I am trying to figure out am I doing this calculation correctly.
To get the maximum shear stress for a solid cylindrical pipe I need two formulas:
Moment of inertia = pi/2*r^4
Not sure what this formula is called but its:
max = T*r/ Moment of inertia
I tried to calculate these numbers for a solid shaft that is 20mm in diameter with a torque of 1255nm.
Pascals = 99869726.7902 MegaPascals = 99.87
The material that I have has a yield strength of 490 MPa.
Is the calculation saying that even at 20mm radius the stress will be below the 490MPa that would cause this pipe fail elastically?