Numerical Assessment of the Progressive Rock Fracture Mechanism of Cracked Chevron Notched Brazilian Disc Specimens

Dai, Feng; Wei, Mingdong; Xu, Nuwen; Ma, Yuanjun; Yang, Diansen

doi:10.1007/s00603-014-0587-8

Cited by 96 publications

(26 citation statements)

References 47 publications

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“…In other words, the critical dimensionless crack length (a m ), the minimal stress intensity factor (Y Ã min ) as well as the Mode-I fracture toughness (K IC ) determined with current straight-through crack propagation assumption are underestimated. This explains why the measured values of fracture toughness via chevron notched methods are generally smaller than those from other comparable methods in a certain degree [42,[44][45][46]. Conventionally, for samples S I and S II , while b = 0.8, a m are calibrated as 0.48 and 0.41; and Y Ã min are 7.951 and 8.044 respectively, based on the straight-through crack assumption.…”

Section: Discussionmentioning

confidence: 95%

“…The same circumstance of deviating damages outside the notch ligament occurs for the progressive fracture of CCNBD specimen [42]. Fig.…”

Section: Progressive Fracture Of Ccnscb Specimens With Different Bmentioning

confidence: 86%

“…To illustrate the progressive fracture mechanism under different configurations, a standard CCNSCB sample (denoted as S I ) with the same sample geometry as the ISRM suggested CCNBD specimen [13] is demonstrated throughout this study. To compare the fracture mechanism between the CCNSCB and CCNBD method [42], specimen S II , which has a more slender notch ligament than S I , is also simulated. The dimension parameters of S I and S II are tabulated in Table 1, both of which satisfy the dimensional requirement of chevron notched samples described in Eq.…”

Section: Model Setupmentioning

confidence: 99%

See 2 more Smart Citations

Three-dimensional numerical evaluation of the progressive fracture mechanism of cracked chevron notched semi-circular bend rock specimens

Wei

Dai

et al. 2015

Engineering Fracture Mechanics

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Section: Discussionmentioning

confidence: 95%

“…The same circumstance of deviating damages outside the notch ligament occurs for the progressive fracture of CCNBD specimen [42]. Fig.…”

Section: Progressive Fracture Of Ccnscb Specimens With Different Bmentioning

confidence: 86%

Section: Model Setupmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional numerical evaluation of the progressive fracture mechanism of cracked chevron notched semi-circular bend rock specimens

Wei

Dai

et al. 2015

Engineering Fracture Mechanics

Self Cite

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“…Ghazvinian et al [17] performed experimental study on crack propagation in rock-like material of low brittleness and numerical modeling to assess the effect of crack length on the failure mode of central straight through crack Brazilian disc (CSCBD) specimens. Dai et al [18] simulated the progressive rock fracture mechanism of cracked chevron notched Brazilian disc (CC-NBD) rock specimens by RFPA 3D . The numerical results showed that cracks initiated from the jag notch tip and propagated towards the loading ends.…”

Section: Introductionmentioning

confidence: 99%

Particle flow study on strength and meso-mechanism of Brazilian splitting test for jointed rock mass

Yang

Huang

2014

Acta Mech Sin

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A discrete element method (DEM) called particle flow code (PFC 2D ) was used to construct a model for Brazilian disc splitting test in the present study. Based on the experimental results of intact Brazilian disc of rock-like material, a set of micro-parameters in PFC 2D that reflected the macro-mechanical behavior of rock-like materials were obtained. And then PFC 2D was used to simulate Brazilian splitting test for jointed rock mass specimens and specimen containing a central straight notch. The effect of joint angle and notch angle on the tensile strength and failure mode of jointed rock specimens was detailed analyzed. In order to reveal the meso-mechanical mechanism of crack coalescence, displacement trend lines were applied to analyze the displacement evolution during the crack initiation and propagation. The investigated conclusions can be described as follows.(1) The tensile strength of jointed rock mass disc specimen is dependent to the joint angle. As the joint angle increases, the tensile strength of jointed rock specimen takes on a nonlinear variance. (2) The tensile strength of jointed rock mass disc specimen containing a central straight notch distributes as a function of both joint angle and notch angle. (3) Three major failure modes, i.e., pure tensile failure, shear failure and mixed tension and shear failure mode are observed in jointed rock mass disc specimens under Brazilian test. (4) The notch angle and joint angle play important roles on crack initiation and propagation characteristics of jointed rock mass disc specimen containing a central straight notch under Brazilian test.

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“…Rock fragmentation processes subjected to static and dynamic loading were examined by the numerical code RFPA [17]. The progressive rock fracture mechanism of cracked chevron notched Brazilian disc rock specimens was numerically simulated [18]. Surface crack initiation and propagation were numerically investigated via parallel finite element analysis [19].…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism of Rock Bridge Based on Acoustic Emission Technique

2015

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Acoustic emission (AE) technique is widely used in various fields as a reliable nondestructive examination technology. Two experimental tests were carried out in a rock mechanics laboratory, which include (1) small scale direct shear tests of rock bridge with different lengths and (2) large scale landslide model with locked section. The relationship of AE event count and record time was analyzed during the tests. The AE source location technology and comparative analysis with its actual failure model were done. It can be found that whether it is small scale test or large scale landslide model test, AE technique accurately located the AE source point, which reflected the failure generation and expansion of internal cracks in rock samples. Large scale landslide model with locked section test showed that rock bridge in rocky slope has typical brittle failure behavior. The two tests based on AE technique well revealed the rock failure mechanism in rocky slope and clarified the cause of high speed and long distance sliding of rocky slope.

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Numerical Assessment of the Progressive Rock Fracture Mechanism of Cracked Chevron Notched Brazilian Disc Specimens

Cited by 96 publications

References 47 publications

Three-dimensional numerical evaluation of the progressive fracture mechanism of cracked chevron notched semi-circular bend rock specimens

Three-dimensional numerical evaluation of the progressive fracture mechanism of cracked chevron notched semi-circular bend rock specimens

Particle flow study on strength and meso-mechanism of Brazilian splitting test for jointed rock mass

Failure Mechanism of Rock Bridge Based on Acoustic Emission Technique

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