An experimental micromechanical study of sand grain contacts behavior from different geological environments

Sandeep, C.S.; He, Huan; Senetakis, Kostas

doi:10.1016/j.enggeo.2018.09.030

Cited by 58 publications

(23 citation statements)

References 58 publications

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“…The grains are relatively smaller in size compared to DNA‐1A, and there are minor abrasions visible on their surfaces which might be due to the sediment transportation (Ghosh et al, ). Similar abrasions were also observed by Sandeep, He, et al () on the surfaces of river sand grains from Guangdong Province, China.…”

Section: Methodssupporting

confidence: 88%

“…The theoretical curve as shown in Figure revealed a wide gap between MD model and the experimental tangential curves for both material types. Previous works (Nardelli et al, ; Sandeep, He, et al, ; Sandeep & Senetakis, , ) reported, similarly, mismatch between MD model and experimental results on a broad range of geological materials, when the MD model is used with its originally proposed power of 1/3 (equation ). They also reported that differences between MD model and experimental curve can be reduced to some extent by considering initial tangential stiffness derived from experiment rather than from equation .…”

Section: Resultsmentioning

confidence: 81%

“…The higher average μ value for Eglin sand (after Nardelli et al, ) compared with Ottawa sand is attributed, predominantly, to the higher roughness values of that material (average S q = 0.59 μm), since Young's moduli are in close proximity between these materials. Testing quartz sand grains from different geological environments, Sandeep, He, et al () showed that the interparticle friction for materials of very similar Young's modulus, depends, predominantly, on the surface roughness.…”

Section: Resultsmentioning

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: Methodssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

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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“…The low surface roughness and the high surface hardness values imply a lower coefficient of friction for the material as the literature data would suggest. 49,54,57 A highly plastic clay, montmorillonite, and a non-plastic silt, composed of crushed aggregates, were used as gouge materials in this study. The montmorillonite was obtained in powder form.…”

Section: Description Of Materialsmentioning

confidence: 99%

“…The intensity of stick-slip instability at lower F N compared to higher F N is shown in Figure 3B in terms of mobilized friction coefficient (μ mob ), defined as the ratio of tangential force to the applied normal force at a given tangential displacement. Based on literature sources, 44,49,54 the coefficient of friction of the smooth quartz plates is smaller (μ ss = 0.10-0.15) compared to that of natural quartz grains (LBS, μ ss = 0.15-0.30), and is in the range of engineered materials such as steel balls (μ ss = 0.09) and glass balls (μ ss = 0.11), which also have smooth surfaces.…”

Section: Frictional Behavior Of Bounding Surfacesmentioning

confidence: 99%

Micromechanical‐based experimental and analytical studies on rate effects and stick‐slip instability of smooth quartz surfaces in the presence of plastic and non‐plastic gouges

Kasyap

Senetakis

2020

Num Anal Meth Geomechanics

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We examined with micromechanical-based experiments the influence of shearing rate on the tangential contact behavior of smooth (very low surface roughness) flat quartz surfaces with montmorillonite and crushed aggregates as gouges. On decreasing the shearing rate by one order of magnitude, significant changes in the stick-slip instability were observed; increase in force-drop, recurrence interval and slip velocity. The initial tangential stiffness increased on decreasing the shearing rate. The type of gouge particles also influenced the behavior of the interfaces; for example, higher friction and stable sliding were observed for angular particles (non-plastic gouge) compared to flaky particles (plastic gouge). The partition of the tangential force-displacement relationship based on the shape of the curve was also dependent on the shearing rate. On a qualitative standpoint, the results presented in this micromechanicalbased study were in agreement with macro-scale test results published in the literature, although different scale tests were also performed in the present work, from grain-level to direct shear test size. The changes in the behavior of stick and slip components of the tangential force and the contact area with shearing rate were analytically studied, and the corresponding variations in the normal load-displacement relationship were also discussed. This experimental micromechanical-based study with additional analytical support, provides a preliminary understanding of the frictional behavior of different gouges under shearing rates of one folder difference and also provides insights into the stickslip instability behavior at a microscopic (grain-scale) standpoint.

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A Micromechanical-Based Investigation on the Frictional Behaviour of Artificially Bonded Analogue Sedimentary Rock with Calcium Carbonate

Ren

Senetakis

2021

Pure Appl. Geophys.

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An experimental micromechanical study of sand grain contacts behavior from different geological environments

Cited by 58 publications

References 58 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

Micromechanical‐based experimental and analytical studies on rate effects and stick‐slip instability of smooth quartz surfaces in the presence of plastic and non‐plastic gouges

A Micromechanical-Based Investigation on the Frictional Behaviour of Artificially Bonded Analogue Sedimentary Rock with Calcium Carbonate

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