Guangdong Tengfei Mining Machinery Co, Ltd
Publish: 2021-05-08 17:16:34
1. A cubic meter of glass is 2.5 tons (approximate value, glass instry is so calculated), a ton of glass is 1000mm * 1000mm glass, 400mm thick, so a ton of 4mm glass has 100 square meters (400 / 4 = 100), a ton of 5mm glass has 80 square meters (400 / 8 = 80), and so on, we can calculate how many square meters each thickness of a ton of glass has
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The common calculation formula of glass load is wk = 0.2 α， There are also a few wks= α( 0.2t1.6+0.8)/Amax
area * thickness (converted to meter) * 2. 5 = ton
example: 12mm thick glass, 500m2, weight calculation formula: 500 times 0. 012 meters by two. 5 is equal to 15 tons
1. The weight of glass is equal to the density of glass multiplied by the volume of glass
The volume of glass is equal to the area of glass multiplied by the thickness of glass The area of glass is equal to the length of glass multiplied by the width of glass; The general formula: the weight of glass = glass density * glass length * glass width * glass thickness{rrrrrrr}
extended data:
weight calculation formula of flat pressure glass:
weight of pressure glass (unit: kg) = length (unit: m) * width (unit: m) * density * thickness (unit: mm)
weight calculation formula of round pressure glass:
weight of pressure glass (unit: kg) = 3.14 * r (unit: m) * density * thickness (unit: mm) < br/ >
in the absence of vernier caliper to accurately measure the thickness of glass, the weight of pressure resistant glass can be calculated by the above two formulas. If the calculated data is not consistent with the actual weight of the glass (the general error value should not exceed ± 50g), we can directly judge the glass quality is not qualified< br />
4. Generally, only the strength of glass fiber in FRP is calculated, and only the strength in the direction of force is calculated. The laying direction of glass fiber should be considered
the resin is only regarded as the space position fixator of glass fiber, and its contribution to the strength is not considered
this kind of calculation tends to be safe< In general, the smaller the diameter of glass fiber is, the higher the tensile strength is. However, the tensile strength of the same diameter drawn at different drawing temperatures may be different. The tensile strength of glass fiber is related to its length. With the increase of fiber length, the tensile strength decreases significantly. The effect of diameter and length on the tensile strength of glass fiber can be explained by the microcrack hypothesis. Because with the decrease of fiber diameter and length, the microcracks in the fiber will decrease correspondingly, which improves the fiber strength
2. The effect of chemical composition on strength
generally, the higher the alkali content is, the lower the strength is. The tensile strength of alkali free fiber is 20% higher than that of alkali free fiber. It is proved that high strength and alkali free fiber have high tensile strength e to high molding temperature, fast hardening speed and large structural chain energy. The strength of glass fiber containing more K2O and PbO is lower
3. The influence of liquid glass quality on the strength of glass fiber
A) the influence of crystal impurities: when the glass composition fluctuates or the temperature of the leaky plate fluctuates or decreases, the crystal may appear in the fiber. It has been proved that the strength of crystallized fiber is lower than that of non crystallized fiber
b) small bubbles in the liquid glass will also rece the strength of the fiber. The glass fiber with diameter of 5.7um drawn by liquid glass containing small bubbles has been tested. Its strength is 20% lower than that drawn by pure liquid glass
4. The influence of molding conditions on glass fiber
practice has proved that the strength of glass fiber drawn by the leaky plate is higher than that drawn by the glass rod method. In the glass rod process, the strength of the fiber heated by gas is higher than that heated by electric heating wire. For example, the strength of the glass fiber is 1700 MPa when the leakage plate is used to draw 10um, while the strength of the glass fiber with the same diameter drawn by the rod method is only 1100 MPa. This is because the glass rod is only heated to soften, and the viscosity is still very high, so the fiber is subject to great stress ring drawing; In addition, the cooling rate of the glass rod method is lower than that of the leaky plate method. The strength of glass fiber proced by different molding methods is different. The strength of the fiber made of fluted plate farad is the highest, followed by air blown long cotton and glass rod method. Then the steam vertical blowing short cotton, the lowest strength is steam injection mineral wool. The fiber strength can be improved by using higher forming temperature and smaller hole diameter
5. Effect of surface treatment on strength
in continuous drawing, wetting agent must be applied on single fiber or fiber bundle, which forms a protective film on the fiber surface to prevent mutual friction between fibers in the process of textile processing, thus damaging the fiber and recing the strength. After heat treatment, the strength of glass cloth decreases a lot, but after treatment with intermediate binder, the strength generally rises. This is because the intermediate binder coating can protect the fiber on the one hand, and make up for the surface defects of the fiber on the other
