Cutting and Slicing Weak Solids - Laboratoire de Mécanique et Génie Civil Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2020

Cutting and Slicing Weak Solids

Résumé

Dicing soft solids with a sharp knife is quicker and smoother if the blade is sliding rapidly parallel to its edge in addition to the normal squeezing motion. We explain this common observation with a consistent theory suited for soft gels and departing from the standard theories of elastic fracture mechanics relied on for a century. The gel is assumed to fail locally when submitted to stresses exceeding a threshold σ 1. The changes in its structure generate a liquid layer coating the blade and transmitting the stress through viscous forces. The driving parameters are the ratio U=W of the normal to the tangential velocity of the blade, and the characteristic length ηW=σ 1 , with η the viscosity of the liquid layer. The existence of a maximal value of U=W for a steady regime explains the crucial role of the tangential velocity for slicing biological and other soft materials.
Fichier principal
Vignette du fichier
Mora_Pomeau_PRL_2020.pdf (361.55 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02925886 , version 1 (31-08-2020)

Identifiants

Citer

Serge Mora, Yves Pomeau. Cutting and Slicing Weak Solids. Physical Review Letters, 2020, 125 (3), ⟨10.1103/PhysRevLett.125.038002⟩. ⟨hal-02925886⟩
45 Consultations
163 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More