Travail de fin d'études et stage[BR]- Travail de fin d'études : Modelling of composite pressure vessels (carbon-epoxy COPV) for the FEM approach[BR]- Stage

Abstract

Facing the energy crisis and the necessity to reduce CO2 and greenhouse gas emissions, hydrogen has emerged as a key option in the decarbonization of fields such as aerospace and automotive. Indeed, hydrogen constitutes a solution in the storage and transportation of energy. Typically, hydrogen is stored in Composite Overwrapped Pressure Vessels (COPVs) which have a better strength-to-weight ratio than traditional metallic pressure vessels. However, COPVs are still subject to improvement in the filament winding process which is greatly responsible for the damage resistance and the fatigue behavior. This Master thesis addresses the implementation of a model predicting the evolution of the winding angle on the dome of cylindrical pressure vessels. The winding angle is an important parameter in the determination of the mechanical behavior of composite pressure vessels. In order to enlarge the possibility of winding trajectories, non-geodesic winding is implemented in MATLAB. The solution of the non-geodesic equation is computed using the 4th-order Runge Kutta method with a constant discretization over the dome profile. Then, the approach is extended to a multi-layer structure predicting the winding angle on an arbitrary pseudo-ply different from an ellipse. Finally, a methodology to mesh a lay-up is implemented by defining the nodes, the elements, and the winding angle associated with each element. The finite element model is then exported in SAMCEF BACON for later simulations. This results in a more realistic dome modelling by considering the different plies and the non-geodesic trajectories in the filament winding process.