what is strain ? what is it's unit in SI system ?
Answers
Answer:
The unit for strain in the SI (Système International) is “one” i.e. 1 ε= 1 = 1 m/m. In practice, the “unit” for strain is called “strain” and the symbol e is used. Usually, strain is in the order of um/m, i.e. 10-6, and therefore, the unit “µε” (microstrain) is most commonly used.
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➦ The Strain is defined as the response of a system to an applied stress. When a substance or a material is loaded with a force, it produces a stress, which then causes that material to deform. Strain is defined as the amount of deformation of a material in the direction of the applied force divided by the initial length of the material.
Types of Strain in a material:
Longitudinal strain: If the deforming force produces a change in length alone, the strain produced in the body is known as the longitudinal strain or the tensile strain.
It is given as:
=> ε=Δl/l
=> Where,
=> εV is the longitudinal strain due to stress applied
Δl is the change in length
l is the original length of the material.
Volumetric strain: If the deforming force produces a change in volume alone, the strain produced in the body is known as the volumetric strain.
It is given as:
= εV=ΔVV
Where,
εV is the volumetric strain due to stress applied
ΔV is the change in volume
V is the original volume of the material.
Shear strain: The angle tilt caused in the body due to tangential stress expressed is known as the shear strain.
It is given as:
=> γ=Δx/l
Where,
=> γ is the shear strain due to stress applied
Δx is the change in angle
l is the length of the material.
=> Unit of strain:
The unit of strain is one, as Strain is the ratio of similar quantities.
=> Dimension of strain:
The strain is a dimensionless quantity as it only defines the relative change in shape of an object.
We know that, the Strain is the relative change in the shape and size of a body due to the applied force