Calculate the yield point of the reinforcement, with the formula, how to calculate the yield strengt

The yield point of the steel bar is obtained by tensile test of tensile machine, not by formula. The yield point of each steel bar in the tensile test of the same batch of steel bars is also slightly different. The diameter is 20mm; The yield force fs is 107kN, that is, when the tensile force of the tensile machine reaches 107kN, the steel bar begins to yield and is qualified.

Yield point = fs a = 107 * 1000 , the yield force fs in the problem should be 107kn.

107n？Or 107kn, please verify.

107000/（20²π/4）=340(mpa)

107 (20 4) = 0 (n) according to the rules of amendment.

The yield point refers to the stress when the steel specimen can continue to elongate (deform) without increasing (keeping it constant) during the test.

The so-called yield refers to the non-uniform transition from the elastic state to the elastic-plastic state after the metal reaches a certain deformation stress, which marks the beginning of macroscopic plastic deformation.

Its significance lies in the evaluation of the building safety stress coefficient, the traditional strength design method, for plastic materials, with yield strength as the standard, the allowable stress [ ] = ys n, the safety factor n is generally taken as 2 or greater, for brittle materials, the tensile strength is the standard, the allowable stress [ ] = b n, the safety factor n is generally taken 6.

It should be noted that according to the traditional strength design method, it will inevitably lead to the one-sided pursuit of high yield strength of the material, but with the increase of the yield strength of the material, the brittle breaking strength of the material is decreasing, and the brittleness risk of the material increases.

Yield strength not only has direct application significance, but is also a rough measure of certain mechanical behaviors and process properties of materials in engineering. For example, the yield strength of the material is increased, and it is sensitive to stress corrosion and hydrogen embrittlement; The yield strength of the material is low, the cold working formability and welding performance are good, and so on. Therefore, yield strength is an indispensable and important indicator in the properties of materials.

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Calculation method of yield strength of reinforcement:

The formula for calculating the yield strength: =f s, where is the yield strength, the unit is "mpa", for the reinforcement, f is the force experienced when the plastic deformation of the steel bar is the original length, the unit is "n", s is the cross-sectional area of the steel bar, the unit is "m 2".

Extended information: Yield strength is the yield limit of a metal material when the yield phenomenon occurs, that is, the stress that resists a small amount of plastic deformation. For metal materials without obvious yield, the stress value that produces the residual deformation is specified as its yield limit, which is called the conditional yield limit or yield strength.

External forces greater than this limit will cause the parts to fail permanently and cannot be recovered. For example, the yield limit of mild steel is 207MPa, when the external force greater than this limit acts, the parts will produce permanent deformation, less than this, the parts will return to their original appearance.

1) For materials with obvious yield phenomenon, the yield strength is the stress (yield value) at the yield point;

2) For materials where the yield phenomenon is not obvious, the stress at which the ultimate deviation of the linear relationship with stress-strain reaches a specified value (usually the original gauge distance). It is usually used as an evaluation index for the mechanical properties of solid materials, and is the practical use limit of materials. Because after the stress exceeds the yield limit of the material, the necking will occur, and the strain will increase, so that the material will be damaged and cannot be used normally.

How to calculate the yield strength of steel bar?

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We are glad to serve you the calculation method of yield strength of steel bar: the calculation formula of yield strength: =f s, where is the yield strength, the unit is "mpa", for steel bars, f is the force of plastic deformation of steel bars when the original length is exerted, the unit is "n", s is the cross-sectional area of steel bars, and the unit is "m 2".

Extended information: Yield strength is the yield limit of a metal material when the yield phenomenon occurs, that is, the stress that resists a small amount of plastic deformation. For metal materials without obvious yield, the stress value that produces the residual deformation is specified as its yield limit, which is called the conditional yield limit or yield strength.

External forces greater than this limit will cause the parts to fail permanently and cannot be recovered. For example, the yield limit of mild steel is 207MPa, when the external force greater than this limit acts, the parts will produce permanent deformation, less than this, the parts will return to their original appearance. 1) For materials with obvious yield phenomenon, the yield strength is the stress (yield value) at the yield point; 2) For materials where the yield phenomenon is not obvious, the stress at which the ultimate deviation of the linear relationship with stress-strain reaches a specified value (usually the original gauge distance).

It is usually used as an evaluation index for the mechanical properties of solid materials, and is the practical use limit of materials. Because after the stress exceeds the yield limit of the material, the necking will occur, and the strain will increase, so that the material will be damaged and cannot be used normally.

