Doctorant; H​/F en physico-chimie de la matière molle : Étude multiéchelle des phénomènes de fatigue

Job Title

Thesis subject:
Understanding how disordered materials respond to repeated mechanical stresses is essential for predicting their durability and failure. Even weakly nonlinear deformations can induce microscopic plastic rearrangements, leading to fatigue and the emergence of mechanical memory, but their microscopic origins remain poorly understood. This project aims to establish a quantitative, multiscale experimental framework to link local plastic events to macroscopic fatigue and memory phenomena in disordered materials.

To do this, we will combine rheology, light scattering, and optical imaging to simultaneously probe the mechanical response and microstructural evolution under cyclic loading. By comparing different systems at different length scales, from microscopic rearrangements to the global mechanical response, we seek to identify universal signatures of plasticity, fatigue, and memory, as well as determine how these phenomena are governed by network topology and defect structure.

This work will provide new experimental benchmarks for theories of disordered solids and establish predictive links between microstructure, nonlinear dynamics, and long-term mechanical degradation.

Constraints and risks:

• Level Doctorate/equivalent degrees
• Specialization General training

• French Threshold