Evolution of grain contacts in a granular sample under creep and stress relaxation

Miksic, Amandine; Alava, Mikko J.

doi:10.1103/physreve.88.032207

Cited by 13 publications

(8 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Simple uniaxial compression followed by a hold without any additional steps of (de)compression, leads to stress relaxation of the granular material that is approximately logarithmic in time ( Fig. 1c), in agreement with past results [7,8]. This logarithmic relaxation suggests that granular materials might belong in the company of systems able to exhibit also nonmonotonic relaxation after an appropriate driving protocol, as seen previously for crumpled paper [4] or the frictional interface between two blocks of PMMA [6].…”

supporting

confidence: 90%

Memory in Nonmonotonic Stress Relaxation of a Granular System

2020

View full text Add to dashboard Cite

We demonstrate experimentally that a granular packing of glass spheres is capable of storing memory of multiple strain states in the dynamic process of stress relaxation. Modeling the system as a non-interacting population of relaxing elements, we find that the functional form of the predicted relaxation requires a quantitative correction which grows in severity with each additional memory and is suggestive of interactions between elements. Our findings have implications for the broad class of soft matter systems that display memory and anomalous relaxation.

show abstract

supporting

confidence: 90%

Memory in Nonmonotonic Stress Relaxation of a Granular System

2020

View full text Add to dashboard Cite

show abstract

“…Different concepts of granular temperatures have been considered in several contexts 14 15 16 17 18 . Moreover, granular elasticity inevitably relaxes into more stable states due to its metastable nature, although the process of relaxation is extremely slow under small mechanical agitations, as has been observed in acoustic measurements 19 . Accordingly, elastic relaxation may be a powerful means of understanding the nature of solid- and fluid-like transitions in granular materials.…”

mentioning

confidence: 89%

On granular elasticity

Sun

Feng

Wang

et al. 2015

Sci Rep

View full text Add to dashboard Cite

Mesoscopic structures form in dense granular materials due to the self-organisation of the constituent particles. These structures have internal structural degrees of freedom in addition to the translational degree of freedom. The resultant granular elasticity, which exhibits intrinsic variations and inevitable relaxation, is a key quantity that accounts for macroscopic solid- or fluid-like properties and the transitions between them. In this work, we propose a potential energy landscape (PEL) with local stable basins and low elastic energy barriers to analyse the nature of granular elasticity. A function for the elastic energy density is proposed for stable states and is further calibrated with ultrasonic measurements. Fluctuations in the elastic energy due to the evolution of internal structures are proposed to describe a so-called configuration temperature Tc as a counterpart of the classical kinetic granular temperature Tk that is attributed to the translational degrees of freedom. The two granular temperatures are chosen as the state variables, and a fundamental equation is established to develop non-equilibrium thermodynamics for granular materials. Due to the relatively low elastic energy barrier in the PEL, granular elasticity relaxes more under common mechanical loadings, and a simple model based on mean-field theory is developed to account for this behaviour.

show abstract

“…These suggest that a continuous relative rearrangement of the individual particles occurs towards a more stable structure configuration (Delage et al 1990, Schmertmann, 1991, Di Prisco and Imposimato, 1996, Bowman and Soga, 2003, Miksic and Alava, 2013. The particle rearrangement mechanism, although of unknown origin, should be bounded by the accessible geometrical constraints of the system and thus is relatively limited -as also observed in experiments.…”

Section: Introductionmentioning

confidence: 91%

Elasto-plastic model for sand including time effect

Cazacliu¹,

Ibraim

2016

Géotechnique Letters

View full text Add to dashboard Cite

Abstract. Time effects on granular soils have been observed in laboratory and in situ tests but cannot be reproduced by classical elasto-plastic models. To address these concerns, existing specific modelling approaches were based on the theory of viscoplasticity formulated by Perzyna or on a viscous evanescent relationship. The present work explores an alternative following an elasto-plastic modelling framework formulated in a multi-axial structure space. The proposed elasto-plastic model is associated with a thixotropic-type framework through the use of a structure parameter, the evolution of which illustrates the competition between two effects: the time-dependent tendency of the granular system to reach its stable configurationrestructuration -and its destructuration under external perturbations. The structure parameter is linked to the existence of a stress dependent target structure towards which the current granular material structure evolves. The time scale is explicitly introduced by postulating a rate for this structure evolution. The modelling of the material behaviour has shown good similarities with the response of granular soils observed in monotonic loading, as well as during creep and variable strain rate loading experiments.

show abstract

Evolution of grain contacts in a granular sample under creep and stress relaxation

Cited by 13 publications

References 32 publications

Memory in Nonmonotonic Stress Relaxation of a Granular System

Memory in Nonmonotonic Stress Relaxation of a Granular System

On granular elasticity

Elasto-plastic model for sand including time effect

Contact Info

Product

Resources

About