6. Effect of storage time on strength
the strength of glass fiber will decrease after storage for a period of time, which is called fiber aging. The main reason is that the moisture in the air erodes the fiber. As a result, the strength of the fibers with high chemical stability decreased by 33% after 233 years storage, while the strength of the fibers without alkali decreased little
7. The effect of loading time on the strength
the strength of glass fiber decreases with the increase of loading time. Especially when the ambient temperature is high. The reason may be that the moisture absorbed in the microcrack accelerates the propagation speed of microcrack under the action of external force< Test method for tensile properties of glass fiber reinforced plastics (GB / T 1447-2005)
the resin is only regarded as the space position fixator of glass fiber, and its contribution to the strength is not considered
this kind of calculation tends to be safe< In general, the smaller the diameter of glass fiber is, the higher the tensile strength is. However, the tensile strength of the same diameter drawn at different drawing temperatures may be different. The tensile strength of glass fiber is related to its length. With the increase of fiber length, the tensile strength decreases significantly. The effect of diameter and length on the tensile strength of glass fiber can be explained by the microcrack hypothesis. Because with the decrease of fiber diameter and length, the microcracks in the fiber will decrease correspondingly, which improves the fiber strength
2. The effect of chemical composition on strength
generally, the higher the alkali content is, the lower the strength is. The tensile strength of alkali free fiber is 20% higher than that of alkali free fiber. It is proved that high strength and alkali free fiber have high tensile strength e to high molding temperature, fast hardening speed and large structural chain energy. The strength of glass fiber containing more K2O and PbO is lower
3. The influence of liquid glass quality on the strength of glass fiber
A) the influence of crystal impurities: when the glass composition fluctuates or the temperature of the leaky plate fluctuates or decreases, the crystal may appear in the fiber. It has been proved that the strength of crystallized fiber is lower than that of non crystallized fiber
b) small bubbles in the liquid glass will also rece the strength of the fiber. The glass fiber with diameter of 5.7um drawn by liquid glass containing small bubbles has been tested. Its strength is 20% lower than that drawn by pure liquid glass
4. The influence of molding conditions on glass fiber
practice has proved that the strength of glass fiber drawn by the leaky plate is higher than that drawn by the glass rod method. In the glass rod process, the strength of the fiber heated by gas is higher than that heated by electric heating wire. For example, the strength of the glass fiber is 1700 MPa when the leakage plate is used to draw 10um, while the strength of the glass fiber with the same diameter drawn by the rod method is only 1100 MPa. This is because the glass rod is only heated to soften, and the viscosity is still very high, so the fiber is subject to great stress ring drawing; In addition, the cooling rate of the glass rod method is lower than that of the leaky plate method. The strength of glass fiber proced by different molding methods is different. The strength of the fiber made of fluted plate farad is the highest, followed by air blown long cotton and glass rod method. Then the steam vertical blowing short cotton, the lowest strength is steam injection mineral wool. The fiber strength can be improved by using higher forming temperature and smaller hole diameter
5. Effect of surface treatment on strength
in continuous drawing, wetting agent must be applied on single fiber or fiber bundle, which forms a protective film on the fiber surface to prevent mutual friction between fibers in the process of textile processing, thus damaging the fiber and recing the strength. After heat treatment, the strength of glass cloth decreases a lot, but after treatment with intermediate binder, the strength generally rises. This is because the intermediate binder coating can protect the fiber on the one hand, and make up for the surface defects of the fiber on the other
6. Effect of storage time on strength
the strength of glass fiber will decrease after storage for a period of time, which is called fiber aging. The main reason is that the moisture in the air erodes the fiber. As a result, the strength of the fibers with high chemical stability decreased by 33% after 233 years storage, while the strength of the fibers without alkali decreased little
7. The effect of loading time on the strength
the strength of glass fiber decreases with the increase of loading time. Especially when the ambient temperature is high. The reason may be that the moisture absorbed in the microcrack accelerates the propagation speed of microcrack under the action of external force< Test method for tensile properties of glass fiber reinforced plastics (GB / T 1447-2005)
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