Abstract
Amorphous solids such as coffee foam, toothpaste, or mayonnaise display a transient creep flow when a stress is suddenly imposed. The associated strain rate is commonly found to decay in time as , followed either by arrest or by a sudden fluidization. Various empirical laws have been suggested for the creep exponent and fluidization time in experimental and numerical studies. Here, we postulate that plastic flow is governed by the difference between and the transient yield stress that characterizes the stability of configurations visited by the system at strain . Assuming the analyticity of allows us to predict and asymptotic behaviors of in terms of properties of stationary flows. We test successfully our predictions using elastoplastic models and published experimental results.
- Received 17 January 2022
- Revised 11 July 2022
- Accepted 27 September 2022
DOI:https://doi.org/10.1103/PhysRevLett.129.208001
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
Published by the American Physical Society
Physics Subject Headings (PhySH)
synopsis
How Materials Get the Creeps
Published 9 November 2022
Researchers have developed a comprehensive theory of creep flow—a type of flow seen in amorphous solids such as coffee foam.
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