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Alfredo Taboada - One of the best experts on this subject based on the ideXlab platform.
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Comparison of the effects of rolling resistance and Angularity in sheared granular media
2013Co-Authors: Nicolas Estrada, Emilien Azéma, Farhang Radjai, Alfredo TaboadaAbstract:In this paper, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of Angularity in granular systems composed of regular polygonal Particles. For this purpose, we use contact dynamics simulations. By means of a simple shear numerical device, we investigate the mechanical behavior of these materials in the steady state in terms of shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. We find that, based on the energy dissipation associated with relative rotation between two Particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal Particle. This finding supports the use of rolling resistance as a shape parameter accounting for Particle Angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular Particles is the partial hindrance of rotations as a result of Angular Particle shape.
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Identification of rolling resistance as a shape parameter in sheared granular media
Physical Review E : Statistical Nonlinear and Soft Matter Physics, 2011Co-Authors: Nicolas Estrada, Emilien Azéma, Farhang Radjai, Alfredo TaboadaAbstract:Using contact dynamics simulations, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of Angularity in granular systems composed of regular polygonal Particles. In simple shear conditions, we consider four aspects of the mechanical behavior of these systems in the steady state: shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. Our main finding is that, based on the energy dissipation associated with relative rotation between two Particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal Particle. This finding supports the use of rolling resistance as a shape parameter accounting for Particle Angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular Particles is the partial hindrance of rotations as a result of Angular Particle shape.
Nicolas Estrada - One of the best experts on this subject based on the ideXlab platform.
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Comparison of the effects of rolling resistance and Angularity in sheared granular media
2013Co-Authors: Nicolas Estrada, Emilien Azéma, Farhang Radjai, Alfredo TaboadaAbstract:In this paper, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of Angularity in granular systems composed of regular polygonal Particles. For this purpose, we use contact dynamics simulations. By means of a simple shear numerical device, we investigate the mechanical behavior of these materials in the steady state in terms of shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. We find that, based on the energy dissipation associated with relative rotation between two Particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal Particle. This finding supports the use of rolling resistance as a shape parameter accounting for Particle Angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular Particles is the partial hindrance of rotations as a result of Angular Particle shape.
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Identification of rolling resistance as a shape parameter in sheared granular media
Physical Review E : Statistical Nonlinear and Soft Matter Physics, 2011Co-Authors: Nicolas Estrada, Emilien Azéma, Farhang Radjai, Alfredo TaboadaAbstract:Using contact dynamics simulations, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of Angularity in granular systems composed of regular polygonal Particles. In simple shear conditions, we consider four aspects of the mechanical behavior of these systems in the steady state: shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. Our main finding is that, based on the energy dissipation associated with relative rotation between two Particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal Particle. This finding supports the use of rolling resistance as a shape parameter accounting for Particle Angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular Particles is the partial hindrance of rotations as a result of Angular Particle shape.
Emilien Azéma - One of the best experts on this subject based on the ideXlab platform.
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Texture Properties of a-2D Granular Mixture of an Angular Particle under Bi-axial Compression Texture Properties of a-2D Granular Mixture of an Angular Particle under Bi-axial Compression
IOP Conference Series: Materials Science and Engineering, 2020Co-Authors: Theechalit Binaree, Itthichai Preechawuttipong, Emilien AzémaAbstract:Utilizing Discrete Element Modeling (DEM), we investigate the shear strength properties and microstructure of 2D granular mixture composed of various regular polygonal Particles (from triangle to icosagon and disk) under biaxial compression. Three cases were considered: 1) increase of proportion and Angularity started from disk (S1); 2) increase of proportion by decreasing the Angularity started from triangle (S2); 3) increase of proportion by random Angularity started from disk (S3) and polygons (S4). The results show that the shear strength changes with the mean Angularity. On the other hand, the packing fraction slightly varies with the mean Angularity. At the microscopic scale, the granular texture in term of the force, the contacts transmitted the force higher than the average force (strong force) are oriented in the direction of externally applied loading but they represent only 40% of the total number of contacts. Besides, the tangential contact forces direction tend to be consistent with the maximum shear strength direction.
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Comparison of the effects of rolling resistance and Angularity in sheared granular media
2013Co-Authors: Nicolas Estrada, Emilien Azéma, Farhang Radjai, Alfredo TaboadaAbstract:In this paper, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of Angularity in granular systems composed of regular polygonal Particles. For this purpose, we use contact dynamics simulations. By means of a simple shear numerical device, we investigate the mechanical behavior of these materials in the steady state in terms of shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. We find that, based on the energy dissipation associated with relative rotation between two Particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal Particle. This finding supports the use of rolling resistance as a shape parameter accounting for Particle Angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular Particles is the partial hindrance of rotations as a result of Angular Particle shape.
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Identification of rolling resistance as a shape parameter in sheared granular media
Physical Review E : Statistical Nonlinear and Soft Matter Physics, 2011Co-Authors: Nicolas Estrada, Emilien Azéma, Farhang Radjai, Alfredo TaboadaAbstract:Using contact dynamics simulations, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of Angularity in granular systems composed of regular polygonal Particles. In simple shear conditions, we consider four aspects of the mechanical behavior of these systems in the steady state: shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. Our main finding is that, based on the energy dissipation associated with relative rotation between two Particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal Particle. This finding supports the use of rolling resistance as a shape parameter accounting for Particle Angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular Particles is the partial hindrance of rotations as a result of Angular Particle shape.
