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Issue 14, 2017
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Predicting and assessing rupture in protein gels under oscillatory shear

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Abstract

Soft materials may break irreversibly upon applying sufficiently large shear oscillations, a process whose physical mechanism remains largely elusive. In this work, the rupture of protein gels made of sodium caseinate under an oscillatory stress is shown to occur in an abrupt, brittle-like manner. Upon increasing the stress amplitude, the build-up of harmonic modes in the strain response can be rescaled for all gel concentrations. This rescaling yields an empirical criterion to predict the rupture point way before the samples are significantly damaged. “Fatigue” experiments under stress oscillations of constant amplitude can be mapped onto the former results, which indicates that rupture is independent of the temporal pathway in which strain and damage accumulate. Finally, using ultrasonic imaging, we measure the local mechanical properties of the gels before, during and after breakdown, showing that the strain field remains perfectly homogeneous up to rupture but suddenly gives way to a solid–fluid phase separation upon breakdown.

Graphical abstract: Predicting and assessing rupture in protein gels under oscillatory shear

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Publication details

The article was received on 10 Jan 2017, accepted on 10 Mar 2017 and first published on 13 Mar 2017


Article type: Paper
DOI: 10.1039/C7SM00064B
Citation: Soft Matter, 2017,13, 2643-2653
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    Predicting and assessing rupture in protein gels under oscillatory shear

    B. Saint-Michel, T. Gibaud and S. Manneville, Soft Matter, 2017, 13, 2643
    DOI: 10.1039/C7SM00064B

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