I did some calculations to find out the moment of inertia and physical qualities of some metal.
I am using typical medium carbon steel.
I'll use a density of 7.8 g/m^3 until I get better numbers. There's a solid circular shaft that's 1000mm long The diameter of this shaft is 40mm
This gives me: Polar moment of area 251327 mm^4
The next part is the motor.
This will be a shaft connected to a 15HP 1200RPM motor but I'll be adding a gearbox to bring the RPM down to about 85RPM this will give me about 1256 newtons/meter of force.
I am a bit lost at this junction.
Do I need to convert the newtons to MPa or the Polar moment to some other units?
How do I compare the 1256 newtons to the amount of force this cylinder can withstand 251327 mm^4
would this pipe bend or break under the max torque load?
How can I relate 1256N.m to 251327mm^4 to see if the pipe would break?