Can be assumed, that all default materials in the SOLIDWORKS material database are isotropic.

So is it possible to define the material? orthotropic, that is, representing different physical properties in different directions? An example of such a material is wood, whose properties differ significantly in the longitudinal and transverse directions.

Well, such properties can be described.

However, the condition is earlier activation Simulation add-in and creating the study. You cannot define such material directly in the SW window.

In customized materials (with the possibility of editing) you can select from the drop-down list orthotropic. Then you need to indicate the plane defining the directions and determine the coefficients in each of them.