Nonlinear material in HyperMesh for Nastran

Brian_20847
Brian_20847 Altair Community Member
edited March 1 in Community Q&A

Hi experts,

I am doing elasto-plastic material but I am facing this error.

How to solve this problem? Please find the attach to know my model.

Thanks

 

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Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited February 29

    I don't have Nastran here, but if you run the exact .bdf in OptiStruct, it will give you clear error messages:

    It would be helpful to use OptiStruct instead.

     
     *** INFORMATION # 4916
     Hash-table based assembly turned on for LGDISP analysis with RBE2.
      
     *** ERROR # 3002 ***
     The first point (X1,Y1) specified on the TABLES1 bulk data entry ID=1
     is not located at the origin of the stress-strain curve.

    https://altairuniversity.com/wp-content/uploads/2016/10/1189_MATS1-definition-with-TYPSTRN-in-Optistruct1.pdf

     

    As you're using TYPSTRAIN default value, which expects a full total stress x strain curve, the solver is erroring out.

    You have provided only the plastic portion of the curve, meaning you should have used TYPESTRN = 1

    image

  • Brian_20847
    Brian_20847 Altair Community Member
    edited March 1

    Hi @Adriano A. Koga,

    I tried to do this in OptiStruct already but now I want to try with Nastran solver.

    Thanks

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