Evolution of meso-structures and mechanical properties of granular materials under triaxial compression state from complex network perspective

Jiang, Xiaoqiong; Liu, Enlong; Lian, Jing; Tian, Jianqiu; Sun, Yi

doi:10.1007/s10035-018-0827-9

Cited by 14 publications

(5 citation statements)

References 42 publications

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“…In the 2D granular assembly, the meso loop enclosed by a set of particles was commonly considered as the basic structure element to analyze the rearrangement of particles and local characters during the loading and at the critical state. [38][39][40] The evolutions of meso-characters of granular materials during the shearing toward the critical state were presented in many investigations [41][42][43][44][45][46][47][48] to account for the macro dilatancy, anisotropy and mechanical properties of critical state. For example, Zhu 46,47 described the evolution of quantitative proportion and volume ratio for different loops to analyze the dilatancy of granular materials, and Liu 48 suggested that the macro volume changing during loading is the consequence of mutual transformation for higher-order loops and lower-order loops which reaches a dynamic equilibrium at critical state.…”

Section: Introductionmentioning

confidence: 99%

Upscaling critical state considering the distribution of meso‐structures in granular materials

Wang

Liu

2021

Num Anal Meth Geomechanics

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The evolutions of meso structures of granular materials play important roles during shearing toward the critical state. This study aims to establish an extended analytical model based on a specific upscaling procedure considering the distributions of meso structures in granular materials. A general Gaussian distribution is applied when determining the relationship between meso critical state parameters and order n, and then a quantitative model of macro CSL is developed by taking the discrete case into a continuous function. The quantitative model is then related to interparticle friction μ and contact stiffness k for predicting the macro CSLs for ideal granular assemblies, and the analytical results have good agreement with DEM results. Furthermore, the influence patterns of contact properties on both meso and macro critical states are discussed in detail, which provides a roughly explanation on the variations of critical friction angle with μ.

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Section: Introductionmentioning

confidence: 99%

Upscaling critical state considering the distribution of meso‐structures in granular materials

Wang

Liu

2021

Num Anal Meth Geomechanics

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“…The coordination number is also one of the important meso-structural parameters, which would be used to characterize the compactness of the accumulated particles like porosity. The coordination number is defined as the number of particles in contact with a certain particle, and the coordination number is inversely proportional to the porosity [40]. The coordination number of the traditional ball model is 3.67 and that of the improved multi-element model is 4.66, which indicates that the improved multi-element model could effectively increase the coordination number of the particle assemble.…”

Section: Porosity and Coordination Numbermentioning

confidence: 99%

Macroscopic and microscopic simulation of silo granular flow based on improved multi-element model

Feng¹,

Yuan²

2019

J. vibroeng.

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In the PFC simulation of silo granular discharge, spherical particles were used in the traditional model, which could not accurately reflect macroscopic and mesoscopic mechanism during discharge of wheat, rice and other particles with non-spherical shapes. This research provides an improved multi-element model consisting of clump elements and ball elements. The model uses clump elements to simulate non-spherical grain particles and ball elements to simulate dust particles. The numerical simulation was carried out with the improved multi-element model, and the results are compared with the traditional simulation which uses the spherical ball elements and the experiment of grain discharge. It demonstrates that: (1) In terms of the normal wall pressure, the dynamic pressure fluctuation in flow with improved multi-element model is more gradual, and the discharge process lasts longer, the normal pressure simulation results are more accurate than the traditional model. (2) In terms of the meso-structure of the granular material, compared with traditional spherical ball model, the material packing porosity of the improved multi-element model decreases and the coordination number increases, which is denser and in consistent with the actual situation. (3) Particle shape would affect the meso-mechanical behavior of particles. The simulation results demonstrate that, compared with the traditional spherical ball model, the contact forces in the improved multi-element model increases, and the distribution of contact force chains is more uniform and denser; several arching force chains could be clearly seen in the improved multi-element model, which clearly reflects the dynamic change law of the instantaneous arch. The improved multi-element model established in this paper further improves the accuracy of simulation and reflects the dynamic changes of the normal pressure on the silo wall, granular material structure and meso-mechanical parameters during grain discharge.

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“…Understanding the micromechanical behavior of granular media, especially the microstructure mechanism, will promote our comprehensive understanding of the mechanics of granular materials. Jiang et al [2] and Tian et al [3] linked the evolution of the mesostructure with the macromechanical response of granular materials, which can give us some inspiration. It will be carried out in this research considering the evolution of fabrics and complex force chain networks from a microscopic perspective.…”

Section: Introductionmentioning

confidence: 99%

The Material Deformation and Internal Structure Development of Granular Materials under Different Cyclic Loadings

Wang¹,

Chu²,

Wang³

2022

Computer Modeling in Engineering &Amp; Sciences

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Common structures in engineering such as slopes, roadbeds, ballasts, etc., are closely related to granular materials. They are usually subjected to long-term cyclic loads. This study mainly focused on the mechanical behaviors of randomly arranged granular materials before they reach a stable state under different cyclic loads. The variation of the maximum axial strain and the influence of CSR (cyclic stress ratio) were analyzed. The energy consumed in each cycle under constant confining stress loading condition is significantly greater than that of the fixed wall loading condition. The internal deformation evolution of granular materials is studied in detail. The deformation mode of granular material under cyclic loading at different positions inside the material is different according to the strain variation. In addition, the strain, force chain structure and contact force magnitude are combined to explore their effects on local deformation of granular materials under cyclic loading. From the perspective of the deformation form, the material sample can be divided into several regions, and the ability to adjust particle positions determines the deformation mode of different regions. The changes of local strain with the cyclic loading also reflect the contribution of particle displacements to the evolution of microstructure. This research will provide insights into the understanding of granular materials behaviors under cyclic loading.

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Evolution of meso-structures and mechanical properties of granular materials under triaxial compression state from complex network perspective

Cited by 14 publications

References 42 publications

Upscaling critical state considering the distribution of meso‐structures in granular materials

Upscaling critical state considering the distribution of meso‐structures in granular materials

Macroscopic and microscopic simulation of silo granular flow based on improved multi-element model

The Material Deformation and Internal Structure Development of Granular Materials under Different Cyclic Loadings

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