How to calculate shear force in acceleration test

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. 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

3.

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

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

5.

Shear force is the force that can make the material proce shear deformation

the key to judge whether "shear" or not is whether the cross section of the 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 (because there is 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

The source of "shear force" is of course caused by pressure. It can also be said that shear force is a special form of pressure

extended data

shear wall structure is a structure that uses the internal or external walls of a building to make shear walls to bear vertical and horizontal loads. Shear walls are generally reinforced concrete walls with the same height and width as the whole building. Because its main load is horizontal load, it is shear and bending, so it is called shear wall. Shear wall structure has large lateral stiffness and small deformation, which is not only load-bearing but also enclosure. It is suitable for residential and tourism buildings

seismic characteristics of shear wall: in earthquake, ground motion is generated e to the action of seismic wave, and the superstructure is affected by the foundation of the building, which makes the structure vibrate. The inertial force generated by the vibration of the building is the seismic load. Seismic wave may cause vertical vibration and horizontal vibration of buildings, but generally the damage to buildings is mainly caused by horizontal vibration. Therefore, horizontal seismic force is mainly considered in design

seismic load is inertial force, so its magnitude is not only related to the mass of the structure, but also related to the motion state of the structure. Generally, the motion state of the structure (displacement, velocity and acceleration of each particle) is called seismic response

The ground motion can be described by the ground acceleration waveform. Different earthquakes, different sites and different epicentral distances will proce different ground motions. It is observed that the predominant period of seismic wave is about 0.1 ∽ 0.3 seconds in hard foundation such as rock, and 1.5 ∽ 2 seconds in deep soft foundation

The period of

is quite close to the period of general buildings (0.3-3 seconds), so the seismic response of general buildings is relatively obvious, and it is easy to cause earthquake damage when reaching a certain vibration intensity

high rise buildings have a long natural period, which is easy to resonate with the long period component of seismic wave. A large number of earthquake damages show that compared with low rise buildings, high-rise buildings are more affected by the earthquake, and the consequences of earthquake damage are more serious, especially on the soft soil foundation

6. Calculation of stress ring tension: the ratio of the applied force to the original cross-sectional area of the specimen
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 The shear stress is called shear stress when it is tangent to the shear plane
the difference between them lies in the inconsistency of direction. In addition, the shear stress is assumed to be uniform

7. 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.

8. Let me answer: the frikian mode is 3456 7123, which is a scale composed of two "semi complete" four tone series.

9.

Shear force of bolt = shear strength of bolt * effective cross-sectional area of bolt (shear on one side, shear on both sides * 2); Stress section area of M12 bolt: 84.3 basic formula of bolt shear strength calculation: hope to help you, thank you