The middle force of a steel plate is the ultimate force

1.

σ= Fb/So

in the tensile process, the material enters the strengthening stage after the yield stage, and then the maximum force FB is obtained by dividing the original cross-sectional area so of the sample with the decrease of the transverse section size σ， It is called tensile strength or strength limit σ b. The unit is MPa. It represents the maximum ability of a metal material to resist failure under tension. The calculation formula is as follows: σ= Fb/So

when the steel yield to a certain extent, e to the rearrangement of internal grains, its resistance to deformation increases again. At this time, although the deformation develops rapidly, it can only increase with the increase of stress until the stress reaches the maximum. After that, the ability of steel to resist deformation is obviously reced, and a large plastic deformation occurs at the weakest point, where the cross section of the specimen shrinks rapidly, necking phenomenon occurs, and finally fracture occurs

(kilogram force per unit area)

in China, the universal material testing machine is widely used to measure the tensile / compressive strength of materials

for brittle materials and plastic materials without necking, the highest tensile load is the fracture load, so the tensile strength also represents the fracture resistance. For necking plastic materials, the tensile strength represents the resistance to the maximum uniform deformation and the ultimate bearing capacity of the material under static tension. For parts such as wire rope, tensile strength is a significant performance index. Tensile strength is easy to measure and has good reprocibility. It has a certain relationship with other mechanical properties such as fatigue limit and hardness. Therefore, it is also used as one of the conventional mechanical properties to evaluate proct quality and process specification

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5. It's more than two kilometers. If you go there, it's very convenient for you to take a bus

6.

bus route: K900 → fok349, the whole journey is about 21.1km

1. Walk about 20m from Yongwang Shunde shopping center to Ximen station of Yongwang shopping center

2. Take K900, pass 3 stops, and reach Shunde station of Guangzhou Zhuhai urban rail transit

3. Walk about 410m, and reach Shunde station intersection of Guangzhou Zhuhai urban rail transit

4. Take fok349, pass 5 stops, Arrive at Qi Village (Liyuan Xintiandi) station

5, walk about 160 meters, arrive at Lai yuan new world

7.

bus line: no.906, the whole journey is about 10.2km

1. Walk about 410 meters from Yongwang Shunde shopping center to Shunfengshan Park Station

2. Take no.906, pass 20 stops, and reach Jinhu substation (or take No.380)

3. Walk about 290 meters to Fengxiang instrial zone

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