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• W2898869554 endingPage "20180642" @default.
• W2898869554 startingPage "20180642" @default.
• W2898869554 abstract "Active networks are omnipresent in nature, from the molecular to the macro-scale. In this study, we explore the mechanical behaviour of fire ant aggregations, closely knit swarms that display impressive dynamics culminating with the aggregations’ capacity to self-heal and adapt to the environment. Although the combined elasticity and rheology of the ant aggregation can be characterized by phenomenological mechanical models (e.g. linear Maxwell or Kelvin–Voigt model), it is not clear how the behaviour of individual ants affects the aggregations’ emerging responses. Here, we explore an alternative way to think about these materials, describing them as a collection of individuals connected via elastic chains that associate and dissociate over time. Using our knowledge of these connections—e.g. their elasticity and attachment/dissociation rates—we construct a statistical description of connection stretch and derive an evolution equation for the corresponding stretch distribution. This time-evolving stretch distribution is then used to determine important macroscopic measures, e.g. stress, energy storage and energy dissipation, in the network. In this context, we show how the physical characteristics and activities of individual ants can explain the elasticity, flow and shear thinning of the aggregation. In particular, we find that experimental results are matched if the detachment rate between two individuals increases with tension in the connection." @default.
• W2898869554 created "2018-11-09" @default.
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• W2898869554 date "2018-10-01" @default.
• W2898869554 modified "2023-10-05" @default.
• W2898869554 title "How do fire ants control the rheology of their aggregations? A statistical mechanics approach" @default.
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• W2898869554 doi "https://doi.org/10.1098/rsif.2018.0642" @default.
• W2898869554 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6228480" @default.
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