Discrete element modelling of concrete submitted to dynamic loading at high strain rates

Hentz, Sébastien; Donzé, Frédéric; Daudeville, L.

doi:10.1016/j.compstruc.2004.05.016

Cited by 233 publications

(113 citation statements)

References 26 publications

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“…The uniaxial compression test is a common method for determining the mechanical properties of granular materials of interest to technological process designers. Both, physical [31,32] and numerical [10,[33][34][35][36] modeling of the compression of a granular solid may provide useful scientific insight and valuable knowledge necessary for efficient design.…”

Section: Methodsmentioning

confidence: 99%

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

Wiącek

Molenda

2018

Granular Matter

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The deformation of three-dimensional highly polydisperse packings of frictional spheres with continuous unimodal and discrete uniform particle size distributions (PSDs) under uniaxial compression was investigated, using the discrete element method. The stress transmission and elasticity parameters, i.e., the effective elastic modulus and the Poisson's ratio of the granular assemblies were examined; these parameters are important in many engineering disciplines. The influence of the shape of the PSD on the porosity and the transmission of pressures in samples was observed; however, the shape of the PSD did not affect the stiffness and the Poisson's ratio of polydisperse granular packings. The results revealed that, in some cases, knowledge of the grain size distribution is not a critical issue for modeling granular packings composed of non-uniformly sized spheres.

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Section: Methodsmentioning

confidence: 99%

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

Wiącek

Molenda

2018

Granular Matter

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“…The slab is thus modeled as a continuous material with an elastic-brittle constitutive behavior. Yet, similar to what is classically done for concrete (Meguro and Hakuno, 1989;Kusano et al, 1992;Camborde et al, 2000;Hentz et al, 2004), the response of this layer to the dynamic propagation of failure in the WL is also computed with the DE method. In that case, however, the considered elements (grains of size r) have no physical meaning and should only be regarded as entities of discretization similar to the mesh size in FE models.…”

Section: Motivation and Objectivesmentioning

confidence: 99%

“…Cundall (1989); Iwashita and Oda (2000) for frictional granular materials or Hagenmuller et al (2015) for snow), the grains involved in the DE model developed in this study should not be regarded as snow grains, and that both r wl and r are only discretization scales whose choice will result from a compromise between resolution and computational cost as classically done to model concrete fracture (Hentz et al, 2004). We consider here a meter-scale model where the advantage of the DE method is its ability to mimic the poorly known mechanical response of the weak layer and to account for the different modes of failure displayed by snow (shear, compression, tension).…”

Section: Motivation and Objectivesmentioning

confidence: 99%

Modeling of crack propagation in weak snowpack layers using the discrete element method

Gaume¹,

Herwijnen²,

Chambon

et al. 2015

The Cryosphere

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Abstract. Dry-snow slab avalanches are generally caused by a sequence of fracture processes including (1) failure initiation in a weak snow layer underlying a cohesive slab, (2) crack propagation within the weak layer and (3) tensile fracture through the slab which leads to its detachment. During the past decades, theoretical and experimental work has gradually led to a better understanding of the fracture process in snow involving the collapse of the structure in the weak layer during fracture. This now allows us to better model failure initiation and the onset of crack propagation, i.e., to estimate the critical length required for crack propagation. On the other hand, our understanding of dynamic crack propagation and fracture arrest propensity is still very limited.To shed more light on this issue, we performed numerical propagation saw test (PST) experiments applying the discrete element (DE) method and compared the numerical results with field measurements based on particle tracking. The goal is to investigate the influence of weak layer failure and the mechanical properties of the slab on crack propagation and fracture arrest propensity. Crack propagation speeds and distances before fracture arrest were derived from the DE simulations for different snowpack configurations and mechanical properties. Then, in order to compare the numerical and experimental results, the slab mechanical properties (Young's modulus and strength) which are not measured in the field were derived from density. The simulations nicely reproduced the process of crack propagation observed in field PSTs. Finally, the mechanical processes at play were analyzed in depth which led to suggestions for minimum column length in field PSTs.

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“…The method was first developed in the early 1980s (1). More recently, researchers have used this method to study damage in heterogeneous solids, such as concrete (2) or rock (3), and homogeneous materials, such as ceramics (4).…”

Section: Introductionmentioning

confidence: 99%

Using the discrete element method to simulate brittle fracture in the indentation of a silica glass with a blunt indenter

Debenath

Jebahi

Iordanoff

et al. 2013

Computer Methods in Applied Mechanics and Engineering

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThe mechanical behavior of materials is usually simulated by a continuous mechanics approach. However, noncontinuous phenomena such as multi-fracturing cannot be accurately simulated using a continuous description. The discrete element method (DEM) naturally accounts for discontinuities and is therefore a good alternative to the continuum approach.This study continues previous work in which a DEM model was developed to quantitatively simulate an elastic material with the cohesive beam bond model. The simulation of brittle cracks is now tackled. This goal is attained by computing a failure criterion based on an equivalent hydrostatic stress. This microscopic criterion is then calibrated to fit experimental values of the macroscopic failure stress. The simulation results are compared to experimental results of indentation tests in which a spherical indenter is used to load a silica glass, which is considered to be a perfectly brittle elastic material.

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Discrete element modelling of concrete submitted to dynamic loading at high strain rates

Cited by 233 publications

References 26 publications

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

Modeling of crack propagation in weak snowpack layers using the discrete element method

Using the discrete element method to simulate brittle fracture in the indentation of a silica glass with a blunt indenter

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