BASICS OF STRENGTH OF MATERIAL

THIS ARE THE SOME IMPORTANT DEFINITION AND KEY POINT OF STRENGTH OF MATERIAL

 

Stress - The stress applied to the material is the force per unit area applied to the material 

{ the maximum stress a material can be stand before it breaks is called the breaking stress or ultimate tensile stress }

Formula for the stress is 

                                STRESS = FORCE/ AREA = F/A ( NM^-2 or PASCAL )

F = Force in newton (N)

A= Cross-sectional area in M^2

 

 

Strain - The ratio of extension to original length is called Strain it has no unit cause it is just a ratio of two length's measured meter's . 

STRAIN = Extension/length 

strain =  ΔL/L 

ΔL = Extension measured in meter 

L = Original length measured in meter

Stress - strain graph for ductile metal (like copper)

 

 

 

 

 

 

 

 

 

OA - Proportional limit Hook's law is applicable till A point

A - Elastic limit 

B - Yield stress point/ upper yield stress point 

C - Lower yield stress point

D - Ultimate stress point

E - Breaking  point breaking stress .