Elastic waves in particulate glass-rubber mixture: Experimental and numerical investigations/studies

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Abstract

In this paper we study by wave propagation the elastic response of granular mixtures made of soft and stiff particles subjected under hydrostatic pressure/stress. This allows inferring fundamental properties of granular materials such as elastic moduli and dissipation mechanisms. We compare physical experiments in a triaxial cell equipped with piezoelectric wave transducers and Discrete Element Method simulations (DEM). In the experimental part, dense, static packings made of monodisperse glass and rubber beads are prepared at various levels of hydrostatic stress and species fractions. Small perturbations are generated on one side and the time of flight through the glass-rubber mixtures are measured to quantify the effect of the mixture composition on the elastic moduli. Interestingly, the experiments show that the behavior is non-linear and nonmonotonic with increasing percentage of rubber particles. Wave velocity and modulus remain fairly constant when increasing the fraction of rubber to 30%, while they experience a sudden drop between 30% and 60%, to become again constant between 60% to 100%. DEM simulations offer deeper insights into the micromechanics in and at the transition between the glass- and rubber-dominated regimes. The simplest analysis with Hertzian spherical particles of different stiffness is performed as a preliminary step. The behavior of mixtures with high glass content is very well captured by the simulations, without need of any additional calibration, whereas the complex interaction between rubber and glass leave open questions for further study.

Original languageEnglish
Article number12019
JournalEPJ Web of Conferences
Volume140
DOIs
Publication statusPublished - 30 Jun 2017
Event8th International Conference on Micromechanics on Granular Media, Powders & Grains 2017 - Montpellier, France
Duration: 3 Jul 20177 Jul 2017
Conference number: 8
http://pg2017.org/en/

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rubber
elastic waves
particulates
glass
modulus of elasticity
simulation
micromechanics
granular materials
hydrostatics
hydrostatic pressure
beads
wave propagation
stiffness
transducers
dissipation
perturbation
cells
interactions

Cite this

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title = "Elastic waves in particulate glass-rubber mixture: Experimental and numerical investigations/studies",
abstract = "In this paper we study by wave propagation the elastic response of granular mixtures made of soft and stiff particles subjected under hydrostatic pressure/stress. This allows inferring fundamental properties of granular materials such as elastic moduli and dissipation mechanisms. We compare physical experiments in a triaxial cell equipped with piezoelectric wave transducers and Discrete Element Method simulations (DEM). In the experimental part, dense, static packings made of monodisperse glass and rubber beads are prepared at various levels of hydrostatic stress and species fractions. Small perturbations are generated on one side and the time of flight through the glass-rubber mixtures are measured to quantify the effect of the mixture composition on the elastic moduli. Interestingly, the experiments show that the behavior is non-linear and nonmonotonic with increasing percentage of rubber particles. Wave velocity and modulus remain fairly constant when increasing the fraction of rubber to 30{\%}, while they experience a sudden drop between 30{\%} and 60{\%}, to become again constant between 60{\%} to 100{\%}. DEM simulations offer deeper insights into the micromechanics in and at the transition between the glass- and rubber-dominated regimes. The simplest analysis with Hertzian spherical particles of different stiffness is performed as a preliminary step. The behavior of mixtures with high glass content is very well captured by the simulations, without need of any additional calibration, whereas the complex interaction between rubber and glass leave open questions for further study.",
author = "{Taghizadeh Bajgirani}, Kianoosh and Holger Steeb and Vanessa Magnanimo and Stefan Luding",
year = "2017",
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