MAT9 Material Failure Card Requirments

John Duff_21716
John Duff_21716 Altair Community Member
edited January 2022 in Community Q&A

What is the minimum real-world material data is required for a MAT9 cards to run successfully without errors?

https://2021.help.altair.com/2021.2/hwsolvers/os/topics/solvers/os/matt9_bulk_r.htm?zoom_highlight=mat9

In the example given in the OptiStruct page there are values for G11, G14, G22, G55, A5, GE, only why is this, are these the minimum required data for the card?

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Best Answer

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited January 2022 Answer ✓

    if you're using MAT9 i believe that you need to supply all the 21 material constants.

    Also there are some stabilityi checks for the material, based on the eignevalues of the G matrix.

    Another alternative to MAT9 is MAT9OR which is based in engineering constants (E1, E2, E3,....).

    image

Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited January 2022 Answer ✓

    if you're using MAT9 i believe that you need to supply all the 21 material constants.

    Also there are some stabilityi checks for the material, based on the eignevalues of the G matrix.

    Another alternative to MAT9 is MAT9OR which is based in engineering constants (E1, E2, E3,....).

    image

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