Cohesion of bird nests

One striking difference between aggregates of flexible frictional fibres and other granular materials like rigid spheres is the effective cohesion of their assembly. While glue or capillary bridges are needed to shape aggregates of spherical particles and build sandcastles, for fibres, no need for g...

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Bibliographic Details
Published in:EPJ Web of conferences 2021-01, Vol.249, p.6014
Main Authors: Andrade-Silva, Ignacio, Godefroy, Théo, Pouliquen, Olivier, Marthelot, Joel
Format: Article
Language:English
Subjects:
Aggregates
Assembly
Cohesion
Fibers
Granular materials
Mechanical properties
X ray microtomography
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Summary:One striking difference between aggregates of flexible frictional fibres and other granular materials like rigid spheres is the effective cohesion of their assembly. While glue or capillary bridges are needed to shape aggregates of spherical particles and build sandcastles, for fibres, no need for glue to build a nest. Here we study an assembly of mono disperse flexible fibres. We first use X-ray microtomography to characterise the geometry of the initial assembly, the number of contact points and mean curvatures of the fibres. Using forcedisplacement measurements, we characterise the macroscopic cohesive strength of the aggregate by varying the geometry of the fibres, the fibres mechanicals properties and the packing of the preparation. Finally, we relate the macroscopic mechanical behaviour of the assembly with the filament reorganisation at the microscopic scale.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/202124906014