Nonlinear Material for different behavior in tension and compression

John Crowder
John Crowder Altair Community Member
edited June 2021 in Community Q&A

I am trying to model a material in Radioss that behaves elastically differently in tension and compression. What material card should I use to model this? It seems like the Ogden materials are all incompressible. Is there a material you could use to model this in Optistruct as well? Thanks, picture of the stress/strain plot below. 

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Answers

  • Rogerio Nakano_21179
    Rogerio Nakano_21179 New Altair Community Member
    edited June 2021

    Hi

    There is not material law with that behavior for Radioss.

    One alternative is to use /MAT/LAW25 and for the softer direction, e.g. compression, you set the plastic work parameters to attempt to mimic the lower modulus behavior.

    I hope this is helpful.

    Regards

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