for a linear analysis - these materials are typically linear till failure - all you need to is Younge's modulus and Poisson's ratio or shear modulus.
Is the material orthotropic? Is it a lay-up with different angles? If it is just chopped, short fibers you might be able to get away with assuming that the material is isotropic even though it really isn't.
As Bill McEachern says above, all you really need is E & nu (and the density if you are applying gravity) for a linear elastic static problem.
Hi, its long glass fibers and its injection moulded so cant see there being any certain direction/layering of the fibers.
I have tried a few simulations and getting reasonable (expected) results from it so I think all is good.
I will just be sure to take the results as estimates and add a rather large factor of safety.
Cheers for the help.
In addition to what was already said, I strongly suggest to do a quick Google search and try to find some interesting articles about this topic:
1) On the simulation of short fiber reinforced engine components
That's a pretty serious subject especially if you're looking for realistic results, otherwise you're right about large FOS assumption.