Test for Edge and Surface Stresses in Tempered Flat Glass

Edge and surface stresses are residual stresses that occur in tempered flat glass as a result of the thermal tempering p rocess. During the tempering process, the glass is heated to a high temperature and then rapidly cooled, which creates compressive stresses on the surface of the glass. These stresses increase the strength of the glass and make it more resistant to breakage. However, they can also create edge stresses, which can cause the glass to break if it is subjected to sudden impacts or other external stresses.... Read More

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Test for Edge and Surface Stresses in Tempered Flat Glass

ASTM C1279 is a standard test method for non-destructive photoelastic measurement of edge and surface stresses in annealed, heat-strengthened, and fully tempered flat glass. This test method provides a procedure for measuring the level of residual stresses in flat glass using a polariscope and a digital camera.

The test involves applying a load to the glass and then using the polariscope to observe the pattern of stress distribution in the glass. The digital camera captures images of the polariscope patterns, which are then analyzed to determine the level of residual stress in the glass.

This test method is important for evaluating the quality and safety of glass used in various applications, such as building facades, windows, and automotive windshields. Excessive residual stresses in glass can lead to spontaneous breakage, which can pose a safety hazard. Measuring these stresses non-destructively using photoelasticity can help to identify any potential weaknesses in the glass and ensure its suitability for its intended use.

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