More Information.

Combined Stresses and Deflection in the Shaft of a Driven Screw.



Bearing at Both Ends
Cantilevered
Density (kg/m3)*
Flight OD (mm)
Flight Thickness (mm)
Flight Pitch (mm)
Screw Length (mm)
Power (kW)
Machine Speed (rpm)
Centre Tube OD (mm)
Centre Tube ID (mm)
Young's Modulus (GPa)

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Notes

* This is the density of the screw's material of construction.

This script calculates the stresses in a driven shaft due to the combined effects of torque and bending. In the case of a shaft supported between two bearings the script calculates the shear and bending stress at intervals of 0.1 mm and returns the maximum value found.

For a solid shaft enter 0 in the 'Centre Tube ID' text box.

The calculation only applies to screws with a constant pitch and constant centre tube dimensions (uniformly distributed load). If you're applying the program to a variable pitch screw you can use the average pitch for calculating the weight and get a conservative answer that way. If you want to calculate the combined bending and shear stress in a screw with variable pitch and a stepped shaft all I can say is good luck!

Density and Young's Modulus 304 Stainless Steel 316 Stainless Steel Duplex Hastelloy Carbon Steel

If you're using a nominal bore tube click on a button below to get the tube dimensions

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Combined Shear and Bending Stress



This page can be used to calculate the maximum combined shear and bending stress in a driven screw feeder of screw conveyor shaft. For a cantilevered shaft the maximum stress occurs at the drive end. For a simply supported shaft (bearing at both ends) the program calculates the stress starting at the drive end and repeats the calculation every 1mm along the length of the shaft until a maximum value is reached.

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