2. Deformation of Material Components under
load during service - static and dynamic loads
P, weight of Fan
A A
A A
P
P
A A
3. A
P
σ = lim0A
A
dA P
2
4P P
A d
σ =
The stress, σ, at any point O on the section AA within the
cylindrical body is defined by considering a small area, ΔA,
around the point O on plane AA and finding the resultant of
the distributed force, ΔP, acting in that area ΔA. The stress, σ,
at point O on plane AA is given by,
5. Load- Extension Behaviour
Ideal Brittle Material Ductile Material
Standard Specimen
Necking
Gage length and cross section
of the specimen is specified
in the standards like IS, ASTM,
DIN, BS etc.
The Test is often carried out by moving the cross head with a certain
velocity or imposing a certain strain rate