Difference Between Stress and Strain in Strength of Materials
In mechanics of solids, the knowledge of difference between
stress and strain is very important. When an external force is applied on a
body, it starts to deform. the external force applied on the body induces a
resisting force within the body, when this resisting force is taken on unit
area is called stress. There is a change in the dimension of the body due to
the induced stress. The ratio of this change in dimension with the original
dimension of the body is called strain.
stress and strain is very important. When an external force is applied on a
body, it starts to deform. the external force applied on the body induces a
resisting force within the body, when this resisting force is taken on unit
area is called stress. There is a change in the dimension of the body due to
the induced stress. The ratio of this change in dimension with the original
dimension of the body is called strain.
Difference Between Stress and Strain in Tabular Form
S.no

Stress

Strain

1.

Stress is defined as the resisting force per unit area.

Strain is defined as the deformation per unit area.

2.

The ratio of resisting force ( or applied load) to the cross section
area of the body is called stress. 
The ratio of change in dimension of the body to the original
dimension is called strain. 
3.

Stress is denoted by the Greek symbol ‘σ’ ( sigma).

Strain is denoted by the symbol ‘e’.

4.

The formula of stress is given by

The formula of strain is given by

5.

The unit of stress is N/m2 or N/mm2.

Strain is a unitless quantity.

6.

Stress can exist without strain.

Strain cannot exist without stress.

7.

The various types of stress are: tensile stress, compressive stress and shear stress.

The various types of strain are: tensile strain, compressive strain, shear strain and volumetric strain.

Comparison Between Stress and Strain
The various comparison between stress and strain are as follows:
 Stress is the resisting force per unit area where as strain
is the deformation per unit area.  The stress is given by the ratio of resisting force to the cross
section area of the body. The strain is given by the ratio of change in
dimension to the original dimension.  The stress is denoted by the symbol ‘σ’ and strain by ‘e’.
 The unit of stress is N/m2 or N/mm2
whereas the strain does not have units.  The stress can exist without strain but the existence of
strain without stress in not possible.
This is all about the difference between stress and strain
in strength of materials. If you find any suggestion regarding this article
than you can comment us. If you found this article informative or useful than
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in strength of materials. If you find any suggestion regarding this article
than you can comment us. If you found this article informative or useful than
don’t forget to share and like.