Stick-slip behaviours of dry glass beads in triaxial compression

Cui, Deshan; Wu, Wei; Xiang, Wei; Doanh, T.; Chen, Qiong; Wang, Shun; Liu, Qingbing; Wang, Jinge

doi:10.1007/s10035-016-0682-5

Cited by 45 publications

(24 citation statements)

References 41 publications

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“…The peak and critical state friction angles obtained are typical and consistent with those reported for glass beads in the literature (e.g. [9,21,31]).…”

Section: Testing Proceduressupporting

confidence: 89%

“…Glass beads were selected for this investigation as their mechanical behaviour has been studied extensively in the literature (e.g. [9,19,21]) and batches of different size fractions could be procured with consistent properties. Four poorly-graded, single-sized glass bead materials were selected to promote stick-slip behaviour during shearing, minimise the influence of different fabrics and to control mineralogy, shape, surface roughness and inter-particle friction.…”

Section: Glass Beadsmentioning

confidence: 99%

“…The AE measurement system filtered frequencies below 10 kHz; however, previous studies have demonstrated high levels of AE at frequencies below 10 kHz during the stress release phase of stick-slip events (e.g. [7,19,21]). Note that the resonant frequency of the transducer was 30 kHz, which was the cause of the peak in AE response around this frequency.…”

Section: Shearingmentioning

confidence: 99%

“…Glass beads are often used in the investigations of granular media behaviour (e.g. [10,12,[19][20][21]) because of their relatively uniform and well understood properties. However, to date, interpretation of AE generated by glass beads has been qualitative (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic emission generated by glass beads in compression and shearing

Smith

Dixon

2019

Granular Matter

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Acoustic emission (AE) monitoring offers the potential to sense particle-scale interactions that lead to macro-scale responses of granular materials. This paper presents results from a programme of drained triaxial tests performed on densely packed glass beads to establish quantitative interpretation of AE during isotropic compression, shearing and associated stick-slip events. Relationships have been quantified between: AE and boundary work (i.e. AE generated per Joule) for a unit volume of glass beads under isotropic compression and shear; AE and shear displacement rate; and the amplitude of deviator stress cycles and AE activity during stick-slip events. In shear, AE generation increased with shear strain and reached peak values that were maintained from volume minimum (i.e. the transition from contractive to dilative behaviour) to peak dilatancy, whereupon AE generation gradually reduced and then remained around a constant mean value with further increments of shear strain. In each stick-slip event, AE activity increased during shear strength mobilisation, particle climbing and dilation, and then reduced with the subsequent deviator stress drop during particle sliding and contraction. The amplitude of these cycles in AE activity were governed by the amplitude of deviator stress cycles during stick-slip events, which were also proportional to the imposed stress level and inversely proportional to particle size.

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“…The peak and critical state friction angles obtained are typical and consistent with those reported for glass beads in the literature (e.g. [9,21,31]).…”

Section: Testing Proceduressupporting

confidence: 89%

Section: Glass Beadsmentioning

confidence: 99%

Section: Shearingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acoustic emission generated by glass beads in compression and shearing

Smith

Dixon

2019

Granular Matter

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“…Granular materials present unique opportunities as model systems for the study of amorphous plasticity because their macroscopic scale allows for direct access to the parameters that govern local stress transmission and redistribution. The idea that particle shape is an important driver in a granular material's plastic behavior has been pursued in simulations [19][20][21], but past experiments have either been limited to two-dimensional systems [10,22,23] or confined to spheres [2,[24][25][26][27] or naturally occurring soils and grains [28][29][30][31]. Our work takes advantage of 3D-printing in order to create parti-FIG.…”

Section: Introductionmentioning

confidence: 99%

Transforming Mesoscale Granular Plasticity Through Particle Shape

2019

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When an amorphous material is strained beyond the point of yielding it enters a state of continual reconfiguration via dissipative, avalanche-like slip events that relieve built-up local stress. However, how the statistics of such events depend on local interactions among the constituent units remains debated. To address this we perform experiments on granular material in which we use particle shape to vary the interactions systematically. Granular material, confined under constant pressure boundary conditions, is uniaxially compressed while stress is measured and internal rearrangements are imaged with x-rays. We introduce volatility, a quantity from economic theory, as a powerful new tool to quantify the magnitude of stress fluctuations, finding systematic, shape-dependent trends. In particular, packings of flatter, more oblate shapes exhibit more catastrophic plastic deformation events and thus higher volatility, while rounder and also prolate shapes produce lower volatility. For all 22 investigated shapes the magnitude s of relaxation events is well-fit by a truncated power law distribution P (s) ∼ s −τ exp(−s/s * ), as has been proposed within the context of plasticity models. The power law exponent τ for all shapes tested clusters around τ = 1.5, within experimental uncertainty covering the range 1.3 -1.7. The shape independence of τ and its compatibility with mean field models indicate that the granularity of the system, but not particle shape, modifies the stress redistribution after a slip event away from that of continuum elasticity. Meanwhile, the characteristic maximum event size s * changes by two orders of magnitude and tracks the shape dependence of volatility. Particle shape in granular materials is therefore a powerful new factor influencing the distance at which an amorphous system operates from scale-free criticality. These experimental results are not captured by current models and suggest a need to reexamine the mechanisms driving mesoscale plastic deformation in amorphous systems. arXiv:1808.06271v3 [cond-mat.soft]

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CPFD simulation on angle of repose with hopper geometries and particle properties

et al. 2022

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The dynamic angle of repose was simulated by computational particle fluid dynamics (CPFD) when particles were continuously falling. CPFD simulation variables were fitted by comparing the angle of repose with the experimental data and P s (particle normal stress) variance. Using a fitted simulation, the effect of hopper height (H h ) and hopper inlet diameter (D in ) on the angle of repose was investigated. As H h increased, the angle of repose decreased up to the height at which the particle velocity reached terminal velocity. Also, as D in /D hopper decreased, the descending area of the particle was increased, following an increase in the angle of repose from 11 to 53 . The design of a hopper based on the obtained results shows that the particle discharge rate of the hopper can be increased by about 2.5 times.

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Stick-slip behaviours of dry glass beads in triaxial compression

Cited by 45 publications

References 41 publications

Acoustic emission generated by glass beads in compression and shearing

Acoustic emission generated by glass beads in compression and shearing

Transforming Mesoscale Granular Plasticity Through Particle Shape

CPFD simulation on angle of repose with hopper geometries and particle properties

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