The unsafe hidden dangers of ordinary glass mainly come from the cracking and falling off of glass. Glass is fragile. The sharp edge or sharp corners on the broken side are very easy to cause puncturing damage to the person. When the debris falls from the sky, it will fall like a knife; when the body hits the glass. The sharp corner of the fracture scratches the skin. On the building. Glass, especially glass curtain walls, are generally installed in violent areas and may be broken.
When the tensile stress acting on the surface layer of the glass exceeds the allowable range of the glass strength, the glass building is broken. The main situation is: the glass is broken when it is impacted} the thermal cracking of the glass, especially the heat absorbing glass and the heat reflecting glass when exposed to sunlight. Forming a non-uniform temperature field on the surface of the glass. Thereby forming thermal stress in the glass. When this thermal stress exceeds the allowable range of the strength of the glass, the explosion occurs. After the glass is subjected to the wind load, that is, the wind pressure. The force of the wind pressure exceeds the allowable range of the strength of the glass. The glass is installed with a large stress. When the glass is pressed, the glass also bursts. The glass is damaged or cracked before or during the installation. Rupture occurs when subjected to other external forces; cracking or bursting occurs under the influence of other factors such as earthquakes, ice and snow. The broken or cracked glass may fall off and become an unsafe factor.
Therefore, the safety of the glass is first considered to prevent the impact of the human body, and secondly, the glass is dropped. When the human body hits the glass, the force of the glass can be simplified to a concentrated force, but this concentration is compared with the concentrated force generated by a hard object such as a bullet or a stone hitting the glass. There are certain differences in the way they work.

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