How to calculate the shearing force of dispersion plate

1.

Shear force F (n) = sectional area s (mm 2) x yield strength σ "Shear" is a relative dislocation deformation phenomenon of the cross section of the material under the action of a pair of lateral external forces (that is, the force perpendicular to the action surface) which are very close, the same size and opposite to each other. The force that can make the material proce shear deformation is called shear force or shear force

extended data:

the key to judge whether "shear" or not is whether the cross section of material has relative dislocation. Therefore, cutting vegetables with a kitchen knife is not a shearing phenomenon (because there is no relative dislocation in the cross section of vegetables), while cutting nails with scissors is a shearing phenomenon (relative dislocation in the cross section of nails). Note: using nail clippers to cut nails is not a cutting phenomenon, although it can also cut nails off. It belongs to extrusion deformation

As for the source of "shear force", it is of course caused by pressure. It can also be said that shear force is a special form of pressure

2.

Calculation of shear stress: in practical calculation, it is assumed that the shear stress is uniformly distributed on the shear plane. If a is used to represent the shear plane area, the stress is

V -- the shear force acting along the web plane in the calculation plane

s -- calculate the area moment (static moment) of the section above or below the shear stress to the neutral axis

I -- Section moment of inertia

T -- web thickness

reference source: Network shear stress

reference source: Network shear stress

3.

Shear stress formula σ= WS / a (kg / mm2)

shear stress refers to the internal force generated by the interaction between various parts of the object when the object is deformed e to external factors (stress, humidity change, etc.), so as to resist the effect of this external factor, and try to make the object recover from the position after deformation to the position before deformation

< H2 > extended data

when an object is deformed e to external factors (stress, humidity change, etc.), the internal force of interaction between various parts of the object is generated to resist the effect of this external factor, and the object is tried to recover from the position after deformation to the position before deformation. The internal force per unit area at a point of the section under investigation is called stress. What is tangent to the same section is called shear stress or shear stress

the so-called shear force is: two parallel forces acting on the same object are very close (but not zero), equal in size and opposite in direction. For example, when scissors cut an object, the force on the object is shear force. Or the internal force of an object e to its physical properties in order to recover the deformation caused by torque

4. The shear force divided by the cross-sectional area is the stress. There is a difference between stress and stress. The former is the set degree, the latter is the size. The shear force is generally known. The shear force is generally caused by tension or pressure. For example, it is common in bolts or steel plates

5.

Formula: shear force F (n) = sectional area s (mm 2) x yield strength σ (PA); It has nothing to do with material

take round steel with diameter of 160 as an example:

shear strength = 0.6-0.8 tensile strength (51.6kg/mm for high quality steel); The calculated s = 200.96mm

maximum shear force = 0.8x51.6x200.96 = 8295.3kgf; Minimum shear force = 0.6x51.6x200.96 = 6221.7kgf

The round steel can be divided into hot rolling, forging and cold drawing. The specification of hot rolled round steel is 5.5-250mm. Among them: 5.5-25 mm small round steel is mostly supplied in bundles of straight bars, which are commonly used as reinforcement, bolts and various mechanical parts; Round steel larger than 25 mm is mainly used for manufacturing mechanical parts, seamless steel tube billets, etc

extended data:

the resultant force of the external forces acting on the two sides of the member is a pair of transverse concentrated forces with the same size, opposite direction and very close action lines

under the action of such external force, the deformation characteristics of the component are: Taking the cross section between the two forces as the dividing line, the two parts of the component move relatively along the plane. This form of deformation is called shear, and its section is shear plane. The shear force per unit area of a section is called shear stress

calculation of shear stress: in practical calculation, it is assumed that the shear stress is uniformly distributed on the shear plane. If a is the shear plane area, the stress is τ= F/A; τ It is tangent to the shear plane, so it is called shear stress

τ- Shear stress MPa; F - shear force N; A-shear area is not related to material, but shear resistance is related to material

6. F = kltj
k: safety factor, l: shear length, t: material thickness, j: material shear strength. K is generally taken as 1.3

