  A coupled hygro-thermo-mechanical computational model is proposed for fibre
reinforced polymers, formulated within the framework of Computational
Homogenisation (CH). At each macrostructure Gauss point, constitutive matrices
for thermal, moisture transport and mechanical responses are calculated from CH
of the underlying representative volume element (RVE). A degradation model,
developed from experimental data relating evolution of mechanical properties
over time for a given exposure temperature and moisture concentration is also
developed and incorporated in the proposed computational model. A unified
approach is used to impose the RVE boundary conditions, which allows convenient
switching between linear Dirichlet, uniform Neumann and periodic boundary
conditions. A plain weave textile composite RVE consisting of yarns embedded in
a matrix is considered in this case. Matrix and yarns are considered as
isotropic and transversely isotropic materials respectively. Furthermore, the
computational framework utilises hierarchic basis functions and designed to
take advantage of distributed memory high-performance computing.
