Numerical Studies on Bit-Rock Fragmentation Mechanisms

Liu, Hongyuan; Kou, Shaoquan; Lindqvist, Per-Arne

doi:10.1061/(asce)1532-3641(2008)8:1(45)

Cited by 62 publications

(45 citation statements)

References 32 publications

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“…Cracks were randomly distributed because the rock is modeled as a homogeneous material; therefore, there was no preferential direction of crack propagation. As shown in Figure 4(b), the cracks propagated outward by tensile stress along with increasing displacement of the conical pick in the -direction [26]. Around the cutting pick, some rock elements failed due to shear stress and compressive stress.…”

Section: Numerical Results and Discussionmentioning

confidence: 96%

“…Both 2D and 3D FEM are widely used to solve 2D and 3D dimensional problems. In the field of rock mechanics, various numerical simulation codes, such as LS-DYNA [3,4,12,13,[15][16][17][18], ABAQUS [14], and rock failure process analysis (RFPA) [19][20][21][22][23][24][25][26][27][28][29], have been used for modeling. As shown in Table 1, LS-DYNA was widely used by scholars to simulate rock-tool interaction.…”

Section: Previous Numerical Simulations Of Rock Cuttingmentioning

confidence: 99%

“…RFPA, which was developed by the Northeastern University of China, is a professional rock failure analysis tool and has been widely used to analyze 2D rock failure problems in recent years. As a scientific research team, Tang and his partners have performed many studies on rock fragmentation mechanism, simulating the progress of rock cutting using RFPA (2D) [19][20][21][22][23][24][25][26][27][28][29]. DEM is a numerical method for simulating a discontinuous medium, and it is widely used in slope stability, tunnel excavation, and rock dynamic behavior simulations.…”

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confidence: 99%

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Numerical Simulation of Fragment Separation during Rock Cutting Using a 3D Dynamic Finite Element Analysis Code

Wan

Zeng

et al. 2017

Advances in Materials Science and Engineering

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To predict fragment separation during rock cutting, previous studies on rock cutting interactions using simulation approaches, experimental tests, and theoretical methods were considered in detail. This study used the numerical code LS-DYNA (3D) to numerically simulate fragment separation. In the simulations, a damage material model and erosion criteria were used for the base rock, and the conical pick was designated a rigid material. The conical pick moved at varying linear speeds to cut the fixed base rock. For a given linear speed of the conical pick, numerical studies were performed for various cutting depths and mechanical properties of rock. The numerical simulation results demonstrated that the cutting forces and sizes of the separated fragments increased significantly with increasing cutting depth, compressive strength, and elastic modulus of the base rock. A strong linear relationship was observed between the mean peak cutting forces obtained from the numerical, theoretical, and experimental studies with correlation coefficients of 0.698, 0.8111, 0.868, and 0.768. The simulation results also showed an exponential relationship between the specific energy and cutting depth and a linear relationship between the specific energy and compressive strength. Overall, LS-DYNA (3D) is effective and reliable for predicting the cutting performance of a conical pick.

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Section: Numerical Results and Discussionmentioning

confidence: 96%

Section: Previous Numerical Simulations Of Rock Cuttingmentioning

confidence: 99%

mentioning

confidence: 99%

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Numerical Simulation of Fragment Separation during Rock Cutting Using a 3D Dynamic Finite Element Analysis Code

Wan

Zeng

et al. 2017

Advances in Materials Science and Engineering

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“…A vast state of the art exists on the experimental, analytical and numerical description of brittle rock fracture under indentation and multiple indentation, i.e. with several buttons [13]. As far as the numerical simulations are concerned, the substantial influence of (i) the presence and position of the cap and (ii) the strain rate and viscous effects, on the predicted (iii) stress distribution under the buttons and (iv) force versus displacement curve resulting from the bit-rock interaction (BRI) were enlightened [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of drill bit drop tests on Kuru granite

Fourmeau

Kane

Hokka

2017

Phil. Trans. R. Soc. A.

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One contribution of 15 to a theme issue 'Experimental testing and modelling of brittle materials at high strain rates'. This paper presents an experimental and numerical study of Kuru grey granite impacted with a sevenbuttons drill bit mounted on an instrumented drop test machine. The force versus displacement curves during the impact, so-called bit-rock interaction (BRI) curves, were obtained using strain gauge measurements for two levels of impact energy. Moreover, the volume of removed rock after each drop test was evaluated by stereo-lithography (threedimensional surface reconstruction). A modified version of the Holmquist-Johnson-Cook (MHJC) material model was calibrated using Kuru granite test results available from the literature. Numerical simulations of the single drop tests were carried out using the MHJC model available in the LS-DYNA explicit finite-element solver. The influence of the impact energy and additional confining pressure on the BRI curves and the volume of the removed rock is discussed. In addition, the influence of the rock surface shape before impact was evaluated using two different mesh geometries: a flat surface and a hyperbolic surface. The experimental and numerical results are compared and discussed in terms of drilling efficiency through the mechanical specific energy.This article is part of the themed issue 'Experimental testing and modelling of brittle materials at high strain rates'.

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“…The beginning of the numerical analysis in simulation of crack in rock can be traced back to the investigations performed by Cundall in (1971) [8]. Using the finite element method to investigate the initiation and propagation of crack and rock fragmentation by indentation tools can be found, for example, in the works of these researchers [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Crack Analysis of Blunt Rock Indenters by an Indirect Boundary Element Method

Tayarani¹,

Marji²

2013

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Linear elastic fracture mechanics principles are widely applied for the analysis of crack problems in rock fracture mechanics. Rock indentation is an important and complicated problem among rock engineering issues. In this paper, in addition to the fracture criterion of maximum tangential stress adjacent to crack tip, the higher order displacement discontinuity method (which is a version of the indirect boundary element method) has been used for modeling the crack propagation mechanism under blunt indenters. In order to achieve more accurate results, higher order boundary elements i.e. quadratic elements, has been used to calculate displacement discontinuities and also to reduce the singularities of stress and displacement fields near the crack tip, the special crack tip elements has been used to calculate the stress intensity factors (SIF) at the crack tips. In this modeling, the effect of crack angle on stress intensity factors has been investigated. The numerical results of stress intensity factors obtained from some example problems were compared to the theoretical and experimental results cited in the literature which always show a percentage error less than one percent. The simulated results may pave the way for increasing the efficiency of mining and drilling by improving the design of tools and indentation equipments.

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Numerical Studies on Bit-Rock Fragmentation Mechanisms

Cited by 62 publications

References 32 publications

Numerical Simulation of Fragment Separation during Rock Cutting Using a 3D Dynamic Finite Element Analysis Code

Numerical Simulation of Fragment Separation during Rock Cutting Using a 3D Dynamic Finite Element Analysis Code

Experimental and numerical study of drill bit drop tests on Kuru granite

Numerical Crack Analysis of Blunt Rock Indenters by an Indirect Boundary Element Method

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