what is the difference between tensile & yield strength?

Answer 1

Tensile strength measures the force required to pull something such as rope, wire, or a structural beam to the point where it breaks.

Specifically, the tensile strength of a material is the maximum amount of tensile stress that it can be subjected to before failure.

There are three typical definitions of tensile strength:

Yield strength - The stress a material can withstand without permanent deformation. For materials without a clear distinct yield point, yield strength is usually stated as the stress at which a permanent deformation of 0.2% of the original dimension will result, known as the 0.2% yield stress".
Ultimate strength - The maximum stress a material can withstand.
Breaking strength - The stress coordinate on the stress-strain curve at the point of rupture



Yield strength, or the yield point, is defined in engineering and materials science as the stress at which a material begins to plastically deform. Prior to the yield point the material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed some fraction of the deformation will be permanent and non-reversible.
In structural engineering, yield is the permanent plastic deformation of a structural member under stress. This is a soft failure mode which does not normally cause catastrophic failure unless it accelerates buckling.

The point at which dislocations first begin to move. Given that dislocations begin to move at very low stresses, and the difficulty in detecting such movement,this definition is rarely used.
Elastic Limit - The lowest stress at which permenent deformation can be measured. This requires a complex iterative load-unload procedure and is critically dependent on the accuracy of the equipment and the skill of the operator.
Proportional Limit - The point at which the stress-strain curve becomes non-linear. In most metallic materials the elastic limit and proportional limit are essentially the same.
Offset Yield Point (proof stress) - Due to the lack of a clear border between the elastic and plastic regions in many materials, the yield point is often defined as the stress at some arbitrary plastic strain (typically 0.2%). This is determined by the intersection of a line offset from the linear region by the required strain. In some materials there is essentially no linear region and so a certain value of plastic strain is defined instead. Although somewhat arbitrary this method does allow for a consistent comparison of materials and is the most common.

Answer 2

In materials engineering, yield strength and tensile strength are two properties that can be used to characterize a material. The main difference between yield strength and tensile strength is that yield strength is the minimum stress under which a material deforms permanently, whereas tensile strength describes the maximum stress that a material can handle before breaking.

Answer 3

Yield Strength

Answer 4

Tensile strength measures the force required to pull something such as rope, wire, or a structural beam to the point where it breaks.

Specifically, the tensile strength of a material is the maximum amount of tensile stress that it can be subjected to before failure. The definition of failure can vary according to material type and design methodology. This is an important concept in engineering, especially in the fields of material science, mechanical engineering and structural engineering.

There are three typical definitions of tensile strength:
* Yield strength - The stress a material can withstand without permanent deformation. For materials without a clear distinct yield point, yield strength is usually stated as the stress at which a permanent deformation of 0.2% of the original dimension will result, known as the 0.2% yield stress".
* Ultimate strength - The maximum stress a material can withstand.
* Breaking strength - The stress coordinate on the stress-strain curve at the point of rupture.

and

Yield strength, or the yield point, is defined in engineering and materials science as the stress at which a material begins to plastically deform. Prior to the yield point the material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed some fraction of the deformation will be permanent and non-reversible. Knowledge of the yield point is vital when designing a component since it generally represents an upper limit to the load that can be applied. It is also important for the control of many materials production techniques such as forging, rolling, or pressing

In structural engineering, yield is the permanent plastic deformation of a structural member under stress. This is a soft failure mode which does not normally cause catastrophic failure unless it accelerates buckling.

You could get more information from the 2 links below...

Answer 5

Yield Strength Of Steel

Answer 6

Usually tensile strength is referring to how much stress the object can take before it breaks. Yield strength usually refers where the object starts becoming damaged. It will no longer rebound from the force.

Think of a spring. You pull the spring some, let go, then it returns to normal. It hasn't reached its yield strength yet. You pull it further. It deforms and will no longer return to its original shape. You pulled it past its yield strength. Then you pull it even harder. It breaks at its tensile strength.

Also, yielding is not only in tension, but in bending and compression also.

Answer 7

Tensile strength : Upto which Hooke's law is followed

Yield Strength : Start of plastic region.

Answer 8

tensile strength= force/unit area required till fracture.

yield strength= force/unit area required to reach the point where sudden/rapid elongation commences.