Update Irradiation damage.rst

The thermal properties such as thermal expansion coeeficient, thermal conductivity and specific heat are obtained from literature. In particular, the thermal conductivity (f(dpa, temperature)) of tungsten armour are obtained from the effective thermal conductivity derived from the RVE thermal simulations (F) modelled with irradiation-induced defects. While, the thermal conductivity (f(dpa, temperature)) of copper interlayer and CuCrZr coolant pipe are obtained both from literature and based on some assumptions.

The thermal boundary conditions imposed across the monoblock is depicted in :numref:`Fig. %s <Monoblock1>`.

.. _Monoblock1:

.. figure :: https://gitlab.com/ibsim/virtuallab/-/raw/SM_irradiation_container/Figures/thermal.png

    Thermal boundary conditions of Tungsten monoblock.

The mechanical boundary conditions imposed across the monoblock is depicted in :numref:`Fig. %s <Monoblock2>`.

.. _Monoblock2:

.. figure :: https://gitlab.com/ibsim/virtuallab/-/raw/SM_irradiation_container/Figures/mech.png

    Mechanical boundary conditions of Tungsten monoblock.