Define stress and explain the types of stress.

Explanation

Stress : When a body is subjectet to a de-
forming force, then restoring forces will
develop inside the body. These restoring
forces will oppose any sort of change in unit
area of the surface is called stress.
Stress : Stress is defined as force applied per
unit area.
`"Stress"=("Force")/("Area")=(F)/(A)`
`D.F.=ML^(-1)T^(-2)" , Unit : "N//m^(2)(or)` Pascal.
Types of stress : It is of three types. They
are : 1) Longitudinal stress 2) Tangential
stress `(or)` Shear stress 3) Volumetric stress.
Longitudinal stress : If the force applied on
a body is along its lengthwise direction then
it is called longitudinal stress. It produces
deformation in length.
`"Longitudinal stress"=("Force")/("Area")` (along
lengthwise direction)
Tangential stress (or) Shear stress : Force
applied per unit area parallel to the surface
of a body trying to displace the upper layers
of the body is called Shearing stress.
Shear (or) `"tangential stress"=("Force")/("Area")`
(Parallel to the surface layers)
Volumetric Stress : If force is applied on all
the sides of a body or on the volume of a body
then it is called volumetric stress.
`"Volumetric stress"=("Force")/("Area")` (applied on
volume)