Personal web page : http://iramis.cea.fr/Pisp/2/daniel.bonamy.html
Laboratory link : http://iramis.cea.fr/spec/SPHYNX/
More : http://iramis.cea.fr/nimbe/lions/
The clean-up and dismantling operations of the former nuclear research facilities generate large amount of waste which must be transported in complete safety to the centers for storage and/or treatment. Transport packages are multilayer, waterproof devices, designed to stop ionizing radiation, but also to resist mechanical shocks, punching, thermal constraints, etc. These constraints make current packages very heavy, difficult to handle, and increase the doses received during their handling.
This thesis project aims to design a new class of materials for transport packages, both ultra-light and compatible with the mechanical / thermal constraints encountered. In this context, microlattice-type metamaterials (formed from periodically arranged microtubes) prove to be promising: In addition to being much lighter than massive materials (several orders of magnitude!), they seem to offer higher compressive strength . the goal is first to understand why microlattices exhibit such a high compressible strength , and then to develop the proper tools to optimize the lattice architecture in this context. In particular, in a bio-inspired approach, we will explore the potential brought by random and hierarchical architectures. The study will be based on numerical approaches of “Lattice beams model” with increasing complexity. These approaches will be qualified through experiments carried out on metamaterials obtained by additive printing. This thesis is backed by another more chemistry and materials oriented thesis, aimed at designing the best resin / nanoadditive composites to optimize protection against ionizing radiation, neutrophagic properties and resistance to irradiation.
This thesis subject implies a taste for teamwork as well as an important scientific curiosity and open-mindedness. It brings into play concepts belonging to mechanical engineering, non-linear physics and materials science. The successful candidate will have the opportunity to manipulate the theoretical, numerical and experimental tools used in these three areas. The fundamental and applied nature of this research will allow the candidate to find opportunities at the end of his thesis in the academic world and in industry.