If you expand *Random Lamina* and collapse everything else (by clicking the
sign), you get something like this:

Laminas reinforced with random fibers are isotropic in the plane of the lamina. This means that when a random lamina is stretched or sheared, the deformation (i.e., elongation and/or shear strain) are the same in all directions, just like it happens for an Aluminum plate.

Isotropic materials are described by only 2 moduli, but 3 are listed for convenience: *E*, *G*, and the Poisson’s ratio. One property is redundant, so it can be calculated from the other 2 by using the *famous* formula:

(4.2) |

Finally, the **properties for a lamina reinforced with a textile (fabric)** are shown in section 9.2.