Ey and Ez are very small compsred to Ex in UD composites. But they should not be zero, but have the E of the matrix material. I think you could use a small value, such as Ey=Ez=Ex/100

In general for unidirectional ply, on has longitudinal Ex and transverse Ey, and consequently Gxy. These elastic constants are governed by the fiber and matrix properties. 

If one assumes the simplest (zero-order) model, which is a monotropic model that ignores the stiffness of the matrix and assumes that the ply works only along the direction of the fiber, then one has only the longitudinal Ex, while the rest are zeros.

Thanks a lot for your answers.

taking Ey and Ez equals to zero may not be a good choice. you can take values from available literature. you can check attachments...

regards Piyush

Hi Hamed,

I suggest use this computational tool for calculation of lamina and laminate properties

http://en.cadec-online.com/Default.aspx

Ey and Ez are not zero for UD composites, refer Analysis and Performance of Fiber Composites, 3rd Edition. For shear strength calculation refer "The Theory of Materials Failure" by Christensen, Richard M.

Thank you @Prashob