Fracture of brittle and quasi-brittle materials in compression: A review of the current state of knowledge and a different approach

Iskander, Mina; Shrive, Nigel G.

doi:10.1016/j.tafmec.2018.08.014

Cited by 26 publications

(9 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the simulation results, 3D crack surface during fracture process can be predicted, and the crack path was clearly parallel to the compression direction, started from the cylindrical hole, and then grew along with compression direction, which is a shear fracture failure mode. In addition, we can find that the predicted crack growth path agrees well with the experimental results (Iskander and Shrive, 2018), which was also sufficient to support the effectiveness and modeling capability of this developed method.…”

Section: D Fracture Process Simulation Of the Numerical Example And E...supporting

confidence: 76%

See 1 more Smart Citation

A continuum damage-based three-dimensional fracture simulation method for brittle-like materials

Sun

2021

International Journal of Damage Mechanics

View full text Add to dashboard Cite

Current numerical methods cannot simulate well three-dimensional (3D) fracture process of solids. In order to study 3D fracture process of brittle-like materials and improve crack growth path prediction accuracy, a method is developed based on continuum damage mechanics and finite element method. In the developed method, damage is computed by homogenizing stress or strain in the preset characteristic field for reducing the spurious mesh sensitivity. Meanwhile, an additional procedure is used to consider the unstable and competing fracture process, which can be used to consider stress redistribution due to local damage evolution during the fracture process simulation. In addition, a damage model of concrete is also developed and used to describe material damage. Finally, 3D fracture process of two numerical examples, were simulated and compared with the experimental results by using the developed method. The 3D crack growth path and macroscopic mechanical behaviors can be predicted by the developed method coupled with a damage model. From the comparison, the effectiveness and modeling capability of the developed method are verified, which can be used to study 3D fracture mechanisms of concrete-like materials.

show abstract

Section: D Fracture Process Simulation Of the Numerical Example And E...supporting

confidence: 76%

“…The same loading strategy was applied in simulations by using the finite element model shown in Figure 12(b). The details of the experiment can be found in Iskander and Shrive (2018), and are not presented without further discussion as the purpose of experiments was to prove that the effectiveness of the developed method.…”

Section: Concrete Prismatic Specimenmentioning

confidence: 99%

A continuum damage-based three-dimensional fracture simulation method for brittle-like materials

Sun

2021

International Journal of Damage Mechanics

View full text Add to dashboard Cite

show abstract

“…Geotechnical engineering reinforcement plays an important role in its stability and safety, especially for fractured rock mass and soft soil layer [1][2][3][4][5][6][7]. While drilling and punching piles for mud-retaining walls in sand areas, there are problems such as muddy ground, stress relaxation, sediment, and disturbance of bearing end resistance so that the pile-end resistance and pile side friction resistance are significantly reduced [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Diffusion Law of Post‐Grouting Slurry in Sandy Soil

Yang

Cheng

Chen

2019

Advances in Civil Engineering

View full text Add to dashboard Cite

In order to study the diffusion law of grouting slurry in sand areas, the grouting of cement slurry in sand was analyzed by the indoor grouting test under different water-cement ratios, grouting pressures, grouting amounts, and soil qualities, and the law of the post-grouting slurry is obtained. The results show that the grouting method is affected by the grouting pressure, water-cement ratio, grouting amount, and soil quality. Under the same grouting pressure, the diffusion modes of different water-cement ratio grouts in sands with different permeability coefficients, which are mainly manifested as osmotic diffusion, are basically the same; under the same water-cement ratio, when the grouting pressure is relatively small, the diffusion of modes of slurry is mainly osmotic in sand. The diffusion radius of cement slurry in sand has a good power function relationship with grouting pressure, water-cement ratio, permeability coefficient, and grouting amount. And, the empirical function model of slurry diffusion radius is proposed by regression analysis. The research results provide a certain theoretical and experimental reference for post-grouting in sandy areas.

show abstract

“…The Poisson effect is only a simple phenomenological model. Compression caused splitting on unloaded planes in brittle material has been explained by tensile stress at in homogeneities of grains in rock matrix or by unstable micro-cracking and fracture mechanics using stress intensity factor (Horii and Nemat-Nasser 1986;Iskander and Shrive 2018). A numerical simulation (bonded disc model) is used in Diederichs (2003) to illustrate the generation of both grain scale tension and more regional tensile stress through heterogeneity of rock.…”

Section: The Simple Extension Strain Criterionmentioning

confidence: 99%

An Extension Strain Type Mohr–Coulomb Criterion

Staat

2021

Rock Mech Rock Eng

View full text Add to dashboard Cite

Extension fractures are typical for the deformation under low or no confining pressure. They can be explained by a phenomenological extension strain failure criterion. In the past, a simple empirical criterion for fracture initiation in brittle rock has been developed. In this article, it is shown that the simple extension strain criterion makes unrealistic strength predictions in biaxial compression and tension. To overcome this major limitation, a new extension strain criterion is proposed by adding a weighted principal shear component to the simple criterion. The shear weight is chosen, such that the enriched extension strain criterion represents the same failure surface as the Mohr–Coulomb (MC) criterion. Thus, the MC criterion has been derived as an extension strain criterion predicting extension failure modes, which are unexpected in the classical understanding of the failure of cohesive-frictional materials. In progressive damage of rock, the most likely fracture direction is orthogonal to the maximum extension strain leading to dilatancy. The enriched extension strain criterion is proposed as a threshold surface for crack initiation CI and crack damage CD and as a failure surface at peak stress CP. Different from compressive loading, tensile loading requires only a limited number of critical cracks to cause failure. Therefore, for tensile stresses, the failure criteria must be modified somehow, possibly by a cut-off corresponding to the CI stress. Examples show that the enriched extension strain criterion predicts much lower volumes of damaged rock mass compared to the simple extension strain criterion.

show abstract

Fracture of brittle and quasi-brittle materials in compression: A review of the current state of knowledge and a different approach

Cited by 26 publications

References 32 publications

A continuum damage-based three-dimensional fracture simulation method for brittle-like materials

A continuum damage-based three-dimensional fracture simulation method for brittle-like materials

Experimental Study on Diffusion Law of Post‐Grouting Slurry in Sandy Soil

An Extension Strain Type Mohr–Coulomb Criterion

Contact Info

Product

Resources

About