# STRESS CONCENTRATION FACTORS FOR A RECTANGULAR HOLE IN INFINITE PLATE

Theoretical stress concentration factors (Kt) of rectangular hole with round corners in infinite plate can be calculated by this calculator for tension loads. In addition to stress concentration factor calculation, the calculator can be used to find maximum stress values at the edge of the hole if loading parameters are known. See footnotes of the "Results" table for the necessary equations for the stress calculations.

There exist some validity conditions for the equations which are used in the calculations. If input parameters don't satisfy validity conditions of equations, a warning message is given by the calculator.

The formulas and parameters used in the calculator are given in " List of Equations " section of this page.

##### Calculator:

 INPUT PARAMETERS Parameter Symbol Value Unit Rectangle height 2a mm cm m inch ft Rectangle width 2b Corner radius r Axial stress σ1 MPa psi ksi
###### Note: Use dot "." as decimal separator.

 RESULTS LOADING TYPE - AXIAL STRESS Parameter Symbol Value Unit TENSION STRESS Stress concentration factor * Kt --- --- Maximum tension stress σmax --- MPa psi ksi

##### Definitions:

Stress Concentration Factor: Dimensional changes and discontinuities of a member in a loaded structure causes variations of stress and high stresses concentrate near these dimensional changes. This situation of high stresses near dimensional changes and discontinuities of a member (holes, sharp corners, cracks etc.) is called stress concentration. The ratio of peak stress near stress riser to average stress over the member is called stress concentration factor.

Kt: Theoretical stress concentration factor in elastic range = (σmaxnom)

##### List of Equations:

 Tension

##### Reference:
• Young, W. C., Budynas, R. G.(2002). Roark’s Formulas for Stress and Strain .7nd Edition McGraw-Hill