Difference between Stress & Strain
When a body is made to change its length, volume or shape by the application of an external force, the opposing force per unit area is called Stress.
Formula:
Stress = Force / Area
o = F/A (Here o represents (Rho) do not write in your examination paper)
Units:
– S.I or M.K.S System – N/m2 or Pascal (Pa)
– C.G.S system – Dyne/cm2
– F.P.S or BE System – lb/ft2 and lb/in2
(Here 2 in all above systems shows square)
Following are some types of stress:
- Tensile Stress: It is a stress tending to stretch a body.
- Bulk Stress: It is an overall force per unit area, also known as pressure.
- Shear Stress: It is a stress tending to produce an angular deformation.
Strain:
Stress can produce a change in shape, volume or length in an object. This change in the shape of an object is called strain.
Formula:
Mathematically,
Strain = Change in Length/Length or Strain = Change in volume / volume
Units:
2 Since strain is a ratio between two similar quantities, it has no unit.
Following are some types of strain.
- Tensile Strain: It is a change in length divided by original length.
- Bulk Strain: It is the change in volume divided by original volume.
- Shear Strain: It is equal to the angular displacement produced.
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