Effect of initial packing density, stress level and particle size ratio on the behavior of binary granular material: a micromechanical approach

Vahidi-Nia, F.; Bayesteh, Hamed; Khodaparast, Mehdi

doi:10.1007/s10035-020-01036-8

Cited by 14 publications

(14 citation statements)

References 55 publications

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“…The smaller the contact area, the shorter the elastic deformation section in the stress-strain curve and the larger the Poisson's ratio; thus, plastic strain increases. [36][37][38] Accordingly, the strain increases as the particle size increases, which means that the mechanical damage of the electrode increases as the size of the pattern unit decreases (Figure S6, Supporting Information). Considering the particle size of the electrode, the effect of pattern size was tested under three conditions: small, medium, and large circles with diameters of 125, 250, and 500 µm, respectively (Figure S7, Supporting Information).…”

Section: Patterning Process Of the Bilayer Anodementioning

confidence: 99%

Design Strategies toward High‐Performance Hybrid Carbon Bilayer Anode for Improved Ion Transport and Reaction Stability

Kim

et al. 2022

Adv Funct Materials

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Compositing carbon‐based materials with different properties can significantly improve the energy density of lithium‐ion batteries for applications that require high power, such as electric vehicles, owing to their effective current distribution. Nevertheless, the chemical reaction is not uniform throughout the entire depth of conventionally blended electrodes. This study proposes a hybrid patterned bilayer anode that comprises a blended layer of spherical crystalline graphite (SCG) and soft carbon and a single layer of SCG alone, which maintains a stable ionic reaction at the electrode surface and improves ion transport. This bilayer anode has a smaller, more uniform solid electrolyte interphase layer that is more evenly distributed throughout the electrode compared with the blended electrode. The electrode pattern interfaces, which are optimized by controlling the pattern size, ensure excellent mechanical adhesion and low internal resistance. Consequently, the patterned bilayer half‐cell achieves a high‐capacity retention of 85.9% after 500 charge–discharge cycles at 1 C. The full cell also attains an energy density of 178.7 Wh kg−1 with fast discharging at 10 C, which is 2.3 times higher than that of the single‐layer SCG electrode.

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Section: Patterning Process Of the Bilayer Anodementioning

confidence: 99%

Design Strategies toward High‐Performance Hybrid Carbon Bilayer Anode for Improved Ion Transport and Reaction Stability

Kim

et al. 2022

Adv Funct Materials

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“…Previous DEM studies mainly focused on the shear strength of granular materials, The micromechanical evaluation of the effect of 𝛼 and FC on the behavior of binary graded soil was less frequently considered. Recently, Vahidi-Nia et al [41][42] investigated the effect of factors such as α, FC, initial packing density (IPD) and confining pressure (P) on the drained/undrained behavior of binary graded soil from a micro-mechanical perspective. However, the evaluation of e* and estimation of the effect of FC on the performance of binary graded soil have not been addressed in their works.…”

Section: Introductionmentioning

confidence: 99%

“…lists the values of the contact parameters used for simulation in the linear contact model based on the recommendations in the technical literature[41][42][50][51][52].…”

mentioning

confidence: 99%

The role of fines content and particle size ratio on the load-bearing structure of binary granular soil: A micromechanical approach

Nia,

Bayesteh,

Khodaparast

2024

Preprint

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The particle size ratio and fines content are the most important factors influencing the behavior of binary graded granular soil. Previous studies have focused more on the effects of the fabric, particle size distribution and fines content on the macroscopic response of binary mixtures. The effect of the fines participation factor (β) on the load-bearing structure of binary graded soil and estimation of this parameter (β) from the macro and micromechanical perspectives have rarely been evaluated. The present study used a micro-mechanical approach and DEM to evaluate the global void ratio (e), intergranular void ratio (e*) and the contribution of the fines content to the load-bearing structure of binary graded soil during drained and undrained tests. The effects of the particle size ratio, fines content, initial packing density and confining pressure on β also have been evaluated. The results showed that e* is a more reliable parameter than e for interpreting the behavior of binary graded soil. In a binary graded mixture that contains coarse and fine grains, β increased non-linearly and lower values of β were obtained for denser samples. With an increase in the particle size ratio, the values of β and microscopic parameters such as the coarse-fine (C-F) particle contact decreased. The decrease in the C-F particle contact caused a decrease in β. An equation is proposed to estimate β based on the fines content and particle size ratio of the binary mixtures.

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“…Lv et al (2022) and Wang et al (2022) discovered a strong correlation between the particle size and the shear bandwidth of the granular sample. The characterization quantities of the particle size in previous studies are various, such as the maximum particle size (d max ) (Ji et al, 2011;Chaulagai et al, 2017), average particle size (d 50 ) (Giang et al, 2007), and the ratio of the maximum to minimum particle size (d max /d min ) (Ding et al, 2014;Vahidi-Nia et al, 2020). However, there is still a need for discussion regarding the quantitative description of the size effect and the quantitative correlations between the mechanical parameters and the representative characterization quantity.…”

Section: Introductionmentioning

confidence: 99%

A determination method for the shear strength of soil-rock mixture considering the size effect and its application

et al. 2022

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The shear strength of the soil-rock mixture (S-RM) is the primary mechanical factor influencing the stability of the deposit slope. The particle size range inside the test sample, however, is not the same as that of the S-RM in the deposit slope due to the limitations of the test device, which results in a variation in the mechanical properties. In this study, computer simulation tests were conducted to examine the impact of particle size on mechanical behaviors under the uniaxial compressive condition, and the size effect was analyzed from both macroscopic and mesoscopic perspectives. Results indicate that when the particle size increases, the anisotropy levels of the S-RM sample also rise, causing the particle displacement difference inside the sample to increase and the rounding rock effect to become more pronounced. The quantitative relationship between the uniaxial compressive strength (UCS) and the maximum particle size (dmax) was proposed, and the accuracy of the prediction formula for the UCS value of S-RM that takes the size effect into account has been confirmed. The improvement of the shear strength determination method was achieved by unifying the particle size range corresponding to the uniaxial compressive and shear test results used in the approach, and the determination method was used to evaluate the stability of a typical deposit slope. The study results can be used as a guide for estimating strength parameters of S-RM throughout the design and construction process of the deposit slope.

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Effect of initial packing density, stress level and particle size ratio on the behavior of binary granular material: a micromechanical approach

Cited by 14 publications

References 55 publications

Design Strategies toward High‐Performance Hybrid Carbon Bilayer Anode for Improved Ion Transport and Reaction Stability

Design Strategies toward High‐Performance Hybrid Carbon Bilayer Anode for Improved Ion Transport and Reaction Stability

The role of fines content and particle size ratio on the load-bearing structure of binary granular soil: A micromechanical approach

A determination method for the shear strength of soil-rock mixture considering the size effect and its application

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