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Fatigue refers to the changes in material properties caused by repeatedlyapplied loads. It has been widely studied for, e.g., construction materials,but much less has been done on soft materials. Here, we characterize thefatigue dynamics of a colloidal gel. Fatigue is induced by large amplitudeoscillatory stress (LAOStress), and the local displacements of the gel aremeasured through high-frequency ultrasonic imaging. We show that fatigueeventually leads to rupture and fluidization. We evidence four successive stepsassociated with these dynamics: (i) the gel first remains solid, (ii) it thenslides against the walls, (iii) the bulk of the sample becomes heterogeneousand displays solid-fluid coexistence, and (iv) it is finally fully fluidized.It is possible to homogeneously scale the duration of each step with respect tothe stress oscillation amplitude $\sigma_0$. The data are compatible with bothexponential and power-law scalings with $\sigma_0$, which hints at two possibleinterpretations in terms of delayed yielding in terms activated processes or ofthe Basquin law. Surprisingly, we find that the model parameters behavenonmonotonically as we change the oscillation frequency and/or the gelconcentration.

Multiple yielding processes in a colloidal gel under large amplitude oscillatory stress