Correlation Between Analytical and FEA in buckling analysis

Vidyaprakash G S
Vidyaprakash G S Altair Community Member
edited November 2021 in Community Q&A

 I tried correlating critical load -  Analytical ( Euler's formula ) and FEA 1 D beam. But observed large deviation in fixed- fixed and Fixed - pinned condition. If correlation gap is closed , it would be helpful. Attached is my fixed-fixed condition fem file.

Critical load  ( Analytical ) = (( pi * pi )* E* I ) /( Le * Le)

Specifications:

E= 180 GPa ;OD = 38 mm ; ID = 36 mm ; Length = 1762 mm

End Condition Le  Analytical FEA
1) pinned-pinned L 11.372 kN 13.849 kN
2)Fixed-free 2L 2.84 kN 2.86 kN
3)Fixed - pinned L/ sqrt (2) 22.746 kN 34.578 kN
4)Fixed-Fixed L/2 45.49 kN 20920 KN
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Answers

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited November 2021

    You use only ONE element in your FEA? Try with several elements? 5, 10, 15 ?

     

     

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