Grain-scale mechanics of quartz sand under normal and tangential loading

Sandeep, C.S.; Senetakis, Kostas

doi:10.1016/j.triboint.2017.09.014

Cited by 87 publications

(62 citation statements)

References 23 publications

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“…From the highlighted part of Figure a, it was observed that both materials showed some plastic response in the initial regime of the curves, on the order of 0.2 to 0.8 μm for Ottawa sand and 1.1 to 5.1 μm for DNA‐1A. For the Ottawa sand, this observed range of initial plastic displacements is very similar with previously reported data on Eglin sand by Nardelli et al () and LBS by Sandeep and Senetakis (, ). For the regolith simulant, the extended regime of initial plastic displacements is similar with the reported data on decomposed granite grains by Sandeep and Senetakis () and Nardelli and Coop ().…”

Section: Resultssupporting

confidence: 88%

“…The higher values of surface roughness and the brittle nature of the microasperities of the DNA‐1A grains might have contributed to the observed trends. Based on the results from this study and from previous works by the authors (Sandeep & Senetakis, , ) on other geological materials, the initial regime of plastic displacements qualitatively depends on surface roughness. However, a clear quantitative correlation was not observed for the tested materials between magnitude of initial plastic displacements and surface roughness.…”

Section: Resultssupporting

confidence: 66%

“…Previous works (Balevicius & Mroz, ; Cavarretta et al, ; Nardelli et al, ; Nardelli & Coop, ; Sandeep & Senetakis, , ) showed that the theoretical curves plotted using the Hertz model fit the experimental data reasonably well apart from an initial regime where the behavior is elastic‐plastic to plastic for rough surface morphologies.…”

Section: Contact Mechanics Modelsmentioning

confidence: 78%

“…Representative energy‐dispersive X‐ray spectroscopy spectrum results of DNA‐1A and Ottawa sand grains are presented in Figure . The chemical composition of DNA‐1 presented by Cesaretti et al () and Leighton Buzzard sand (LBS) presented by Sandeep and Senetakis () are also summarized in Table for comparison purposes. Based on the chemical analysis from Table 1 and Figure , it can be concluded that the composition of DNA‐1A is very similar to that reported by Marzulli and Cafaro ().…”

Section: Methodsmentioning

confidence: 99%

“…The parameters obtained through micromechanical tests at the grain scale (for example, interparticle friction, normal and tangential stiffness) comprise important input in numerical simulations using DEM analyses, for example, in the analysis of the macroscale response of granular materials subjected to monotonic or cyclic loading and the flowability behavior of granular materials (Huang et al, ; Iverson et al, ; Sazzad & Suzuki, ; Yan et al, ). Based on this, significant advancements took place in recent years in microscale experimentation investigating the contact behavior of geological materials and lunar regolith simulants (e.g., Cavarretta et al, ; Cole, ; Cole & Peters, ; Nardelli et al, ; Nardelli & Coop, ; Sandeep & Senetakis, , , ; Senetakis et al, , ; Senetakis & Coop, ). It is highlighted, based on the studies by Sandeep and Senetakis (, ), that the mesoscale morphology of the grains and the previous loading history affect, markedly, the interparticle load‐displacement relationship and coefficient of friction.…”

Section: Introductionmentioning

confidence: 99%

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Micromechanical Behavior of DNA‐1A Lunar Regolith Simulant in Comparison to Ottawa Sand

