FR-4 is not included in our material library. The base for our library is largelly MIL Handbook 5. I did find this paper, where an analysis is done with FR-4 as the PCB layer, it has a Modulus, Poisson's Ratio, and thermal expansion number, I don't know if they are correct, but it's a starting point.
There's a NASA report with some FR-4 properties here -
Please be cautious using any data like this, one difficulty in FEA is finding the correct material properties to use.