Effects of induced anisotropy on the development of shear bands in granular materials

Oda, Masanobu; Kazama, Hidehiko; Konishi, Junichi

doi:10.1016/s0167-6636(97)00018-5

Cited by 63 publications

(22 citation statements)

References 14 publications

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“…This point of behavior coincides with the initiation of columns buckling and the generation of large voids. As mentioned before, these observations agree well with the findings on real sand tests in laboratory [20,21].…”

Section: Observational Investigationssupporting

confidence: 92%

“…They explained that such happening is the reason why large dilatancy can be found after the peak stress [17]. Oda et al [20] compared these results with those of plane strain tests on Ticino and Toyoura sands [21] and they found that the same happenings can take place in real sand samples within narrow shear bands. Accordingly, it is possible to say that the mechanical behavior of granular materials can be well interpreted as a consequence of microscopic events within the assembly.…”

Section: Introductionmentioning

confidence: 90%

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Investigating the micromechanical evolutions within inherently anisotropic granular materials using discrete element method

Hosseininia

2012

Granular Matter

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Section: Observational Investigationssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 90%

Investigating the micromechanical evolutions within inherently anisotropic granular materials using discrete element method

Hosseininia

2012

Granular Matter

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“…A disordered granular material, however, is inherently anisotropic even if isotropic particles (i.e., spheres) are used [25]. Anisotropy underpins the key mechanical and physical properties of granular media (e.g., permeability and thermal conductivity), and the related research has drawn much attention [26,33,46,47]. It is interesting to examine the feature 042208-6 LOCAL FLUCTUATIONS AND SPATIAL CORRELATIONS .…”

Section: Fluctuations Of Anisotropymentioning

confidence: 99%

Local fluctuations and spatial correlations in granular flows under constant-volume quasistatic shear

Guo

Zhao

2014

Phys. Rev. E

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We investigate the local fluctuations in dense granular media subjected to athermal, quasistatic shearing, based on three-dimensional discrete element method simulations. By shearing granular assemblies of different polydispersities under constant-volume constraint, we quantify the characteristics of local structures (in terms of local volume and local anisotropy) and local deformation (using local shear strain and nonaffine displacement). The distribution of the local volume in a granular medium is found unchanged during the entire shearing process, which indicates a constant temperaturelike compactivity for the material. The compactivity is not, however, equilibrated among different particle groups in a polydisperse assembly. The local structures of a disordered granular assembly are inherently anisotropic. The fluctuations in local anisotropy can be well captured by a gamma or mixed-gamma distribution function, which is also unchanged during the shear. The local anisotropic orientation evolves towards the coaxial direction of the stress anisotropy with shear. The deformation characteristics of a jammed granular medium have their origins in the structural amorphousness. The local shear strain field depicts clear shear transformation zones which act as plasticity carriers. The spatial correlation of the local shear strains exhibits a fourfold pattern which is stronger in the stress deviatoric planes than in the stress isotropic plane. The fluctuations of nonaffine displacement suggest an isotropic granular temperature and an isotropic spatial correlation independent of the stress state. Both the local strain and the nonaffine displacement exhibit a power-law decayed distribution with a long-range correlation. We further modify the shear-transformation-zone theory to predict the pressure-dependent constitutive behavior of a sheared granular material and compare its prediction with our simulation data.

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“…The mechanism of shear banding is the instability caused by initial imperfections. A wide range of experimental data on shear bands in granular materials is available in literature (Drescher et al, 1990;Oda et al, 1998;Alshibli and Sture, 2000;Voyiadjis et al, 2005). A study of the localization and instability based on the model presented in this paper will appear in a future work.…”

Section: Introductionmentioning

confidence: 93%

Three-dimensional constitutive relations for granular materials based on the dilatant double shearing mechanism and the concept of fabric

Zhu

Mehrabadi

Massoudi

2006

International Journal of Plasticity

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Effects of induced anisotropy on the development of shear bands in granular materials

Cited by 63 publications

References 14 publications

Investigating the micromechanical evolutions within inherently anisotropic granular materials using discrete element method

Investigating the micromechanical evolutions within inherently anisotropic granular materials using discrete element method

Local fluctuations and spatial correlations in granular flows under constant-volume quasistatic shear

Three-dimensional constitutive relations for granular materials based on the dilatant double shearing mechanism and the concept of fabric

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