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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2018

Microscopic dynamics and failure precursors of a gel under mechanical load

Stefano Aime
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Laurence Ramos

Résumé

Material failure is ubiquitous, with implications from geology to everyday life and material science. It often involves sudden, unpredictable events, with little or no macroscopically detectable precursors. A deeper understanding of the microscopic mechanisms eventually leading to failure is clearly required, but experiments remain scarce. Here, we show that the microscopic dynamics of a colloidal gel, a model network-forming system, exhibit dramatic changes that precede its macroscopic failure by thousands of seconds. Using an original setup coupling light scattering and rheology, we simultaneously measure the macroscopic deformation and the microscopic dynamics of the gel, while applying a constant shear stress. We show that the network failure is preceded by qualitative and quantitative changes of the dynamics, from reversible particle displacements to a burst of irreversible plastic rearrangements.

Dates et versions

hal-01904079 , version 1 (24-10-2018)

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Stefano Aime, Laurence Ramos, Luca Cipelletti. Microscopic dynamics and failure precursors of a gel under mechanical load. Proceedings of the National Academy of Sciences of the United States of America, 2018, 115, pp.3587. ⟨10.1073/pnas.1717403115⟩. ⟨hal-01904079⟩
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