LINEAR STATIC

NoorAlam_08
NoorAlam_08 Altair Community Member
edited October 2020 in Community Q&A

Hello everyone

Good morning

 

i am doinig linear static analysis in optistruct. At first i have run it with first order tetra mesh then i have run it again with second order tetra mesh.i have get both result and both are different.can anyone suggest me, is first order tetra mesh give accurate value of stress(result) or second order tetra mesh.

 

regard

Noor Alam

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2018

    Hi @NOOR ALAM ANSARI

     

    How big is the difference?

     

    Does your problem involve contacts?

     

    2nd order is more accurate over 1st order, but not in all cases. For example, 1st order performs better when you have contacts. 

     

    If your problem involves bending, incompressibility 2nd order is accurate.  

  • NoorAlam_08
    NoorAlam_08 Altair Community Member
    edited October 2018

    hi Prakash

     

    i am simulating it without contact.

    1.At first order tetra result is stress is 291.3 MPa. here (Hyperview averaging is none), but when i am set the averaging method advance the stress is suddenly reduced 204.5 MPa.

    2.At second order tetra mesh the stress is 335.1 MPa.Here stress is same at averaging method None/Advanced in hyperview.

     

    my problem is involved with bending.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2018

    could you show result pics and load pics? 

    you have more grids in your model now and it can change your loading.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2018
    Altair Forum User said:

    could you show result pics and load pics? 

    you have more grids in your model now and it can change your loading.

    Good point, is the amount of load same in both cases?

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