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Test method of glass stress

  • Source: Unknown
  • Date: June 28, 2020
  • Number of views: three hundred and fifteen
 
Glass stress refers to the internal force that interacts between various parts of the glass when the glass is deformed due to external factors (stress, humidity, temperature field change, etc.) to resist the effect of such external factors and try to restore the glass from the deformed position to the position before deformation.
 
The glass stress test method is a nondestructive measurement method, which requires the glass specially provided by Shenzhen Dongyi Precision Equipment Co., Ltd Stress detector To complete the test. The glass stress detector is named after the application of polarized light interference principle to check the internal stress of glass. It is specialized in detecting the stress index of glass bottles, and can be used to detect the stress index of glass containers such as ampoules, vials, infusion bottles, wine bottles, jars, cosmetics bottles, and to control the quality of glass bottles.
 
Glass stress test method:
 
1. Remove the sensitive color plate, put a quarter wave plate into the field of view, and adjust the zero point of the polarization stress meter to make it appear dark field of view.
 
2. Put the sample in the field of view so that the axis of the sample is 45 ° from the polarization plane, and then there are different areas of light and dark on the side wall.
 
3. Rotate the polarizer until the dark area on the side wall meets and just completely replaces the bright area.
 
4. Rotate the test object around the axis to determine the maximum stress zone.
 
5. Record the placement angle of the polarizer in the maximum stress area measured, and use the CHY-B glass bottle wall thickness gauge to measure the original thickness of both sides of the wall (record the sum of the wall thickness of both sides).

 
The stress of glass directly affects the strength of glass. The thermal cracking of glass is caused by excessive thermal stress; The broken glass is caused by excessive mechanical stress caused by mechanical impact force or impact force; The self explosion of glass is caused by the excessive stress inside the glass. In addition, the increase in the strength of the glass due to thermal or chemical tempering is caused by the increase in the compressive stress on the surface of the glass. Therefore, the stress and strength of glass are closely related. Most of the stresses that can be detected by polarizing stress meter are thermal stresses. Thermal stress is caused by temperature gradient. This is because glass is a kind of amorphous product solidified by high temperature melting and rapid cooling. Therefore, during the production process, the temperature change of all parts on the glass plate surface cannot be uniform, so thermal stress will be generated. Because of this, the glass bottle needs to go through the annealing process, but there will still be residues. With the help of the glass stress detector of Shenzhen Dongyi Precision Equipment Co., Ltd., it is possible to determine whether the residual stress of glass bottles meets the requirements of relevant standards.
 
The above is the sharing of Shenzhen Dongyi Precision Equipment Co., Ltd. on "glass stress detection method". Glass stress detection is very important in glass quality detection. Shenzhen Dongyi Seiko Equipment Co., Ltd. specializes in the supply of stress testers, glass stress testers, Japanese original stress testers, fsm-6000le surface stress testers and other stress detection equipment, and provides professional laboratory solutions and equipment support services. Consulting hotline: 400-992-8117

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