Giovanniantonio Natale - One of the best experts on this subject based on the ideXlab platform.
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Numerical Evaluation Of A Single Ellipsoid Motion In Newtonian And Power-Law Fluids
2018Co-Authors: Julien Férec, Gilles Ausias, Giovanniantonio NataleAbstract:A computational model is developed for simulating the motion of a single ellipsoid suspended in a Newtonian and power-law fluid, respectively. Based on a finite element method (FEM), the approach consists in seeking solutions for the linear and Angular Particle velocities using a minimization algorithm, such that the net hydrodynamic force and torque acting on the ellipsoid are zero. For a Newtonian fluid subjected to a simple shear flow, the Jeffery's predictions are recovered at any aspect ratios. The motion of a single ellipsoidal fiber is found to be slightly disturbed by the shear-thinning character of the suspending fluid, when compared with the Jeffery's solutions. Surprisingly, the perturbation can be completely neglected for a Particle with a large aspect ratio. Furthermore, the Particle centroid is also found to translate with the same linear velocity as the undisturbed simple shear flow evaluated at Particle centroid. This is confirmed by recent works based on experimental investigations and modeling approach (1-2).
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Numerical evaluation of a single ellipsoid motion in Newtonian and power-law fluids
2018Co-Authors: Julien Férec, Gilles Ausias, Giovanniantonio NataleAbstract:A computational model is developed for simulating the motion of a single ellipsoid suspended in a Newtonian and power-law fluid, respectively. Based on a finite element method (FEM), the approach consists in seeking solutions for the linear and Angular Particle velocities using a minimization algorithm, such that the net hydrodynamic force and torque acting on the ellipsoid are zero. For a Newtonian fluid subjected to a simple shear flow, the Jeffery’s predictions are recovered at any aspect ratios. The motion of a single ellipsoidal fiber is found to be slightly disturbed by the shear-thinning character of the suspending fluid, when compared with the Jeffery’s solutions. Surprisingly, the perturbation can be completely neglected for a Particle with a large aspect ratio. Furthermore, the Particle centroid is also found to translate with the same linear velocity as the undisturbed simple shear flow evaluated at Particle centroid. This is confirmed by recent works based on experimental investigations and modeling approach (1-2).A computational model is developed for simulating the motion of a single ellipsoid suspended in a Newtonian and power-law fluid, respectively. Based on a finite element method (FEM), the approach consists in seeking solutions for the linear and Angular Particle velocities using a minimization algorithm, such that the net hydrodynamic force and torque acting on the ellipsoid are zero. For a Newtonian fluid subjected to a simple shear flow, the Jeffery’s predictions are recovered at any aspect ratios. The motion of a single ellipsoidal fiber is found to be slightly disturbed by the shear-thinning character of the suspending fluid, when compared with the Jeffery’s solutions. Surprisingly, the perturbation can be completely neglected for a Particle with a large aspect ratio. Furthermore, the Particle centroid is also found to translate with the same linear velocity as the undisturbed simple shear flow evaluated at Particle centroid. This is confirmed by recent works based on experimental investigations and mo...
Farhang Radjai - One of the best experts on this subject based on the ideXlab platform.
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Comparison of the effects of rolling resistance and Angularity in sheared granular media
2013Co-Authors: Nicolas Estrada, Emilien Azéma, Farhang Radjai, Alfredo TaboadaAbstract:In this paper, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of Angularity in granular systems composed of regular polygonal Particles. For this purpose, we use contact dynamics simulations. By means of a simple shear numerical device, we investigate the mechanical behavior of these materials in the steady state in terms of shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. We find that, based on the energy dissipation associated with relative rotation between two Particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal Particle. This finding supports the use of rolling resistance as a shape parameter accounting for Particle Angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular Particles is the partial hindrance of rotations as a result of Angular Particle shape.
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Identification of rolling resistance as a shape parameter in sheared granular media
Physical Review E : Statistical Nonlinear and Soft Matter Physics, 2011Co-Authors: Nicolas Estrada, Emilien Azéma, Farhang Radjai, Alfredo TaboadaAbstract:Using contact dynamics simulations, we compare the effect of rolling resistance at the contacts in granular systems composed of disks with the effect of Angularity in granular systems composed of regular polygonal Particles. In simple shear conditions, we consider four aspects of the mechanical behavior of these systems in the steady state: shear strength, solid fraction, force and fabric anisotropies, and probability distribution of contact forces. Our main finding is that, based on the energy dissipation associated with relative rotation between two Particles in contact, the effect of rolling resistance can explicitly be identified with that of the number of sides in a regular polygonal Particle. This finding supports the use of rolling resistance as a shape parameter accounting for Particle Angularity and shows unambiguously that one of the main influencing factors behind the mechanical behavior of granular systems composed of noncircular Particles is the partial hindrance of rotations as a result of Angular Particle shape.
