Non-linear material data entry in Radioss

Rachit Semalty
Rachit Semalty Altair Community Member
edited March 2022 in Community Q&A

I have a set of stress vs strain for a non-linear elastic-plastic material. How may I create a material in radioss for the same?

I have used M36_PLAS_TAB and input the data in fct_ID_E, but the solver is showing following error: 

ERROR ID : 975
** ERROR IN MATERIAL FUNCTION DEFINITION
DESCRIPTION :
YOUNG�S MODULUS SCALE FUNCTION SHOULD DECREASE WITH PLASTIC STRAIN

 

Please try to help ASAP.

Regards,

Rachit

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Best Answer

  • PaulAltair
    PaulAltair
    Altair Employee
    edited March 2022 Answer ✓

    fct_ID_E is used to scale modulus as a function of plastic strain, that isn't what you want I don't think

    If you have a material stress/strain curve (this should be true stress vs true plastic strain and should be monotonically increasing) you would enter that as fct_ID1

    If you have multiple curves for strain rate dependent data, that can be entered using fct_ID2, fct_ID3 etc along with strain rates 1,2,3 etc

Answers

  • PaulAltair
    PaulAltair
    Altair Employee
    edited March 2022 Answer ✓

    fct_ID_E is used to scale modulus as a function of plastic strain, that isn't what you want I don't think

    If you have a material stress/strain curve (this should be true stress vs true plastic strain and should be monotonically increasing) you would enter that as fct_ID1

    If you have multiple curves for strain rate dependent data, that can be entered using fct_ID2, fct_ID3 etc along with strain rates 1,2,3 etc

  • Rachit Semalty
    Rachit Semalty Altair Community Member
    edited March 2022

    Thank you very much. You are correct.

     

    Regards,

    Rachit

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