Foam rheology at large deformation

Géminard, Jean‐Christophe; Pastenes, Javier Contreras; Melo, Francisco

doi:10.1103/physreve.97.042601

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…This stress-displacement relation has been verified with foam under cycle loading [23]. In granular media, an exponential relaxation of the stress has also been reported [24] but with a characteristic deformation that is much larger than the prediction, σ 0 /G, if we estimate G with Walton's formula [25].…”

Section: Modelsupporting

confidence: 70%

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Propulsion by reciprocal motion into granular media

2021

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The force experienced by an object moving in a granular medium is a necessary input to describe locomotion problems in such a context. Towards this objective, resistive force theory (RFT) has been developed for granular flows inspired by previous developments in the case of viscous flows. In viscous fluids, a reciprocal motion does not lead to a net propulsion due to the kinematics reversibility of viscous flows that is included in the RFT. We show that, in a granular medium, a reciprocal motion allows for propulsion. We investigate the specific mechanisms underlying this propulsion and discuss how they differ from that of viscous flows. Understanding these phenomena permit both the accurate description of locomotion in sand and the refinement of the RFT for granular materials. These achievements provide opportunities towards the development of robots that are able to progress inside granular media and are suitable for controlling industrial processes.

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Section: Modelsupporting

confidence: 70%

“…The plastic process activates above a yield stress, σ Y , and the shear stress saturates to the maximum value, σ 0 , that the material can sustain. The simplest functional form for the elementary plastic deformation is dv = (σ − σ Y )/σ 0 du [23]. Combining these equations, we get…”

Section: Modelmentioning

confidence: 99%

Propulsion by reciprocal motion into granular media

2021

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“… 1 − 3 Géminard et al evaluated the mechanical response of foams to large-amplitude shear. 4 During the reciprocating motion, a limit cycle where the sign of stress was reversed between the outward and homeward directions was observed. The maximum stress became constant when the maximum strain was exceeded: the bubbles deform and rearrange when foams are sheared with large amplitude.…”

Section: Introductionmentioning

confidence: 99%

“…They have both solid- and liquid-like mechanical properties. Although the dispersion of bubbles in the liquid phase can raise the viscosity of the fluid and give it solid-like mechanical properties, foams flow like a liquid when a certain strain is applied: when the strain applied to the foam reaches the yield value, the storage modulus G ′ decreases and the loss modulus G ″ increases. − Géminard et al evaluated the mechanical response of foams to large-amplitude shear . During the reciprocating motion, a limit cycle where the sign of stress was reversed between the outward and homeward directions was observed.…”

Section: Introductionmentioning

confidence: 99%

Friction Dynamics of Foams under Nonlinear Motion

et al. 2022

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Foams are viscoelastic soft materials with complex mechanical properties. Here, we evaluated the friction dynamics of foams between acrylic plates using a sinusoidal motion friction evaluation system and we found some interesting characteristics under accelerated conditions. On a typical solid surface, a symmetrical friction profile, in which static and kinetic frictions are observed, is obtained under reciprocating nonlinear motion. Meanwhile, significant lubricant effects and velocity-dependent friction profiles without static friction were observed in foams. The friction force in foams increased in proportion to the power of velocity, with a power index of <1. These characteristic and dynamic phenomena in foams were observed in this study. They had been caused by the formation of a thick lubricant film and various dissipative modes including surfactant diffusion, viscous dissipation, and wall slip of bubbles. Moreover, the addition of a thickener increased the friction force and the delay time of friction response and improved the foam durability against normal force and shear. These findings are useful for understanding dynamic phenomena in soft materials.

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“…Above a yield value, plastic rearrangements (called T1 events) occur, conferring to these systems a complex rheological behavior [1]. The relationship between the macroscopic response and the microscopic details, such as packing fraction and structural disorder, is still the subject of intense research activity [2][3][4]. Even the simplest case of quasistatic-regime -in which the structure is at mechanical equilibrium at every time -is far from being fully understood, in particular in the shear banding phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Quasistatic rheology of soft cellular systems using Cellular Potts Model

Villemot,

Durand

2021

Preprint

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Soft cellular systems, such as foams or biological tissues, exhibit highly complex rheological properties, even in the quasistatic regime, that numerical modeling can help to apprehend. We present a numerical implementation of quasistatic strain within the widely used cellular Potts model. The accuracy of the method is tested by simulating the quasistatic strain 2D dry foams, both ordered and disordered. The implementation of quasistatic strain in CPM allows the investigation of sophisticated interplays between stress-strain relationship and structural changes that take place in cellular systems.

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Foam rheology at large deformation

Cited by 6 publications

References 27 publications

Propulsion by reciprocal motion into granular media

Propulsion by reciprocal motion into granular media

Friction Dynamics of Foams under Nonlinear Motion

Quasistatic rheology of soft cellular systems using Cellular Potts Model

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