The extended use of fibre-reinforced polymers (FRP) throughout industries needs computational models and methods to accompany its development. Especially the difference in material properties and the influence of fibre placement have an effect in production and application.
One of the crucial steps is the moulding process, in which the FRP structure is shaped. In the setting of thermoset-based FRPs, the polymer experiences volume shrinkage due to the curing reaction. This deformation and high temperatures in the mould lead to eigenstresses in fibres and matrix.
To comprehend these processes, on top of a phase-field model we employ a thermo-chemo-mechanical model for curing thermoset-based FRPs. Fibre-matrix interfaces are treated accordingly to the balance equations at singular surfaces to maintain a quantitative behaviour. The exothermic model for the curing process is based on reaction kinetics. For evaluation a set of FRP-based volume elements is used and material properties are provided by molecular dynamics simulations. We apply a phase-field model capturing crack propagation to investigate the influence of eigenstresses on micro-crack formation during the production process.