are material properties different for each direction or are they changing along a single direction? In other words, if you take a very small sample, are the properties fixed along x direction or are they changing? I am assuming the material properties are same in y and z direction, and different in x direction, is that right? If yes, you can use orthotropic material properties, and use element orientations to define x y z directions at the element level to achieve this. https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/wb_sim/ds_element_orientation.html
-Aniket
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