Numerical Study on Coalescence of Pre-Existing Flaw Pairs in Rock-Like Material

Li, Huan Qiang; Wong, Louis Ngai Yuen

doi:10.1007/s00603-013-0504-6

Cited by 55 publications

(32 citation statements)

References 49 publications

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“…6b, are observed in the bridging region between the inner flaw tips. Li and Wong (2014) and Bobet and Einstein (1998) have indicated that the coalescence results from one central tensile crack segment in the bridging region between two inner flaw tips, or from the growth of two short shear crack segments originating from points with initial compressive stress concentration (Wong 2008;Ingraffea and Heuze 1980). In fact, despite the many reports on secondary shear crack segments, observation of the central tensile crack segment is not comprehensive (Mughieda and Alzo'ubi 2004).…”

Section: Parallelization Of Timestep Computationmentioning

confidence: 92%

“…In rock-like materials such as marble, the trajectory of the inner tensile wing crack seemed invisible or appeared as faint lines because of the existence of the white patches (Wong 2008). The white patch in the bridging region later developed into a short tensile crack segment, which subsequently lengthened and formed a continuous tensile crack, coalescing the two inner flaw tips (Bobet 2000;Park and Bobet 2009;Zhang and Wong 2012;Wong 2008;Li and Wong 2014;Ingraffea and Heuze 1980;Bobet and Einstein 1998;Mughieda and Alzo'ubi 2004;Li et al 2005).…”

Section: Figmentioning

confidence: 96%

“…Integration of I/O libraries into OpenMP distributions may provide additional opportunities for improving the program performance. Bobet (2000), Park and Bobet (2009), Zhang and Wong (2012), Wong (2008), and Li and Wong (2014) have studied the coalescence mechanism under the effect of flaw arrangement. However, little attention has been paid to the mechanism origin of the secondary crack, which results in coalescence between two artificially created flaws (Wong 2008).…”

Section: Parallelization Of Timestep Computationmentioning

confidence: 98%

“…6 Illustration of crack coalescence development sequence for a pair of artificially created flaws in marble specimens with the same bridging and flaw inclination angles, but with different ligament lengths. This illustration is taken from the experimental observations in (Li and Wong 2014;Li et al 2005) …”

Section: Parallelization Of Timestep Computationmentioning

confidence: 99%

See 3 more Smart Citations

Parallel programming of a peridynamics code coupled with finite element method

Lee

Hong

2016

Int J Fract

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Using OpenMP (the Open MultiProcessing application programming interface), dynamic peridynamics code coupled with a finite element method is parallelized. The parallel implementation improves run-time efficiency and makes the realistic simulation of crack coalescence possible. To assess the accuracy and efficiency of the parallel code, we investigate its speedup and scalability. In addition, to validate the parallel code, experimental results for crack coalescence development sequences are compared. It is noted that this parallelized code markedly reduces computation time along with the coupling scheme. Moreover, the coupling approach used in this parallel code enables a more realistic and feasible numerical prediction of coalescing fractures. With the parallel implementation, two main types of crack coalescences between two flaws, formed by two short shear cracks and by a short central tensile segment and subsequent shear cracks are in detail discussed in terms of their development sequences. Consequently, this proposed coupled peridynamics code can be used to efficiently solve actual coalescence development sequences, thereby providing a numerical solution for fracture mechanics.

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Section: Parallelization Of Timestep Computationmentioning

confidence: 92%

Section: Figmentioning

confidence: 96%

Section: Parallelization Of Timestep Computationmentioning

confidence: 98%

Section: Parallelization Of Timestep Computationmentioning

confidence: 99%

See 2 more Smart Citations

Parallel programming of a peridynamics code coupled with finite element method

Lee

Hong

2016

Int J Fract

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“…To better understand the mechanical behavior of jointed rock or rock-like materials, substantial experimental efforts have been devoted to the study of crack initiation, propagation, and failure modes of precracked rocks or rock-like specimens. Many kinds of joint geometries have been considered in previous works, such as joint inclination angle [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], joint distance [3,[15][16][17][18], and overlap distance [17][18][19]. At the same time, there are many kinds of materials that have been used by scholars, such as glass [5], Columbia Resin 39 [20], and molded gypsum [15,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Failure Behavior and Energy Mechanics of Rock-Like Materials Containing Multiple Joints

Cao

Lin

2017

Advances in Materials Science and Engineering

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This paper investigates the influence of joint geometry parameters on the characteristic stress, failure pattern, and energy mechanism of multiple jointed rock-like specimens under uniaxial compression. Both the laboratory and numerical results show that the higher value of UCS occurs when is around 0 ∘ and changes from 15 ∘ to 30 ∘ or when is around 30 ∘ and changes from 45 ∘ to 75 ∘ . However, the lowest value appears when is around 45 ∘ and changes from 15 ∘ to 30 ∘ . The CDiS (critical dilatancy stress) and CIS (crack initiation stress) show a similar tendency to UCS. Moreover, the specimens present different failure modes for various levels of , , and , and the failure mode can be classified into four categories: stepped path failure; failure through parallel plane; failure through cross plane; material failure. In addition, with higher strength, the input energy and strain energy are higher than those with lower strength. Dissipation energy is affected by the failure modes of the specimens. At the same time, when changes from 0.2 to 0.6, the boundary energy, strain energy, and dissipation energy show a decreasing trend.

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Numerical modeling of fracture process using a new fracture constitutive model with applications to 2D and 3D engineering cases

Chen

Zhou

Chemenda

et al. 2020

Energy Science & Engineering

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The overwhelming majority of experimental and numerical tests show the dependence of mechanical response on discontinuities (such as joints, faults, and bedding plane). In this study, fracture process is numerically investigated using finite‐difference method. A quasi‐continuum model (assuming that the real rock mass represents the sum of intact rock and fracture) has been developed to describe the fracture propagation in a fractured rock. First, this model has been validated against the experimental results and was shown to simulate satisfactorily the fracture propagation in the tensile, shear as well as the mixed (tensile and shear) modes. This model then has been used to investigate the fracture processes during the 2D long‐wall mining and 3D pillar failure. According to the 2D and 3D simulations, it was found that: (a) this model can provide a new reasonable approach to simulating fracture processes in either 2D or 3D cases; (b) roof failure is mainly caused by shear fractures rather than tensile fractures during the 2D long‐wall mining.

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Numerical Study on Coalescence of Pre-Existing Flaw Pairs in Rock-Like Material

Cited by 55 publications

References 49 publications

Parallel programming of a peridynamics code coupled with finite element method

Parallel programming of a peridynamics code coupled with finite element method

Experimental and Numerical Study of Failure Behavior and Energy Mechanics of Rock-Like Materials Containing Multiple Joints

Numerical modeling of fracture process using a new fracture constitutive model with applications to 2D and 3D engineering cases

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