MaTestLab > Test Standards > ASTM C1279 Non-Destructive Photoelastic Measurement of Edge and Surface Stresses
ASTM C1279 Non-Destructive Photoelastic Measurement of Edge and Surface Stresses
ASTM C1279 is a widely recognized test method used to measure edge and surface stresses in flat glass. This non-destructive method is commonly used in the glass industry to assess the stress levels present in annealed, heat-strengthened, and fully tempered glass.
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Introduction to ASTM C1279
ASTM C1279 provides a standardized procedure for non-destructive photoelastic measurement of edge and surface stresses in flat glass. This test method utilizes photoelasticity, a technique that allows for the visualization and measurement of stress patterns in transparent materials such as glass. By evaluating the stress levels, manufacturers can assess the potential for glass breakage and deformation under various loading conditions.
ASTM C1279 test method is useful for qualitative characterization, research, development, and specification purposes.
ASTM C1279 Test Method
The ASTM C1279 test method involves the following steps:
Specimen Preparation
Representative specimens of the flat glass are obtained ensuring they meet the required dimensions. The edges of the specimens are prepared by smoothing and polishing them to minimize any surface irregularities.
Photoelastic Measurement
In ASTM C1279, a photoelastic material like a plastic sheet or liquid coating is applied to the glass specimen’s surface. When the specimen is illuminated with polarized light, the photoelastic material exhibits stress-induced birefringence. The resulting interference patterns are captured using an optical instrument and analyzed to determine the magnitude and distribution of edge and surface stresses in the glass specimen.
ASTM C1279 Specimens
Specimen details
The specimens used in ASTM C1279 are flat glass samples, including annealed, heat-strengthened, and fully tempered glass.
Specimen dimensions
The dimensions of the specimens are determined based on the specific requirements of the test and the type of glass being evaluated.
Specimen preparation
The specimens are prepared by cutting them to the appropriate size and ensuring the edges are smoothed and polished to minimize any potential stress concentrations.
ASTM C1279 Results
The test method ASTM C1279 provides valuable information about the edge and surface stresses in flat glass. By analyzing the interference patterns, manufacturers assess the stress distribution and identify areas of high stress concentration. This information is crucial for ensuring the structural integrity and performance of glass products, as it helps prevent glass breakage and failure under different loading conditions.
Tests Related to ASTM C1279
ASTM C1422 is a related test method that provides guidelines for conducting a biaxial flexure test on glass.
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