Stress and Strain

Stress – Restoring force per unit area of strain of cross section acting in scientific material is called Stress.

Stress= F/A

SI Unit – N/m2 or pascal
Stress is neither a scalar nor a vector stress is a tension of rank 2
Note – Tension having rank 0 is called scalar and having rank 1 is called vector.

Strain
The deformation produced in a material body by deforming force is called strain.
(i) Fractional change in length in a material is called longitudinal strain.
= change in length/original length
(ii)Fractional change in volume of a material body due to hydraulic deforming force is called hydraulic strain.
= change in volume/original volume.
(iii) Lateral shift between the adjacent layer of material body separated by unit length is called Tangential strain or shearing strain.
Note. strain is a ratio so it have neither dimensions nor units

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s