TORSIONAL AND BENDING STRESS IN MACHINE PARTS
Torsional Stress
where,
ζ = Torsional shear stress induced at the outer surface of the shaft.
r = Radius of the shaft.
T = Torque or twisting moment.
J = Second moment of area of the section about its polar axis.
C = Modulus of rigidity.
l = length of the shaft.
θ = Angle of twist in radians on a length
Power transmitted by a shaft (in watts)
N = Speed in rpm
w = Angular speed in rad/s
Bending Stress
where,
M = Bending moment acting at the given section
s = Bending stress
I = Moment of inertia of the crosssection about neutral axis
y = distance from the neutral axis to extreme fibre
R = Radius of curvature of beam.
is known as section modulus.
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