How can I introduce a stress-strain behaviour law for a material like concrete for example, because when I give a negative stress it does not accept it, it only takes positive values?
Apply it as orthotropic material. Then the modifications can be made
Dear Arun Patil
Thank's for the responce but I need to apply it for Homogenious materials.
I used the stress-strain curve of bending for modelling steel-fibre-concrete:
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