To date , The effect of hygrothermal environment on the performance of composite has been investigated by many researchers. but there are little works on the synergistic effects of load+moisture+temperature .
I do not have much experience with the FEM modelling of hygro-thermal effects per se, but I have been working on the topic of temperature effects on the static and fatigue performance of composites for a while now and did some work including moisture and freeze-thaw cycles.
However, it is hard to help much as you do not ask a question on the topic as such... Maybe if you clarify what you want to know, I or someone else might help better?
In the mean time, you may want to have a look at Valeria de la Saponara's profile here on research gate (https://www.researchgate.net/profile/Valeria_La_Saponara). I know she did some work on concurrent thermal and mechanical loads.
Bankim Chandra Ray's profile is also probably worth looking at (https://www.researchgate.net/profile/Bankim_Ray2). He's researched the subject a lot.
If you are considering visco-elasticity and hysteretic self-heating, look at the recent work of Rogier Nijssen and Francisco Lahuerta, They are also both on RG.
An older paper you might want to consider are David A. Dillards thesis at Virginia tech in collaboration with the NASA (Creep and creep Rupture of Laminated Graphite/Epoxy Composites). Look through its literature review for some leads.
There are also many ASTM STPs that are worth reading.