Strain-rate dependency of the dynamic tensile strength of rock

Cho, Sang-Ho; Ogata, Yoichi; Kaneko, Katsuhiko

doi:10.1016/s1365-1609(03)00072-8

Cited by 256 publications

(75 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dynamic loading is commonly encountered due to shocks, blasting, high-speed trains, etc. If the loading rate is very high during experiment, waves are propagated and their superposition produces a stress distribution different from the quasi-static situation (Kumar 1968;Zhang et al 2000;Cho et al 2003;Zhu and Tang 2006). However, no universal loading rate threshold has been established to differentiate between quasi-static and dynamic behaviours of the material.…”

Section: Loadingmentioning

confidence: 99%

See 1 more Smart Citation

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Cerfontaine¹,

Collin²

2017

Rock Mech Rock Eng

293

View full text Add to dashboard Cite

Section: Loadingmentioning

confidence: 99%

“…A loading rate equal to 0.05 MPa/s for uniaxial compression experiment on granite is proposed in Zhao (2000). A threshold of deformation rate equal around 0.1-1 s −1 is proposed in Cho et al (2003) for a Hopkinson bar test on granite.…”

Section: Loadingmentioning

confidence: 99%

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Cerfontaine¹,

Collin²

2017

Rock Mech Rock Eng

293

View full text Add to dashboard Cite

“…Discontinuities play a critical role in creating a complex fracture network, and the influence of dynamic tension on the evolution of the fracturing network, which should be deeply investigated. Among the published literature, the Brazilian test [10,11], flattened Brazilian disc tests [12][13][14][15][16], Semicircular bending (SCB) test [17], and the split Hopkinson pressure bar (SHPB) tests [18][19][20][21] were mainly adopted to research the mechanical properties of rock material under dynamic tension. It was found that the strength of rock presented rate dependency; rock strength increases with the increase of strain rate, and almost all the studies are focused on dolerite [22], limestone [10], granite [17,19], tuff [21], sandstone [23], and basalt [21].…”

Section: Introductionmentioning

confidence: 99%

Brazilian Test for Tensile Failure of Anisotropic Shale under Different Strain Rates at Quasi-static Loading

Wang

et al. 2017

Energies

View full text Add to dashboard Cite

Shale formations show obvious anisotropic characteristics in their mechanical properties due to pronounced bedding planes and natural fractures. This anisotropic behavior generally creates complex fracturing networks and is crucial to gas shale stimulation. Although much research has been done to study the anisotropic compression behaviors of shale with static and quasi-static strain rates, there are limited investigations addressing the anisotropic tensile behaviors of shale at quasi-static strain rate. In this work, the anisotropic tensile behaviors of Longmaxi shales were studied systematically at different strain rates from 10 −5 to 10 −2 s −1 by performing Brazilian splitting tests. Testing results reveal the tensile strength anisotropy, rate dependency, and the stimulated fracture pattern morphology. The results show that the orientation between the applied force and bedding direction has an obvious effect on the tensile strength and fracture pattern. The rate dependency of shale under different loading rates is different for shale samples with various orientations. It was suggested that a complex tensile fracture pattern can be easily formed when using a high loading rate. The result sheds light on how to stimulate a complex fracturing network during field hydraulic fracturing treatment.

show abstract

“…The crack initiation step can be simulated using sophisticated ratedependent constitutive models. Several models have been proposed for random generation of cracks in rocks under dynamic loading, including Cho et al (2004aCho et al ( , 2008, Cho and Kaneko (2004), Zhu et al (2004Zhu et al ( , 2007, and Ma and An (2008). The second stage of gas fracturing, gas penetration into existing cracks, is of great importance because it predominantly determines the final crack extension.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of rock fracturing by gas pressure using the extended finite element method

2015

View full text Add to dashboard Cite

High energy gas fracturing is a simple approach of applying high pressure gas to stimulate wells by generating several radial cracks without creating any other damages to the wells. In this paper, a numerical algorithm is proposed to quantitatively simulate propagation of these fractures around a pressurized hole as a quasi-static phenomenon. The gas flow through the cracks is assumed as a one-dimensional transient flow, governed by equations of conservation of mass and momentum. The fractured medium is modeled with the extended finite element method, and the stress intensity factor is calculated by the simple, though sufficiently accurate, displacement extrapolation method. To evaluate the proposed algorithm, two field tests are simulated and the unknown parameters are determined through calibration. Sensitivity analyses are performed on the main effective parameters. Considering that the level of uncertainty is very high in these types of engineering problems, the results show a good agreement with the experimental data. They are also consistent with the theory that the final crack length is mainly determined by the gas pressure rather than the initial crack length produced by the stress waves.

show abstract

Strain-rate dependency of the dynamic tensile strength of rock

Cited by 256 publications

References 10 publications

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Brazilian Test for Tensile Failure of Anisotropic Shale under Different Strain Rates at Quasi-static Loading

Numerical analysis of rock fracturing by gas pressure using the extended finite element method

Contact Info

Product

Resources

About