Stress Concentration Factors for Flat Plates and Cylinders 
In a structure or machine part having a notch or any abrupt change in cross section, the maximum stress will occur at this location and will be greater than the stress calculated by elementary formulas based upon simplified assumptions as to the stress distribution. 

Rankine Gordon Equation 
The Rankine Gordon equation which is a semiempirical formula, and takes into account the crushing strength of the material, its Young's modulus and its slenderness ratio. 

