**Evaluation of Stress Concentration Factor- Java Applet.**

This applet determines the theoretical stress concentration factors for a stepped circular shaft with a shoulder fillet subject to torsion, or tension or bending. The ratio of the fillet radius to small shaft diameter should not exceed 0.3 and the ratio of the large to small shaft diameters should not exceed 2.5.

Also the difference between the large and small diameters divided by twice th fillet radius should lie in between 0.25 and 4 for the torsion calculations and 0.25 and 20 for the bending and tension calculations.

Enter the values in mm (or all values in the same units) and click on the 'Calculate' button.

These stress concentration factors are for use with the nominal stress calculated using the smaller shaft diameter.
i.e: *shear stress _{nom}=16 Torque/3.1415 d ^{3}*

These calculations are based on information contained in "Roark's Formulas for Stress and Strain", 6th Ed. McGraw Hill, 1989 and also "Stress Concentration Factors", by R E Peterson, John Wiley and Sons, 1974. Both these publications contain information relating to a large number of configurations.

Return to notes on Stress Concentration Factors

David Grieve, 24th August 2000.