The objective of this postdoctoral position is to propose a suitable modeling methodology for the non-linear static and dynamic mechanical properties of multi-material assemblies (broadly defined). These assemblies may range from the microscopic scale (e.g., particle-filled polymers) and mesoscopic scale to the macroscopic scale, including parts produced via additive manufacturing, such as lattice structures. The modeling will be based on experimental results from static mechanical tests using in situ X-ray tomography, conducted during the postdoctoral appointment. Depending on the scale involved, these experiments will take place either within the laboratory (which is equipped with an in situ X-ray tomography testing machine) or—for the microscopic scale—via synchrotron campaigns to be organized by the candidate. Regarding dynamic behavior, the candidate will incorporate results from other internal studies on the macroscopic behavior of materials or parts obtained through Dynamic Mechanical Analysis (DMA) or vibration testing (using a shaker).