Impact model for micrometer-sized sand particles

Yu, Kuahai; Tafti, Danesh K.

doi:10.1016/j.powtec.2016.02.014

Cited by 50 publications

(11 citation statements)

References 42 publications

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“…The spectrum of COR values of LBS grains impacting on stainless steel surfaces lies in the same range of values obtained by Yu and Tafti (2016) for quartz sand grains at similar velocities. Similar to CSB and GB, the COR values of LBS were higher and lower when they were impacting on surfaces of granite and rubber blocks, respectively.…”

Section: Coefficient Of Restitution Of Natural Soil Grainssupporting

confidence: 78%

“…From Table 3 and Figure 15, the increasing order of energy loss for LBS grains impacting on various surfaces are granite (37%), stainless steel (53%), brass (69%) and rubber (82%). Compared with GB and CSB, greater degree of scatter in the COR values was observed for fairly regular shaped LBS grains as individual grains can vary in elastic and morphological characteristics (Penumadu et al, 2009, Yu andTafti, 2016). Additionally, the surface roughness and minor irregularities in shape may also have contributed to these higher deviations observed.…”

Section: Coefficient Of Restitution and Energy Lossmentioning

confidence: 98%

“…By contrast, natural geological materials including soil grains and rocks/rock fragments, are not generally homogenous, they have internal flaws and their contacts are of brittle or elasto-plastic to brittle in nature (Cascante and Santamarina, 1996). Yu and Tafti (2016) modelled the collision of micro size sand particles (around 0.1-0.2 mm in diameter) on engineered surfaces of stainless steel and aluminium and found that the COR value decreases with an increase in impact velocity. Durda et al (2011), testing large granite spheres (1m in diameter) impacting each other at a speed on 1m/s, obtained an average value of COR of 0.83.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the coefficient of restitution of grain against block interfaces for natural and engineered materials

et al. 2021

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The coefficient of restitution (COR) is an important input parameter in the numerical simulation of granular flows, as it governs the travel distance, the lateral spreading and the design of barriers. In this study, a new custom-built micro-mechanical impact loading apparatus is presented along with impact experiments on engineered and natural materials. The COR and energy loss of various grains and base block combinations are studied, including fairly regular shaped Leighton Buzzard sand (LBS) grains as a natural soil and granite/rubber as base blocks, apart from the use of engineered materials for the grains (chrome steel balls, glass balls) and blocks (stainless steel, brass). The repeatability of the new micro-mechanical impact loading apparatus was checked by impacting chrome steel balls on stainless steel block. In all the test combinations, the higher and lower values of the COR are found for granite block (ranging between 0.75-0.95) and rubber block (ranging between 0.37-0.44) combinations, respectively. For the tested grain-block combinations, lower values of COR were observed for impacts between materials of low values of composite Young’s modulus.

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Section: Coefficient Of Restitution Of Natural Soil Grainssupporting

confidence: 78%

Section: Coefficient Of Restitution and Energy Lossmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Experimental study on the coefficient of restitution of grain against block interfaces for natural and engineered materials

et al. 2021

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“…10,11 The particle jet is essentially a particular case of the abrasive jets which grind the tools less. 21 In addition, the reason for rock breaking has been studied by many scholars, [22][23][24] and tensile fracture caused by the shock pressure wave of abrasion was the main reason for the rock breaking. [12][13][14][15][16][17] The cutting volume and depth efficiency tend to increase with increasing water pressure and traverse speed and are strongly dependent on the standoff distance.…”

mentioning

confidence: 99%

“…The threshold strain is a function of the impact and rotating velocity and the particle surface contact time. 21 In addition, the reason for rock breaking has been studied by many scholars, [22][23][24] and tensile fracture caused by the shock pressure wave of abrasion was the main reason for the rock breaking. 25,26 According to the high-efficiency rock-breaking characteristics of particle jets and inspired by projectile impact rock breaking, Curlett et al 9 proposed particle impact drilling (PID) technology.…”

mentioning

confidence: 99%

Research on the modulation mechanism and rock breaking efficiency of a cuttings waterjet

Wang

Zhao

et al. 2019

Energy Science & Engineering

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The feasibility of a cuttings waterjet directly modulated in the bottom hole is discussed from the aspects of cuttings suction and rock‐breaking efficiency. The particle waterjet modulation mechanism using a Helmholtz oscillating cavity is studied through numerical simulation and the rock‐breaking efficiency of five types of particles (including cuttings, steel balls, steel emery, garnet, and silicon carbide) is studied through experiment. The influences of particle parameters (such as diameter, density, and concentration) and operation parameters (such as standoff distance, pump pressure, and confining pressure) on the suction and rock‐breaking effect of different particles are analyzed. The results show that all particle types with different parameters could be indrawn into the Helmholtz oscillating cavity with two symmetrical suction ports and could be accelerated to considerable velocity amplitude to impact rock. The rock‐breaking efficiency of pure cuttings was lower than fractional cuttings (ie, 50% cuttings and 50% steel balls) and pure steel balls, but the pure cuttings can be used as an effective assisted rock‐breaking method. The research results lay a foundation for development of a cuttings waterjet directly modulated in the bottom hole for assisting rock‐breaking technology.

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Laboratory and discrete‐based numerical investigation on the collision problem of impactor‐block systems with soft‐porous and hard‐crystalline analog rocks

Luo

Kasyap

et al. 2021

Num Anal Meth Geomechanics

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We investigated experimentally the normal coefficient of restitution (COR) of impactors colliding on the surfaces of two different blocks; a soft‐porous block composed of plaster (dry impacts) and a hard‐crystalline rock composed of granite (dry and wet impacts). The experiments were performed in a range of low‐impact velocities and various particle types were used including perfectly spherical smooth glass beads and ceramic balls, rough glass beads as well as natural rough sand grains. Image processing was carried out to quantify the formed contours of craters caused by the surface damage of the soft blocks due to the impact. The results indicated very low COR values on the plaster block compared with the granite block as the energy was dissipated by means of surface plastic deformations on the plaster, however the contour crater images showed that the collision mechanisms depended on the roughness of the impactor. The behavior of impactor‐fluid‐block systems was dependent on both surface roughness and global morphology of the impactors. Discrete‐based (DEM) numerical simulations were performed to provide further insights into the behavior of the impactor‐block systems subjected to collision using the COR values from the experiments as the micro‐scale parameters and data from the literature as the macro‐scale parameters for the model calibration. The numerical output was used to observe the development of compression and tension force chain networks and how these involved during and after impact on different base blocks.

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Impact model for micrometer-sized sand particles

Cited by 50 publications

References 42 publications

Experimental study on the coefficient of restitution of grain against block interfaces for natural and engineered materials

Experimental study on the coefficient of restitution of grain against block interfaces for natural and engineered materials

Research on the modulation mechanism and rock breaking efficiency of a cuttings waterjet

Laboratory and discrete‐based numerical investigation on the collision problem of impactor‐block systems with soft‐porous and hard‐crystalline analog rocks

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