The temporary stress in glass bottles

Temporary stress

when the temperature below the strain point, in the elastic deformation temperature range ( The brittle state) being uneven thermal stress produced by temperature changes, with the presence of temperature gradient, temperature gradient disappear disappear, this stress is called stress for the time being.

the temperature and stress free glass plate below the strain point of double even natural cooling, the surface layer of glass temperature fell sharply, due to the low thermal conductivity of glass, so the inner cooling slowly, and had a temperature gradient inside the eco-friendly tube, along the thickness direction of the distribution of temperature field is parabolic.

glass bottles in the cooling process of the outer part of the low temperature shrinkage should be greater than the inner layer, but due to the inner layer and not hinder the normal contraction amount, so the outer produced tensile stress, the inner layer, a compressive stress is created in a compressed state. The glass thickness direction stress distribution is outer for the tensile stress, the inner of compressive stress, the stress distribution in parabolic. One layer in the middle of the glass, the compressive and tensile stress are equal in size, the stress in the opposite direction, cancel each other out, the stress is zero, the layer said neutral layer.

glass bottle keep cool when surface layer after cooling to room temperature, surface temperature no longer, its volume is no longer contract, but the inner temperature higher than the outer layer, it will continue to cooling contraction, it began to pull by the inner and outer pressure stress, this section will be partly offset by the stress at the beginning of cooling by tensile stress, while the inner shrinkage by outer tensile is tensile stress, will be partly offset by compressive stress at the beginning of the cooling. On the other hand, if the glass from room temperature heating until the strain under a certain temperature heat preservation, the temperature change curve and stress change curve in the opposite.

although temporary stress with the disappearance of the temperature gradient and disappear, but the stress value should be kept under strict control, if exceed the limit of tensile strength of glass, glass crack will happen. This phenomenon is usually applied to quench method to cut the glass and glass tube, glass rod, etc.

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