTempered Glass”4.5.Significance and Use5.1 The strength and performance of heat-strengthened andfully-tempered
16、 glass is greatly affected by the surface and edgestress induced during the heat-treating process.5.2 The edge and surface stress levels are specified inSpecification C1048,in the Engineering Standards Manual3ofGANA Tempering Division and in foreign specifications.5.3 This test method offers a direct and convenient way tonon-destructively determine the residual state of stress on thesurface and at the edge of annealed and heat-treated glass.6.Principles of Operation6.1 Procedure A:Measuring Surf
