SIMPLE STRESSES IN MACHINE PARTS
The ratio of the increases in length to the original length is known as tensile strain.
Tensile stress st = P/A and tensile strain =
and
Young’s Modulus;
P = Tensile or compressive force acting on the body
A = Cross-sectional area of the body
ℓ = original length
dℓ = Change in length
d = diameter of rivet
t = thickness of the plate
d.t = projected area of the rivet
n = number of rivet per pitch length in bearing.
Thermal stress s =Î .E =a .t.E
Thermal stress is independent of length and cross - section dimensions.
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