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Plasticity Model for Autofretage of a Cylinder in ANSYS

Dear All,

I am analyzing a steel pressure vessel with autofretage effect in ANSYS. This effect brings the vessel steel fully plastic in the first load step.After the remval of the load in the second step,a permant strain and residual stress remains in the vessel.The residual stress develops compressive stress in the vessel.

As the material has Bauschinger effect,thus the yield in compression is less than in tensiion. A bilinear kinematic hardening material model is used. This  gives accurate results for the loading step but gives higher residual stress in unloading step because of not taking the Bauscinger Effect.

So Is there any material model which can be used for this problem.your help is required.



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