STRESS AND STRAIN

STRESS- As the body undergoes deformation, its molecules setup some resistance to deformation, this resistance per unit area to deformation is known as stress.

                                         

                                             σ=P/A 

           where, P= Load force acting on body

                                   A= Cross section area of body

STRAIN-A single force acts on a body it undergoes some deformation, the deformation per unit length is known as strain.

                                                                   

                                                       ε=δl/l

                          where, δl= change in length of the body

                                        l= original length of the body

 Type of stresses 

     1. Tensile stress 

     2. Compressive stress

1.TENSILE STRESS- When a section is subjected to two equal and opposite pull and the body tends to increase its length, the stress induced is called tensile stress.

2.COMPRESSIVE STRESS- When a section is subjected to two equal and opposite pushes and the body tends to shorten its length, the stress induced is called compressive stress.