Are you defining orthotropic material?
Orthotropic material data requires nine values to be fully described, namely three Young’s moduli (Ex, Ey, Ez), three Poisson’s ratios (vxy, vyz, vxz), and three shear moduli (Gxy, Gyz, Gxz). Usually X is considered fiber direction, Y is transverse direction and Z is the thickness/orientation direction.Â
Usually EX greater than or equal to EY
EY should be greater than or equal to EZ
By default all elements use the Global X, Y and Z directions for the element coordinate system.
You can change this and define "element orientation" for selected bodies in the Geometry tree in mechanical. Or you can build the composite in ACP Pre where you can assign the materials ans define the element orientation. If this is not what you are looking for, please provide more details about the material and the process you are using