Strain in Physics
(Types of Strain in Physics)
Strain in Physics (Types of Strain in Physics)
The ratio of change in dimension to the original dimension is called strain.
Strain formula (Strain in Physics)
Strain = change in size of the object / initial size of the object
It is a unitless and dimensionless quantity.
Type of Strain
There are three types of Strain :-
- Longitudinal strain
- Volume/Volumetric strain
- Shear strain
(1). Longitudinal Strain
A longitudinal strain is defined as “Change in length to the original length of an object”
Longitudinal Strain = change in length of the object / initial length of the object
Longitudinal Strain = ΔL/L
(2). Volume Strain
A volume strain is defined as “Change in volume to the original volume of an object”
Longitudinal Strain = change in volume of the object / initial volume of the object
Volume Strain = ΔV/V
(3). Shear Strain
When the deforming force is applied parallel to the surface of a body, then its shape (not size) changes. The strain produced in this way is known as shear strain.
We can define shear strain as “the strain produced due to change of shape of a body is known as shear strain”.
Shear Strain = displacement of upper face / perpendicular distance between two faces
As angle 
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