Crack coalescence in specimens with open and closed flaws: A comparison

Park, Chi Hyun; Bobet, Antonio

doi:10.1016/j.ijrmms.2009.02.006

Cited by 426 publications

(148 citation statements)

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“…The initiation and propagation of multiple cracks significantly affect many rock engineering problems, such as rock cutting, hydraulic fracturing, and explosive fracturing [1]. In the past decades, crack propagation in rocks has received attentions from many researches [2][3][4][5], among which many novel tests were applied to investigate crack patterns under compressive loads, such as the notched semi-circular bending tests (NSCB) [6], the cracked chevron notched semi-circular bending method (CCNSCB) [7], and the Brazil splitting tests [8]. …”

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confidence: 99%

Fracture Propagation in Brazilian Discs with Multiple Pre-existing Notches by Using a Phase Field Method

Zhou

2018

Period. Polytech. Civil Eng.

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The crack propagation in the Brazilian discs with multiple preexisting notches is investigated by using a phase field method. Keywords phase field method, Brazilian disc, multiple notches IntroductionNatural rocks contain abundant cracks and usually show heterogeneity. Under loading, cracks initiate, propagate, and coalesce with other cracks, thereby decreasing the strength of rocks. The initiation and propagation of multiple cracks significantly affect many rock engineering problems, such as rock cutting, hydraulic fracturing, and explosive fracturing [1]. In the past decades, crack propagation in rocks has received attentions from many researches [2][3][4][5], among which many novel tests were applied to investigate crack patterns under compressive loads, such as the notched semi-circular bending tests (NSCB) [6], the cracked chevron notched semi-circular bending method (CCNSCB) [7], and the Brazil splitting tests [8].

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confidence: 99%

Fracture Propagation in Brazilian Discs with Multiple Pre-existing Notches by Using a Phase Field Method

Zhou

2018

Period. Polytech. Civil Eng.

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“…It observed all flaw inclination angles, wing cracks, and secondary cracks initiate at the same stress level. Park and Bobet [16] investigated crack coalescence in gypsum specimens with open and closed flaws under compression and one of their results showed that the mean wing and secondary crack initiation stresses increase with flaw inclination angle and coalescence stress slightly increases as the flaw angle increases. Yang and Jing [14] analysed strength failure and crack coalescence behaviour of brittle sandstone samples containing a single fissure (angle from 0 ∘ to 75 ∘ ) under uniaxial compression.…”

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confidence: 99%

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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“…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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Crack coalescence in specimens with open and closed flaws: A comparison

Cited by 426 publications

References 19 publications

Fracture Propagation in Brazilian Discs with Multiple Pre-existing Notches by Using a Phase Field Method

Fracture Propagation in Brazilian Discs with Multiple Pre-existing Notches by Using a Phase Field Method

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

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