ElastoPlastic Constitutive Model??

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Hi,
Trying to use Elastoplastic Constitutive Model by introducing Stress/Strain Curve (Nonlinear Data Input) for Multiple Temperatures in MSC.Patran.

I have a problem with getting my Stress-Strain curves to look like on the picture in attachment.
Please let me know if you have any advice or example?

Thanks.

 

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And the attachment...