A complete three-dimensional continuum model of wing-crack growth in granular brittle solids

Kolari, Kari

doi:10.1016/j.ijsolstr.2017.02.012

Cited by 32 publications

(17 citation statements)

References 50 publications

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“…Thus, the focus is on the parent crack nucleation model; the crack growth and interaction of cracks and so forth are not considered here. To test the nucleation model, it is embedded in the wing crack model of the author (Kolari, ).…”

Section: Modelmentioning

confidence: 99%

“…Once the parent orientation is known, the wing crack is assumed to initiate and propagate as described by the author (Kolari, ) and shown in Figures c and d.…”

Section: Modelmentioning

confidence: 99%

“…Most of the parameters are the same as applied in the analysis of granular ice by the author (Kolari, ). The new parameters given in Table are the taper angle γ and angle Ψ between the parent crack and the sliding plane.…”

Section: Numerical Verificationmentioning

confidence: 99%

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Modeling Splitting and Spalling of Columnar Ice Compressed Biaxially: The Role of Crack Nucleation

Kolari

2019

JGR Solid Earth

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Columnar ice exhibits three failure modes under increasing lateral confinement across the columns: splitting, Coulombic shear faulting, and spalling. Modeling of the splitting-to-spalling transition under increasing confined compression is considered here. Shear faulting is not considered. A three-dimensional crack nucleation model, based on a grain boundary sliding approach, is formulated to model brittle failure mechanisms under biaxial compression along and across the columns. The growth of the nucleated crack is based on the wing crack approach. The numerical results were in good agreement with experimental data for both across-column and along-column biaxial compression. The model shows that in columnar ice, crack nucleation preceded by sliding along tapered grain boundaries induces splitting-to-spalling transition under increasing confinement.

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Section: Modelmentioning

confidence: 99%

“…Once the parent orientation is known, the wing crack is assumed to initiate and propagate as described by the author (Kolari, ) and shown in Figures c and d.…”

Section: Modelmentioning

confidence: 99%

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Modeling Splitting and Spalling of Columnar Ice Compressed Biaxially: The Role of Crack Nucleation

Kolari

2019

JGR Solid Earth

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“…Materials like natural ice and rock are heterogeneous and crystalline with different behaviors under variation of applying forces. Generally, their behavior can be categorized in two main types, including ductile behavior under high confining pressures, and brittle behavior under low confining pressures [3]. Because most rocks are brittle at low temperature and low confining pressure, virtually most of the rocks at or near the Earth's surface exhibits brittle failure mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…One of the main mechanisms proposed for modelling of axial splitting is the sliding crack or "wing crack" model which was originally proposed for a 2D crack in a plate [3] [8] [9] [10]. Splitting failure begins with a primary crack (pre-crack) and then sliding mechanism creates secondary cracks or so called, wings, at the edges of those primary cracks.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Fairhurst-Cook Model for 2-D Wing Cracks Using Ant Colony Optimization (ACO), Particle Swarm Intelligence (PSO), and Genetic Algorithm (GA)

Najjarpour¹,

Jalalifar²

2018

JAMP

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The common failure mechanism for brittle rocks is known to be axial splitting which happens parallel to the direction of maximum compression. One of the mechanisms proposed for modelling of axial splitting is the sliding crack or so called, "wing crack" model. Fairhurst-Cook model explains this specific type of failure which starts by a pre-crack and finally breaks the rock by propagating 2-D cracks under uniaxial compression. In this paper, optimization of this model has been considered and the process has been done by a complete sensitivity analysis on the main parameters of the model and excluding the trends of their changes and also their limits and "peak points". Later on this paper, three artificial intelligence algorithms including Particle Swarm Intelligence (PSO), Ant Colony Optimization (ACO) and genetic algorithm (GA) has been used and compared in order to achieve optimized sets of parameters resulting in near-maximum or near-minimum amounts of wedging forces creating a wing crack.

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Strength of Ice in Brittle Regime—Multiscale Modelling Approach

Kolari

Kouhia

2022

IUTAM Symposium on Physics and Mechanics of Sea Ice

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A complete three-dimensional continuum model of wing-crack growth in granular brittle solids

Cited by 32 publications

References 50 publications

Modeling Splitting and Spalling of Columnar Ice Compressed Biaxially: The Role of Crack Nucleation

Modeling Splitting and Spalling of Columnar Ice Compressed Biaxially: The Role of Crack Nucleation

Optimization of Fairhurst-Cook Model for 2-D Wing Cracks Using Ant Colony Optimization (ACO), Particle Swarm Intelligence (PSO), and Genetic Algorithm (GA)

Strength of Ice in Brittle Regime—Multiscale Modelling Approach

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