et al. 2019

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In this study, the micromechanical interparticle contact behavior of “De NoArtri” (DNA‐1A) grains is investigated, which is a lunar regolith simulant, using a custom‐built micromechanical loading apparatus, and the results on the DNA‐1A are compared with Ottawa sand which is a standard quartz soil. Material characterization is performed through several techniques. Based on microhardness intender and surface profiler analyses, it was found that the DNA‐1A grains had lower values of hardness and higher values of surface roughness compared to Ottawa sand grains. In normal contact micromechanical tests, the results showed that the DNA‐1A had softer behavior compared with Ottawa sand grains and that cumulative plastic displacements were observed for the DNA‐1A simulant during cyclic compression, whereas for Ottawa sand grains elastic displacements were dominant in the cyclic sequences. In tangential contact micromechanical tests, it was shown that the interparticle friction values of DNA‐1A were much greater than that of Ottawa sand grains, which was attributed to the softer contact response and greater roughness of the DNA‐1A grains. Widely used theoretical models both in normal and tangential directions were fitted to the experimental data to obtain representative parameters, which can be useful as input in numerical analyses which use the discrete element method.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 66%

Section: Contact Mechanics Modelsmentioning

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromechanical Behavior of DNA‐1A Lunar Regolith Simulant in Comparison to Ottawa Sand

et al. 2019

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Lower bound analysis of modified pseudo‐dynamic lateral earth pressures for retaining wall‐backfill system with depth‐varying damping using FEM‐Second order cone programming

Fathipour

Payan

Chenari

et al. 2021

Num Anal Meth Geomechanics

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Realistic constitutive ground models are critical in the evaluation of soilstructure interaction problems and the assessment of key design parameters in the seismic analysis of infrastructure systems. In the present study, the modified pseudo-dynamic lateral earth pressures acting on retaining structure with granular backfill of depth-varying damping ratio are evaluated adopting the lower bound limit analysis in conjunction with the finite element (FE) discretization method using second-order cone programming (SOCP). The earthquake loading is simulated by the propagation of shear and primary waves through nonconstant inertia forces in the horizontal and vertical directions, respectively. The influence of varying damping ratio alongside the retaining wall height on the seismic active and passive lateral earth pressures is effectively taken into account by adopting well-established formulas published in the literature. It is shown that failing to consider the damping variation with depth while performing the modified pseudo-dynamic analysis could lead to precarious, unrealistic estimates of design parameters. K E Y W O R D Sfinite element limit analysis (FELA), lateral earth pressure, lower bound, material damping, modified pseudo-dynamic method, second-order cone programming (SOCP)

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Influence of small particle surface asperities on macro and micro mechanical behavior of granular material

Pan

Zhang

Wang

2022

Num Anal Meth Geomechanics

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The shape of particles can have a great impact on the mechanical behavior of granular material, which is not only limited to general shape measures such as sphericity and roundness, but also applies for small scale measures such as surface asperities. In this study, triaxial tests on 3D printed particles and DEM tests show that small surface asperities on spherical particles can contribute significantly to the peak strength and dilatancy of granular material, which cannot be reflected by simply altering the traditional contact parameters in DEM. Using polydispersed particles with artificially designed surface asperities in the form of bumps for laboratory and DEM triaxial tests, both macro and micro scale behavior of granular material are analyzed to reveal the influence of these small surface asperities. The result shows that surface asperities can change the coordination number, anisotropy, and normal contact force on the micro scale, increasing the interlocking between particles and restricting particle rotation, which leads to the increase of peak strength and dilatancy on the macro scale. Although the commonly adopted approach of introducing rolling resistance to reflect shape influence can help to enhance the simulation of stress‐strain relationship, especially for particles with relatively small artificial asperities, the micro scale influence of rolling resistance and surface asperities are found to be different as the size of the asperities increase.

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Grain-scale mechanics of quartz sand under normal and tangential loading

Cited by 87 publications

References 23 publications

Micromechanical Behavior of DNA‐1A Lunar Regolith Simulant in Comparison to Ottawa Sand

Micromechanical Behavior of DNA‐1A Lunar Regolith Simulant in Comparison to Ottawa Sand

Lower bound analysis of modified pseudo‐dynamic lateral earth pressures for retaining wall‐backfill system with depth‐varying damping using FEM‐Second order cone programming

Influence of small particle surface asperities on macro and micro mechanical behavior of granular material

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