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 .

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