How to model non-linear orthotropic material in Optistruct Non-Linear Solver

Hi Everyone, can someone help me regarding how to model non-linear orthotropic material in the optistruct non-linear solver?
I have 2 stress strain curves. One "stiffer" curve for in-plane behaviour, and one curve at approx 1/3rd of the stiffness, for out of plane behaviour.
In Optistruct itself the Mat9Orth only allows for linear material properties. I tried multiscale designer, but I wasn't able to figure out the unit-cell that could be representative, nor the way to use the inverse characterization to come to something useful.
Anybody who can help here?
Answers
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Orthotropic material with plasticity is not yet supported in Optistruct as well as Multiscale designer.
Isotropic material supports plasticity which can be defined in MATS1 card.
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Thanks for the reply. That's a real pity.
I will have to research then if it's possible when switching to Radioss.
Kind regards
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