Hi Reza,

I haven’t used Damage Evolution Laws in my work, where we are only concerned with staying well below failure limits.

Have you read the ANSYS Help on Damage Evolution?

You say you have an Orthotropic material. Is that the bulk properties of a carbon fiber composite layup? 

I think you need to use the Layered feature of the shell elements to define the individual layers in the layup so that tensile and compressive failure limits of the fiber can be tracked for each layer as well as bond shear failure between layers.

Merry Christmas!