Modelling real microstructures from RX micro-tomography images for robust FEM simulation of coupled multi-physics phenomena
RX microtomography has become an essential technique for the investigation of materials behaviour, particularly concerning damage and durability issues. This technique has been successfully employed for example to describe the morphology of cracks and defects for several classes of materials (composites, polymers and metal alloys), but has been little used in the context of the characterization of the degradation phenomena associated with exposure to aggressive environments, aging and multiphysics couplings. The Pprime Institute in Poitiers – thanks to the recent acquisition of X-ray micro-tomographic facilities (partly financed by Equipex Gap Program)- has already acquired a number of skills in the use and analysis of these data, especially concerning (area cracked surfaces, lengths of cracks, porosity rate …).
To go further in the use of the segmentation of images and quantitative analysis of the evolution of defects during testing, it is essential to build realistic finite element models starting from microstructures obtained by X-ray micro-tomography images. Building of such models requires the development and the implementation of a number of advanced tools for segmentation, mesh, and specific numerical skills. This action is expected to provide simulations of coupled thermo-diffuso-mechanical behaviour in order to clarify the effect of the microstructure of the material on the degradation phenomena related to exposure to aggressive environments.