How to do a Prestressed modal analysis with optistruct?

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello everyone,

I want to do a prestress modal analysis? However, I don't know how to set up the case. Is there any example? Thank you

 

Best Wishes

Roy

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2017

    Hi @Roy Duan

    Yes, you can perform PreTension Modal analysis through HM-OptiStruct using STATSUB (PRELOAD) case control command.

     

    You need to create two load steps, the first step can be Linear Static analysis

     

    In the second load step which is Normal modes, pick the previous Linear Static analysis under STATSUB(PRELOAD) as shown below:

     

    SUBCASE 1
        ANALYSIS = STATICS

    SUBCASE 2
        ANALYSIS = MODES
        STATSUB(PRELOAD) = 1
        SPC = 2
        METHOD = 3
     

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