Reinforced Plastics

Informed and impartial coverage on the global composites industry.

Machine Design

How-to, in-depth technical articles for machine design engineers

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Power Transmission

Gear drives, bearings, motors, clutches, couplings, machine controls, sensors and components.

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Diagrams and Calculator Inputs
 Slab Width H  
 Notch Depth t  
 Notch Radius r  
 Distance between Notches d H - 2t
 Slab Thickness h << H

Stress Concentration Factors

Input data
H = 100 mm
t = 10 mm
r = 10 mm
Answer
 2.27  (2.41 in some literatures)
 
 2.83  (3.02 in some literatures)
 
Note that the stress concentration factors are calculated from experimental data using curve fitting, so only two decimal places are given.