The research topic concerns the influence of the behaviour of the (U-Pu)O2 agglomerate microstructure on the simulation of fuel shaping through triaxial cell investigations. It is based on multi-scale experimental and numerical studies in order to propose simulations of the shaping of actinide fuels, taking into account the breakage and rearrangement of agglomerates in the behaviour laws VER on homogenised VER. To this end, investigations in triaxial cells are envisaged, on the one hand on VER using X-CT tomography on simulating inactive model powders and on the other hand on industrial-sized samples on real active powders. Fracture tests using X-ray tomography will also be carried out on inactive materials and without tomography on active materials, in order to compare experimental and numerical results in the case of damage to pre-sintered fuels. A comparison will also be planned to take into account the impact of the proposed approach on the parameters of the models currently used for macroscopic simulations of fuel shaping on an industrial scale.