Influence of the meso-structure in dynamic fracture simulation of concrete under tensile loading

Snozzi, Léonardo; Caballero, Antonio; Molinari, Jean‐François

doi:10.1016/j.cemconres.2011.06.016

Cited by 117 publications

(51 citation statements)

References 35 publications

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“…Obviously, the simulation-box size is an additional length scale in our simulations, and the interplay of all length scales is crucial for the understanding of the obtained results. The cohesive zone must contain several elements (typically around four [31]) and should be small compared to the sample size for mesh independency. The average element size for the analyses, which is the average side length for a regular tetrahedron element, is 2.1 mm.…”

Section: Cohesive Element Methodsmentioning

confidence: 99%

Damage cluster distributions in numerical concrete at the mesoscale

2017

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We investigate the size distribution of damage clusters in concrete under uniaxial tension loading conditions. Using the finite-element method, the concrete is modeled at the mesoscale by a random distribution of elastic spherical aggregates within an elastic mortar paste. The propagation and coalescence of damage zones are then simulated by means of dynamically inserted cohesive elements. Dynamic failure analysis shows that the size distribution of damage clusters follows a power law when a system-spanning cluster is first observed, with an exponent close to that of percolation theory. This is found for a range of selected mesostructural parameters, material defects, and applied strain rates. In all cases, the system-spanning cluster occurs prior to the onset of local decohesion, a regime of crack nucleation and propagation, and eventual material failure. The resulting fully damaged crack surfaces after failure are found to be only weakly correlated with the percolated damage region structures.

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Section: Cohesive Element Methodsmentioning

confidence: 99%

Damage cluster distributions in numerical concrete at the mesoscale

2017

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“…Indeed, [36] show that the confined compression test response is prevents us from using it to conduct an accurate identification of the friction coefficient. For this reason, this coefficient is set to an average value µ = 0.7, which leads to a coherent ductility.…”

Section: Frictionmentioning

confidence: 99%

Beam-particle approach to model cracking and energy dissipation in concrete: Identification strategy and validation

Vassaux¹,

Oliver-Leblond²,

Richard³

2016

Cement and Concrete Composites

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This paper focuses on the application of a beam-particle model to study the failure of concrete under complex loading. The formulation of the model is based both on lattice models and discrete elements models in order to capture cohesion, failure and frictional contact of the crack surfaces. To correctly describe the elastic phase, the peak load and the post-peak phase, the failure criteria is discussed and heterogeneities are introduced. The calibration of this model is detailed and illustrated. Finally, several test cases are analysed in order to validate the model.

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“…For example, the retardation of micro-cracking at high deformation rates associated to micro and meso-scale inertia effects can be analyzed by rate-independent constitutive theories as long as the material is discretized in all its phases [24]. However, in a homogeneous (macro-scale) representation of the material this part of the rate effects has to be explicitly modeled [25]; i.e.…”

Section: Rate-dependent Damage Modelmentioning

confidence: 99%

Simulation of dynamic behavior of quasi-brittle materials with new rate dependent damage model

Pereira

Weerheijm²,

Sluijs³

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract. In concrete often complex fracture and fragmentation patterns develop when subjected to high straining loads. The proper simulation of the dynamic cracking process in concrete is crucial for good predictions of the residual bearing capacity of structures in the risk of being exposed to extraordinary events like explosions, high velocity impacts or earthquakes.As it is well known, concrete is a highly rate dependent material. Experimental and numerical studies indicate that the evolution of damage is governed by complex phenomena taking place simultaneously at different material scales, i.e. micro, meso and macro-scales. Therefore, the constitutive law, and its rate dependency, must be adjusted to the level of representation. For a proper phenomenological (macroscopic) representation of the reality, the constitutive law has to explicitly describe all phenomena taking place at the lower material scales. Macro-scale inertia effects are implicitly simulated by the equation of motion.In the current paper, dynamic crack propagation and branching is studied with a new rate-dependent stress-based nonlocal damage model. The definition of rate in the constitutive law is changed to account for the inherent meso-scale structural inertia effects. This is accomplished by a new concept of effective rate which governs the dynamic delayed response of the material to variations of the deformation (strain) rate, usually described as micro-inertia effects. The proposed model realistically simulates dynamic crack propagation and crack branching phenomena in concrete.

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Influence of the meso-structure in dynamic fracture simulation of concrete under tensile loading

Cited by 117 publications

References 35 publications

Damage cluster distributions in numerical concrete at the mesoscale

Damage cluster distributions in numerical concrete at the mesoscale

Beam-particle approach to model cracking and energy dissipation in concrete: Identification strategy and validation

Simulation of dynamic behavior of quasi-brittle materials with new rate dependent damage model

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