2020/02/29 by Jean-Baptiste Thomazo, Eric Lauga, Benjamin Le Révérend +4 · 7 citations
Engineering · Materials Science · Physics and Astronomy · #Advanced Materials and Mechanics #Classical mechanics #Composite material #Condensed matter physics #Deflection (physics) #Materials science #Mechanics #Micro and Nano Robotics #Phenomenological model #Physics #Pickering emulsions and particle stabilization #Shear (geology) #Stiffening #cond-mat.soft
paper · pdf · doi:10.1103/physreve.102.010602
published in Physical review. E 102(1), 010602 (American Physical Society) · 5 pages, 3 figures
arxiv created 2020/05/22 · openalex publication_date 2020/07/02 · arxiv updated 2020/07/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Many living systems use assemblies of soft and slender structures whose deflections allow them to mechanically probe their immediate environment. In this work, we study the collective response of artificial soft hair assemblies to a shear flow by imaging their deflections. At all hair densities, the deflection is found to be proportional to the local shear stress with a proportionality factor that decreases with density. The measured collective stiffening of hairs is modeled both with a microscopic elastohydrodynamic model that takes into account long-range hydrodynamic hair-hair interactions and a phenomenological model that treats the hair assemblies as an effective porous medium. While the microscopic model is in reasonable agreement with the experiments at low hair density, the phenomenological model is found to be predictive across the entire density range.