The principle that a tempered glass cannot be broken
What is a tempered glass? It can be understood literally that it is made of a tempered glass.
Why can't this glass break? Actually, this kind of toughened glass is also called reinforced glass, it is a kind of prestressed glass actually. In order to improve the strength of the glass, use the method of chemistry or physics normally, form in vitreous surface press stress, glass bears offset above all when outside force surface layer stress, so as to improve the bearing capacity, enhance the wind resistance glass itself, through sex, impact, etc.
Layer when the glass by external force, the pressure will be offset part of the tensile stress, avoid the glass broken, although toughened glass internal in large tensile stress state, but the interior of the glass without defects exist, will not cause damage, so as to achieve the goal of increased the strength of the glass.
As is known to all, microcracks on the surface of materials are the main cause of material fracture. Because the microcrack will gradually expand under the action of tension, and finally crack along the crack. After toughening the glass, due to the large pressure stress on the surface, the micro-cracks on the glass surface can become more subtle and even "healed" under extrusion.
Features of toughened glass that cannot be broken:
The first is that the strength is several times higher than that of ordinary glass.
Secondly, it is safe to use. Its bearing capacity increases and the fragile quality is improved. Compared with ordinary glass, toughened glass has 3~5 times of rapid cooling and heat resistance, and can withstand temperature difference of more than 250 degrees, which has obvious effect on preventing thermal cracking. It's one of the safety glass.
The impact strength of tempered glass of the same thickness is 3 ~ 5 times that of ordinary glass, and the bending strength is 3 ~ 5 times that of ordinary glass.
Toughened glass has good thermal stability, able to withstand the temperature difference is common glass of 3 times, can withstand 200 ℃ temperature changing.
Although the strength of toughened glass is stronger than that of ordinary glass, tempered glass has the possibility of self-explosion when the temperature difference changes greatly, and ordinary glass does not have the possibility of self-explosion.