Crack propagation and coalescence in brittle materials under compression

Tang, Chun’an; Kou, Shaoquan

doi:10.1016/s0013-7944(98)00067-8

Cited by 221 publications

(93 citation statements)

References 19 publications

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“…Wong et al [21], Tang and Kou [22], and Tang et al [23] performed uniaxial and biaxial compression on numerical model samples containing a number of large, preexisting flaws and a row of suitably oriented smaller flaws by RFPA2D software, which shows that the crack growth is stable and stops at some finite crack length with the increase of lateral pressure, while a lateral tensile stress with even a small value will result in an unstable crack growth after a critical crack length is attained. Yang and Jing [14] It was found that the uniaxial compressive strength, Young's modulus, and peak axial strain of sandstone samples with preexisting single fissure are all lower than those of intact sandstone sample, which is closely related to the fissure length and fissure angle.…”

Section: Introductionmentioning

confidence: 98%

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Dai

Zhang

2018

Shock and Vibration

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To investigate the crack behaviour of rock or rock-like material in uniaxial loading, a series of numerical simulations were conducted on gypsum specimens containing a single flaw with different inclination angle (0 ∘ -90 ∘ ) and length (10 mm-30 mm). Based on the numerical simulations results, the effect of flaw length on peak strength, the CI stress, and the CD stress were investigated with different inclination angles. The results show that the peak strength decreased initially and then increased with increasing of the flaw angle. Meanwhile, the peak strength decreased gradually when the length of the preexisting flaw increased. When the inclination angle was 30 ∘ , 45 ∘ , and 60 ∘ , the reduction degree of peak strength increased with increasing of the flaw length. The CI stress and CD stress not only depend on the inclination angle but also depend on flaw length. Four types of crack were observed in numerical simulations. The present research facilitates increased understanding of crack behaviour of rock under different conditions.

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Section: Introductionmentioning

confidence: 98%

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Dai

Zhang

2018

Shock and Vibration

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“…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]. Previous studies have shown that there are mainly two kinds of cracks developed from the tips of preexisting fissure: wing crack and secondary crack [4,8,11,21,22].…”

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 simulation is another common approach that has been used to investigate the failure mechanism and the mechanical behavior of non-persistent joints using techniques such as the finite element method, realistic failure processing analysis, particle flow code), displacement discontinuity method, boundary element method, distinct element method, and a hybridized indirect boundary element method) [16][17][18][19][20][21][22]. Particle flow code, a distinct element method first induced by Cundall and stark [23], models the mechanical behavior of rock and soils.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Shear Behaviour of Non- Persistent Joints under Low and High Normal Loads

Sarfarazi

Ghazvinian

Schubert³

2016

Period. Polytech. Civil Eng.

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In this paper, the effect of rock bridge surface on the shear behavior of planar non-persistent joints under low and high normal loads has been investigated using particle IntroductionThe shear sliding of non-persistent joints are important factors in controlling the mechanical behaviour of rock masses (Einstein [1], Wong [2]). As known, it is difficult and costly to perform field tests to investigate the mechanical behavior of jointed rock masses. Therefore, laboratory tests are commonly conducted to study the influence of joint geometry configurations on the mechanical behavior of jointed blocks [3][4][5][6]. The crack initiation, propagation and coalescence of jointed specimens with less than three open flaws under uniaxial or biaxial compression [7][8][9] have been investigated by many researchers. In these studies, both tensile and shear cracks have been observed [7][8][9][10][11]. Lajtai [12,13], tensile wing cracks were found to first appear at the tips of horizontal joints, followed by the secondary shear cracks propagating towards the opposite joint. Mughieda et al. [14] made a thorough analysis on the Fracture mechanisms of offset rock joints. Gehle and Kutter's [15] investigation on the breakage and shear behaviour of intermittent rock joints under direct shear loading condition showed that joint orientation is an important influential parameter for shear resistance of jointed rock.In laboratory tests, it is difficult to measure the failure mechanism of rock bridge during the loading process. Numerical simulation is another common approach that has been used to investigate the failure mechanism and the mechanical behavior of non-persistent joints using techniques such as the finite element method, realistic failure processing analysis, particle flow code), displacement discontinuity method, boundary element method, distinct element method, and a hybridized indirect boundary element method) [16][17][18][19][20][21][22]. Particle flow code, a distinct element method first induced by Cundall and stark [23], models the mechanical behavior of rock and soils. The materials are envisioned as an assembly comprised of arbitrary spherical particles (in 3D case) or circular disks (in 2D case) in the PFC program. Kulattilake et al [24] were the pioneers in providing a realistic calibration procedure for micro-mechanical parameters of PFC3D for a contact bonded particle model. They also established a jointed rock model by using closed flaws and investigated the relation between micro-parameters and macro-

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Crack propagation and coalescence in brittle materials under compression

Cited by 221 publications

References 19 publications

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

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

Numerical Simulation of Shear Behaviour of Non- Persistent Joints under Low and High Normal Loads

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