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Multiple yielding processes in a colloidal gel under large amplitude oscillatory stress
Université de Lyon, Lyon, France.
Université de Lyon, Lyon, France.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-1503-8293
Université de Lyon, UFR de Physique, Université Claude Bernard Lyon I, Lyon, France .
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2016 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 12, no 6, 1701-1712 p.Article in journal (Refereed) Published
Abstract [en]

Fatigue refers to the changes in material properties caused by repeatedly applied loads. It has been widely studied for, e.g., construction materials, but much less has been done on soft materials. Here, we characterize the fatigue dynamics of a colloidal gel. Fatigue is induced by large amplitude oscillatory stress (LAOStress), and the local displacements of the gel are measured through high-frequency ultrasonic imaging. We show that fatigue eventually leads to rupture and fluidization. We evidence four successive steps associated with these dynamics: (i) the gel first remains solid, (ii) it then slides against the walls, (iii) the bulk of the sample becomes heterogeneous and displays solid-fluid coexistence, and (iv) it is finally fully fluidized. It is possible to homogeneously scale the duration of each step with respect to the stress oscillation amplitude sigma_0. The data are compatible with both exponential and power-law scalings with sigma_0, which hints at two possible interpretations of delayed yielding in terms of activated processes or of the Basquin law. Surprisingly, we find that the model parameters behave nonmonotonically as we change the oscillation frequency and/or the gel concentration.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 12, no 6, 1701-1712 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-125069DOI: 10.1039/c5sm02587gISI: 000369750400007PubMedID: 26685970OAI: oai:DiVA.org:liu-125069DiVA: diva2:902743
Note

Funding agencies:  European Research Council under the European Unions Seventh Framework Program (FP7)/ERC grant [258803]; Institut Universitaire de France; Agence Nationale de la Recherche [ANR-11-PDOC-027]; Bernt Jarmark Foundation

Available from: 2016-02-12 Created: 2016-02-12 Last updated: 2016-03-08

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Lindström, Stefan B
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