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2.2.3 Tutorial 3 - Kandil-Brown-Miller Model with Component Stresses and Strains

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This tutorial provides a step-by-step demonstration for Kandil-Brown-Miller fatigue analysis using Fatigue+.


A mechanical component has been analyzed for cyclic loading with an FEA software.  The 6-component total strains in the order of εx,εy,εz,γxy,γyz,γxz are partially listed below:


  0.61350E-03 -0.17198E-02  0.47414E-03  0.51819E-03   0.0000       0.0000   

  0.95818E-03 -0.26858E-02  0.74040E-03  0.79499E-03   0.0000       0.0000   

  0.62699E-03 -0.17230E-02  0.46970E-03  0.51796E-03   0.0000       0.0000   

 -0.75123E-03  0.22369E-02 -0.63671E-03 -0.61980E-03   0.0000       0.0000   

  0.10549E-03 -0.16666E-03  0.26215E-04  0.68087E-04   0.0000       0.0000   

 -0.37733E-03  0.12593E-02 -0.37799E-03 -0.34273E-03   0.0000       0.0000  

  0.74740E-03 -0.19171E-02  0.50130E-03  0.56790E-03   0.0000       0.0000   


The complete data are saved in the Component_strain.txt.


Import the stresses and strains from the data files to Fatigue+ and calculate fatigue life of the mechanical component using Kandil-Brown-Miller model.  Use normal strain sensitivity coefficient 1.0.  The beneficial effect of compressive strains is not considered.  The material is Aluminum 2024-T351.  Use surface condition factor 0.80 and fretting condition facto 0.90. Use stress safety factor 1.0 and load cycle safety factor 1.0.




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