#STRESS CONSEPT PART-1

 #Basics of Stress and Strain

-Stress(S)- Amount of force per unit cross-sectional Area

-Strain(e)- Amount of elongation per Unit length of Specimen.

Stress, S= F/A  N/m²

Strain, e = l/L 

Where F= Applied force

            A= Cross Section Area of the Specimen

            L= Length of the Specimen

            l= Elongation of the Specimen

Stress Strain Curve

In the elastic range , stress/strain relation is constant and referred as Hook's Law.

                                                                          E=S/e

And Constant E= Modulus of Elasticity or Young's Modulus. 

Stress and Strains through the testing process are plotted in a chart called Stress-Strain Curve.

Above fig (a) is for law Carbon & low Alloy Steel

 and     fig (b) is for Austenitic Steel

Propotional Limit:

The Curve starts out with a section of straight line- 

                  within the section material strictly follow Hook's Law referred Perfect Elastic Section.

Highest Point of perfect Elastic Section called Proportional Limit .Young's Modulus defend by Straight Section of Curve.