nonlinear material analysis Param cards

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

Hi,

 

I want to run a simple model from hypermesh using the nonlinear static nastran solver (106).

I initially ran an inertia relief analysis then took the accelerations in the f06 file and applied them back into the model and placed a three -point constraint and they successfully saw no forces when i ran it in linear static analysis.

 

My problem is that I don't know which param/control cards i need to use to set up the nonlinear material analysis once I've defined my material. Can someone point me at something that might have the answer?

 

Thanks

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2016

    Hi SSnell,

     

     Are you running the the non linear material analysis in OptiStruct?

     

    If yes, you can use MATS1 to define NL material parameters.You can refer to this tutorial\ in OptiStruct help:

    OS-1365: NLSTAT Analysis of Solid Blocks in Contact

     

     

  • SSnell
    SSnell Altair Community Member
    edited September 2016

    Hi & thanks,

     

    No I'm running it in nastran but can try optistruct if there is a useful tutorial

     

    thanks!

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2016

    Please refer to the tutorial to which I was pointing to in my previous reply.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2016

    Optistruct is similar (if not the same) as Nastran for creating cards for material non-linearity.

     

    For material non-linearity in Nastran you'll need a MATS1 card which will reference a TABLES1 card.

    In the TABLES1 card you input your points for a stress strain curve. The first point after 0,0 must equal the yield stress you've defined in the MATS1 card. Both these cards are easily created from within the Hypermesh program.

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