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Diagrams and Calculator Inputs
 Shaft Diameter D  
 Groove Depth t  
 Groove Radius r  
 Distance between Grooves d D - 2t

Stress Concentration Factors

Input data
D = 100 mm
t = 10 mm
r = 10 mm
Answer
 1.92
 
 3.75
 
Note that the stress concentration factors are calculated from experimental data using curve fitting, so only two decimal places are given.