7. Shear stress formula σ= WS / a (kg / mm2)
calculation formula
1. Average shear stress
V -- shear force on calculation section
A -- calculated cross-sectional area
B -- section width; H-section height
peak stress
2. Shear force calculation formula based on shear flow
v-shear force acting along the web plane
s -- calculate the area moment (static moment) of the section above or below the shear stress to the neutral axis
I -- Section moment of inertia
T -- web thickness
extended data:
shear stress refers to the internal force generated by the interaction between various parts of an object when the object is deformed e to external factors (stress, humidity change, etc.), so as to resist the effect of this external factor, and try to make the object return to the position before deformation from the position after deformation< 1. Natural aging is a method to stabilize the dimensional accuracy of parts by exposing them to the outside for several months to several years. A large number of experiments and proction practice have proved that natural aging has a good effect of stabilizing the dimensional accuracy of castings< However, the change of resial stress is not obvious after natural aging. It can be seen from Figure 3-1 that the resial stress of the casting sample only decreases by 2-10% after one year; The results show that the maximum resial stress is reced from 80N / mm to 70N / mm, and the average resial stress is reced from 38n / mm to 30n / mm,
that is, it is only reced by about 10-20%. It can be seen that considerable resial stress still exists in the castings which have stopped deformation after natural aging. For those castings which need to bear a large load in service, the service performance of castings may be affected when the service stress is superimposed on the higher resial stress. Therefore, it must be carefully considered whether this aging method should be adopted
2. According to the hot time method, put the workpiece into the heat aging furnace for heat treatment, and slowly relieve the stress. The disadvantages of this method are also very obvious. For example, aluminum alloy workpieces with very strict temperature control requirements in satellite manufacturers and giant workpieces as long as 10 meters or more cannot be processed by this method
and this method also brings a lot of pollution and energy consumption. With the further requirements of environmental protection in China and the world, the treatment method of thermal aging furnace is facing the situation of full withdrawal
source of reference: network stress
source of reference: network shear stress

8. At first, microbial reactors were mostly used in plant cell culture reactors. Due to the different morphological structure of plant cells and microbial cells, plant cells are larger than microbial cells, and have poor tolerance to shear force. Moreover, the requirement of oxygen is much lower than that of microorganisms. Therefore, microbial reactor is not completely suitable for the growth and proction of plant cells. There are many plant cell culture reactors which are different from traditional microbial reactors and are improving. The main reactors used for plant cell culture are agitated, non agitated and improved reactors, as well as plant cell immobilization reactor and membrane reactor.

9.

Kobe Bean Bryant, born in Philadelphia, Pennsylvania on August 23, 1978, is a famous professional basketball player in the United States, nicknamed "black mamba". It is no exaggeration to say that he led a basketball era, and countless teenagers regarded him as an idol

When he was a teenager, Kobe entered the NBA with his excellent basketball talent and hard training, and won the all star NBA slam nk contest in 1997. At that time, he was not only the youngest player in NBA history, but also the youngest champion of nk contest in NBA history. This young man, who has been amazing for four years, is destined to become the God of basketball

the whole basketball instry was shocked by the news. Everyone is thinking of Kobe, and everyone is lamenting that "an era has come to an end." Although the death of Kobe makes us sad, the basketball myth and basketball spirit he left behind inspire generations of teenagers. Kobe will live in our hearts forever

10.

Kobe Bryant died on January 26, 2020. Former NBA basketball star Kobe bly was killed in a helicopter accident in calabatis, California on January 26, 2020. He was only 41 years old

On April 5, Kobe was officially elected to the Nai Smith Basketball Hall of fame; On August 13, Orange County, California, announced August 24 as "Kobe day."

extended materials

after Kobe's death, people gathered at the Staples Center to express their grief, and fans from all over the world also traveled a long way to the site of Kobe's crash to express their respect. Before the game between the Lakers and the Blazers last week, LeBron James and other Laker players also paid a deep tribute to Kobe at the Staples Center

in addition, Los Angeles Mayor Eric gasetti has previously said that they have been planning a memorial service, "we want to hold a memorial service to remember Kobe's great contribution, and to mourn the departure of his daughter and other victims." He said he had been in touch with Kobe's widow Vanessa to discuss how to hold a memorial meeting

reference source: Internet - Kobe Bryant

reference source: People's Daily - Kobe's memorial service will be held at Staples Center on the 24th local time