At the yield point of the rebar, the maximum load-bearing capacity of the rebar is fully utilized. The reinforcement is stressedThe states are divided into: straight line, elastic limit, yield limit, and fracture limit.

At the breaking limit, the rebar breaks. The yield limit is only about 1 5-1 10 of the fracture limit, so it is relatively safe and fully used for steel bar.

Yield strength. It is the yield limit of the metal material when the yield phenomenon occurs, that is, the stress that resists the trace plastic deformation. For metal materials without obvious yield phenomenon, the stress value that produces residual deformation is specified as its yield limit, which is called conditional yield limit or yield strength.

In addition to high strength and good plasticity, the usual structural seismic steel also needs to consider the strain aging sensitivity, brittle transition temperature, low-cycle fatigue resistance and welding properties of the steel. Low yield point steels are mainly used to make energy dissipation dampers.

Its seismic resistance determines the performance requirements of the steel.

In particular, the energy dissipation damper is required to bear the first load before other structural parts, and repeatedly deform and absorb the first energy in the plastic zone, so as to achieve the purpose of earthquake resistance. Therefore, the low yield point steel must have a very low yield point and the yield range is controlled in a very narrow range, and at the same time, it must also have good processing and welding performance, and have good plasticity, so as to have good deformation ability.

In addition, seismic steels are subjected to repeated alternating loads at **. The duration of a strong earthquake is generally less than 1 min, the amplitude frequency is usually 1 3 Hz, and the damage to the building is caused within 100 200 cycles, which belongs to high strain and low cycle fatigue. Therefore, it is required that the low yield point steel must have good resistance to low-cycle fatigue.

Because the steel with the yield point will produce a large plastic deformation after reaching the yield point, the structural components may be damaged before the steel enters the strengthening stage, or there is a large deformation and too wide cracks, so that it can not be used, so the yield strength of the steel bar with the yield point should be taken as the strength limit.

Because after the steel bar in the component reaches the yield point, it enters the strengthening stage, which will produce a large plastic deformation, and the test reinforced concrete component produces a large deformation and too wide cracks, so that it can not be used.

The formula for calculating the yield strength of rebar is =f s.

The formula for calculating the yield strength: =f s, where is the yield strength, the unit is "mpa", for the reinforcement, f is the force experienced when the plastic deformation of the steel bar is the original length, the unit is "n", s is the cross-sectional area of the reinforcement, the unit is "m 2".

Yield strength is the yield limit of a metal material when the yield phenomenon occurs, that is, the stress that resists a small amount of plastic deformation. For metallic materials that do not yield significantly, it is specified that residues can be generated.

How is the rebar done:

1. Rust removal of steel bars

Carry out the work of derusting the steel bar before the age finger. There are rust removal machine for steel bars, rust removal in steel bar straightening, manual rust removal and pickling rust removal, etc., which are selected by the construction unit according to the on-site equipment.

2. Straightening of steel bars:

Rebar straightening is the process of using a rebar straightening machine to straighten the bent rebar through tension to facilitate processing.

3. Cutting off steel bars:

Shearing work on rebar.

4. Steel bar forming:

Steel bar forming is generally divided into: shearing, bending, threading, etc. The steel bar blanking production line adopts computer control technology, which can realize the automatic sizing of steel bars, which is moved to the designated storage rack after cutting and stored according to specifications, so as to realize the optimal combination of steel bar cutting and reduce the waste to a minimum, or cooperate with the automatic bending machine to implement automatic production of formed steel bars.

The forming of stirrups is completed by the CNC steel bar bending machine, which can realize the continuous work of coil opening, straightening, bending stirrup, cutting, stirrup collection and other processes, and realize the automatic production of stirrup products. <>

Yield strength of rebar.

Calculation method: Brewing and training:

The formula for calculating the yield strength: =f s, where is the yield strength, the unit is "mpa", for the reinforcement, f is the force experienced when the plastic deformation of the steel bar is the original length, the unit is "n", s is the cross-sectional area of the steel bar, the unit is "m 2".

Yield strength of rebar.

Calculation method: Brewing and training:

The formula for calculating the yield strength: =f s, where is the yield strength, the unit is "mpa", for the reinforcement, f is the force experienced when the plastic deformation of the steel bar is the original length, the unit is "n", s is the cross-sectional area of the steel bar, the unit is "m 2".