Distinct Element Modeling of Rock Cutting under Hydrostatic Pressure

Lei, Shuting; Kaitkay, Prasad

doi:10.4028/www.scientific.net/kem.250.110

Cited by 23 publications

(10 citation statements)

References 12 publications

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“…Molecular dynamics based DEM simulations of indentation and cutting processes at the nanoscale were first reported in [7,8]. The feasibility of using the DEM to investigate the rock cutting process was explored in [9][10][11][12][13][14][15][16][17]. In particular, the DEM was applied to study the effect of wear of the cutter [11] and the link between the cutting force frequencies and the sizes of the produced chips [15].…”

Section: Introductionmentioning

confidence: 99%

Discrete element modeling of tool‐rock interaction I: rock cutting

Huang

Lecampion

Detournay

2012

Num Anal Meth Geomechanics

211

111

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SUMMARYTool‐rock interaction processes can be classified as indentation or cutting depending on the direction of motion of the tool with respect to the rock surface. The modes of failure induced in the rock by an indenting or a cutting tool can be ductile and/or brittle. The ductile mode is associated with the development of a damage zone, whereas the brittle mode involves the growth of macrocracks. This is the first part of a series of two papers concerned with an analysis of the cutting and the indentation processes based on using the discrete element method. In this paper, numerical simulations of the cutting process are conducted to reproduce the transition from a ductile to a brittle failure mode with increasing depth of cut, which is observed in experiments. The numerical results provide evidence that the critical depth of cut d * controlling the failure mode transition is related to the characteristic length ℓ = (KIc ∕ σc)2 with KIc denoting the material toughness and σc its unconfined compressive strength. The nature of frictional contact between the cutter face and the rock in the ductile failure mode is also examined. It is shown that the inclination of the total cutting force is controlled by a multi‐directional flow mechanism ahead of the cutter that is related to the formation of a wedge of failed material, intermittently adhering to the cutter. As a result, the inclination of the total cutting force varies with the rake angle of the cutter and cannot be considered an intrinsic measure of the interfacial friction between the cutter and the rock. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Discrete element modeling of tool‐rock interaction I: rock cutting

Huang

Lecampion

Detournay

2012

Num Anal Meth Geomechanics

211

111

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“…Using a single tooth to cut rock can reflect the local rockbreaking behavior of the drilling bit to a certain extent. There have been some investigations into single-tooth cutting (Lei and Kaitkay 2003;Su and Akcin 2011;Yadav et al 2018;Zhu and Jia 2013), and some conclusions have been drawn. Therefore, the use of a single tooth instead of an integral drilling bit simplifies the problem to a large extent, but it is still possible to draw relatively accurate conclusions.…”

Section: Introductionmentioning

confidence: 99%

The rock breaking and ROP increase mechanisms for single-tooth torsional impact cutting using DEM

2019

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Torsional impact drilling is a new technology which has the advantages of high rock-breaking efficiency and a high rate of penetration (ROP). So far, there is no in-depth understanding of the rock-breaking mechanism for the ROP increase from torsional impact tools. Therefore, it has practical engineering significance to study the rock-breaking mechanism of torsional impact. In this paper, discrete element method (DEM) software (PFC2D) is used to compare granite breaking under the steady and torsional impacting conditions. Meanwhile, the energy consumption to break rock, microscopic crushing process and chip characteristics as well as the relationship among these three factors for granite under different impacting frequencies and amplitudes are discussed. It is found that the average cutting force is smaller in the case of torsional impact cutting (TIC) than that in the case of steady loading. The mechanical specific energy (MSE) and the ratio of brittle energy consumption to total energy are negatively correlated; rock-breaking efficiency is related to the mode of action between the cutting tooth and rock. Furthermore, the ROP increase mechanism of torsional impact drilling technology is that the ratio of brittle energy consumption under the TIC condition is larger than that under a steady load; the degree of repeated fragmentation of rock chips under the TIC condition is lower than that under the steady load, and the TIC load promotes the formation of a transverse cracking network near the free surface and inhibits the formation of a deep longitudinal cracking network.

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“…ey pointed out that there are close correlation between experimental and theoretical researches. Huang et al [14] and Lei and Kaitkay [15] used PFC (2D) to simulate the rock cutting process in two dimensions, and the failure mode and hydrostatic pressure were created to research the rock failure performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Rock Plate Cutting with Three Sides Fixed and One Side Free

Wan

Zeng

et al. 2018

Advances in Materials Science and Engineering

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In order to overcome conical pick wear in the traditional rock cutting method, a new cutting method was proposed on account of increasing free surface of the rock. The mechanical model of rock plate bending under concentrated force was established, and the first fracture position was given. The comparison between experimental and numerical results indicated that the numerical method is effective. A computer code LS-DYNA (3D) was employed to study the cutting performance of a conical pick. To study the rock size influenced on the cutting performance, the numerical simulations with different thickness, width, and height of a rock plate was carried out. The numerical simulation with the different cutting parameters of cutting speed, cutting angle, and cutting position influenced on cutting performance was also carried out. The numerical results indicated that the peak force increased with the increasing thickness of rock plate. With the increasing width and height of the rock plate, the peak force decreased and then became stable. Besides, the peak force decreased with the increasing of cutting position lxp/lx. Moreover, the peak force increased and then decreased with the increasing of cutting angle. The cutting speed has nonsignificant influence on the peak force. The strong exponential relationship was obtained between the peak force and cutting position, thickness, height, and width of the rock plate at a confidence level of 0.95. A binomial relationship was observed between the peak force and cutting angel. The cutting force comparison between traditional rock cutting and rock plate cutting indicated that the new cutting method can effectively reduce peak cutting force.

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Distinct Element Modeling of Rock Cutting under Hydrostatic Pressure

Cited by 23 publications

References 12 publications

Discrete element modeling of tool‐rock interaction I: rock cutting

Discrete element modeling of tool‐rock interaction I: rock cutting

The rock breaking and ROP increase mechanisms for single-tooth torsional impact cutting using DEM

Numerical Simulation of Rock Plate Cutting with Three Sides Fixed and One Side Free

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