The permanent stress in glass bottles

Permanent stress

when the temperature of the glass bottle glass inside and outside is equal to the residual thermal stress called permanent stress.

will be a piece of glass heated to a temperature higher than glass strain point above a certain temperature, wait for after soaking plate on both sides evenly with natural cooling, after a certain period of time the eco-friendly tube temperature field in a parabolic distribution. outer lining for the tensile stress to compressive stress, due to the glass with viscoelastic strain point above, namely glass for plastic state at this time, can produce displacement and deformation after stress, to eliminate internal stress produced by temperature gradient. This process is called the stress relaxation process, at this moment eco-friendly tube inside and outside layer is there is a temperature gradient but there is no stress. When cooled to below the strain point, eco-friendly tube has become an elastomer, after the change of temperature and stress is the case with the temporary stress, stay while cooling to room temperature to eliminate the stress produced by the strain points, but does not eliminate stress produced by strain point above, at this point, the stress direction just on the contrary, the surface is compressive stress, the internal tensile stress, the stress for permanent stress.

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