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94343 |
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|a Nguyen, Duc-Hanh
|e author
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|a MIT Energy Initiative
|e contributor
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|a Radjai, Farhang
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|a Azema, Emilien
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|a Sornay, Philippe
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|a Radjai, Farhang
|e author
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|a Bonded-cell model for particle fracture
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|b American Physical Society,
|c 2015-02-11T21:38:11Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/94343
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|a Particle degradation and fracture play an important role in natural granular flows and in many applications of granular materials. We analyze the fracture properties of two-dimensional disklike particles modeled as aggregates of rigid cells bonded along their sides by a cohesive Mohr-Coulomb law and simulated by the contact dynamics method. We show that the compressive strength scales with tensile strength between cells but depends also on the friction coefficient and a parameter describing cell shape distribution. The statistical scatter of compressive strength is well described by the Weibull distribution function with a shape parameter varying from 6 to 10 depending on cell shape distribution. We show that this distribution may be understood in terms of percolating critical intercellular contacts. We propose a random-walk model of critical contacts that leads to particle size dependence of the compressive strength in good agreement with our simulation data.
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|a Article
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|t Physical Review E
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