Numerical determination of the tensile response and the dissipated fracture energy of concrete: role of the mesostructure and influence of the loading rate

Gatuingt, Fabrice; Snozzi, Léonardo; Molinari, Jean‐François

doi:10.1002/nag.2181

Cited by 35 publications

(21 citation statements)

References 42 publications

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“…I e0þ is thus calculated by setting 0 as the ''strongest'' stress (i.e., the lowest in absolute value terms) of the three principal stresses. From these equations, d can be calculated according to a classical approach using (15). To analyze the model response within the EA domain, a cylindrical specimen subjected to a vertical compression r 1 and confinement r 2 ¼ r 3 will be considered (see Fig.…”

Section: Low and Moderate Confinementmentioning

confidence: 99%

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A new 3D damage model for concrete under monotonic, cyclic and dynamic loadings

2014

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Among the ''theories'' applied to model concrete behavior, damage mechanics has proven to be efficient. One of the first models for concrete introduced into such a framework is Mazars' damage model. A new formulation of this model, called the ''l model'' and based on a coupling of elasticity and damage within an isotropic formulation, is proposed herein for the purpose of 3D cyclic and dynamic loadings. Unilateral behavior (i.e., crack opening and closure) is introduced by use of two internal variables. A threshold surface is then associated with each of these variables. The shape of such surfaces has been chosen to model as accurately as possible concrete behavior under various loadings, i.e., tension, compression, shear, biaxial and triaxial, in the aim of simulating a large number of loading types (monotonic, cyclic, seismic, blast, impact, etc.). Applications of this model are presented on plain or reinforced concrete elements subjected to a range of loadings (e.g., multiaxial, cyclic, dynamic). A comparison with experimental results serves to demonstrate the effectiveness of these various selected options.

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Section: Low and Moderate Confinementmentioning

confidence: 99%

“…Some models provide a description of the cyclic behavior (la Borderie et al [11], Halm et al [12], Richard et al [13]). Very few models however are capable of simulating loading with both confinement and strain rate effects (Pontiroli et al [14], Gatuingt et al [15]), though their use often remains complex.…”

Section: Introductionmentioning

confidence: 99%

A new 3D damage model for concrete under monotonic, cyclic and dynamic loadings

2014

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“…A first family is represented by lattice models (for instance [42,4]), where the continuum is replaced by a system of discrete particles and the mechanical properties of the lattice beams aim to represent the concrete mesostructure [26,24,23,13]. The second class resorts to the finite-element approach, in which concrete is usually represented as a biphasic material, made of a mixture of aggregates embedded in a matrix phase with an interfacial transition zone (ITZ) between them [38,47,10,29,9,6,44,22].…”

Section: Introductionmentioning

confidence: 99%

A meso-mechanical model for concrete under dynamic tensile and compressive loading

2012

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We present a computational model, which combines interface debonding and frictional contact, in order to investigate the response of concrete specimens subjected to dynamic tensile and compressive loading. Concrete is modeled using a meso-mechanical approach in which aggregates and mortar are represented explicitly, thus allowing all material parameters to be physically identified. The material phases are considered to behave elastically up to failure and the initiation, coalescence and propagation of cracks are modeled by dynamically inserted cohesive elements. The impenetrability condition is enforced by a contact algorithm that resorts to the classical law of Coulomb friction. We show that the proposed model is able to capture the general increase in strength with increasing rate of loading and the tension/compression asymmetry. Moreover, we simulate compression with lateral confinement showing that the model reproduces the increase in peak strength with increasing confinement level. We also quantify the increase in the ratio between dissipated frictional energy and dissipated fracture energy as the confining pressure is augmented. Our results demonstrate the fundamental importance of capturing frictional mechanisms, which appear to dissipate substantially more energy than cracking under compressive loading.

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“…Depletion activities during hydrocarbon extraction may result in inelastic compaction that gives rise to ground surface subsidence, borehole instability, or triggered seismicity. Carbon sequestration, hydraulic fracturing applied to geothermal reservoirs and shale gas production, and numerous enhanced hydrocarbon recovery methods that rely on injecting fluids at elevated pressure may induce seismicity, brittle fractures, and faults , .…”

Section: Introductionmentioning

confidence: 99%

On the pore-scale mechanisms leading to brittle and ductile deformation behavior of crystalline rocks

Tjioe

Borja

2015

Int. J. Numer. Anal. Meth. Geomech.

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SUMMARYDeformation mechanisms at the pore scale are responsible for producing large strains in porous rocks. They include cataclastic flow, dislocation creep, dynamic recrystallization, diffusive mass transfer, and grain boundary sliding, among others. In this paper, we focus on two dominant pore-scale mechanisms resulting from purely mechanical, isothermal loading: crystal plasticity and microfracturing. We examine the contributions of each mechanism to the overall behavior at a scale larger than the grains but smaller than the specimen, which is commonly referred to as the mesoscale. Crystal plasticity is assumed to occur as dislocations along the many crystallographic slip planes, whereas microfracturing entails slip and frictional sliding on microcracks. It is observed that under combined shear and tensile loading, microfracturing generates a softer response compared with crystal plasticity alone, which is attributed to slip weakening where the shear stress drops to a residual level determined by the frictional strength. For compressive loading, however, microfracturing produces a stiffer response than crystal plasticity because of the presence of frictional resistance on the slip surface. Behaviors under tensile, compressive, and shear loading invariably show that porosity plays a critical role in the initiation of the deformation mechanisms. Both crystal plasticity and microfracturing are observed to initiate at the peripheries of the pores, consistent with results of experimental studies.

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Numerical determination of the tensile response and the dissipated fracture energy of concrete: role of the mesostructure and influence of the loading rate

Cited by 35 publications

References 42 publications

A new 3D damage model for concrete under monotonic, cyclic and dynamic loadings

A new 3D damage model for concrete under monotonic, cyclic and dynamic loadings

A meso-mechanical model for concrete under dynamic tensile and compressive loading

On the pore-scale mechanisms leading to brittle and ductile deformation behavior of crystalline rocks

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