Analytical and numerical comparison of discrete damage models with induced anisotropy

Benelfellah, Abdelkibir; Frachon, Arnaud; Gratton, Michel; Caliez, Michaël; Picart, Didier

doi:10.1016/j.engfracmech.2014.03.022

Cited by 6 publications

(8 citation statements)

References 17 publications

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“…With this formulation, the crack growth rate c depends only on the deviatoric stress and therefore is pressure-independent, unlike in the SCRAM model (previous equations (8) and (9)).…”

Section: Viscoscram Model (Vs)mentioning

confidence: 99%

“…Zubelevicz et al (2013) have introduced different damage rates in tension and compression coupled with viscoplasticity. Lastly, a microplane model with anisotropic damage added to non-associated plasticity with isotropic hardening was proposed by Benelfellah et al (Benelfellah, 2013;Benelfellah et al, 2014Benelfellah et al, , 2017Picart et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quasistatic mechanical behavior of HMX- and TATB-based plastic-bonded explosives

Plassart

Picart

Gratton

et al. 2020

Mechanics of Materials

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“…With this formulation, the crack growth rate c depends only on the deviatoric stress and therefore is pressure-independent, unlike in the SCRAM model (previous equations (8) and (9)).…”

Section: Viscoscram Model (Vs)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasistatic mechanical behavior of HMX- and TATB-based plastic-bonded explosives

Plassart

Picart

Gratton

et al. 2020

Mechanics of Materials

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“…The consequences of opening / closing of microcracks on the effect of damage are introduced into the free energy of each microplane using effectiveness functions denoted , and [6]. The free energy for a given microplane is thus expressed:…”

Section: Figure 1 : Vdt Decomposition [11]mentioning

confidence: 99%

“…We choose here a microplane formalism introduced in 1938 (Taylor [16]) and first applied to metal plasticity (Batdorf Budianski [1] [13]. A detailed comparison of the main classes of those models is presented by Benelfellah et al [6]. Microplane models consider that each direction of the solid angle chosen fixed, orients a microplane with its associated behavior.…”

Section: Introductionmentioning

confidence: 99%

VDT microplane model with anisotropic effectiveness and plasticity

Benelfellah¹,

Gratton²,

Caliez³

et al. 2017

Mechanics & Industry

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L'état de l'ouverture et de la fermeture des microfissures est un phénomène cinématique généralement modélisé à l'aide de variables d'effectivité de l'endommagement, qui conduit à une élasticité différente pour un même niveau de dommage. Dans ce travail, le modèle microplan avec une décomposition Volumétrique, Déviatorique et Tangentiel (VDT), est sélectionné et modifié en introduisant l'effet d'ouverture-fermeture des microfissures dans l'énergie libre. Une loi d'évolution de l'endommagement est écrite pour mieux prendre en compte l'influence de la pression sur l'endommagement. Afin de mieux illustrer les mécanismes introduits dans le modèle, des rosettes de dommage pour un niveau de déformation donné sont présentées. Le modèle est validé en comparant les simulations aux résultats expérimentaux pour des essais monotones et cycliques de traction et compression avec différents niveaux de confinement. Abstract:The opening-closing state of the microcracks is a kinematic phenomenon usually modeled using a set of damage effectiveness variables, which results in different elastic responses for the same damage level. In this work, the microplane model with volumetric, deviatoric and tangential decomposition denoted V-D-T is modified. The influence of the confining pressure is taken into account in the damage variables evolution laws. For a better understanding of the mechanisms introduced into the model, the damage rosettes are presented for a strain given level. The model is confirmed through comparisons of the simulations with the experimental results of monotonic, and cyclic tensile and compressive testing with different levels of confining pressure.

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“…Extensive researches are conducted for further understanding the influence of discontinuous defects. Most of them [4,5] assume that the defected rockmass is isotropic and homogeneous. However, engineering applications have proved that this assumption is not always reasonable.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Anisotropy and Scale Effects on the Strength Characteristics of Defected Rockmass

Liu

Wang

2020

Advances in Civil Engineering

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Discontinuous defect in the rockmass is a key influential factor in controlling the strength behavior, and how to estimate the anisotropic strength and scale effect on the defected rockmass is the remaining challenging focus in engineering application. In the present study, intact tuff samples cored from the Xiabeishan tunnel engineering in situ are conducted by experiment tests (i.e., uniaxial compression test, triaxial compression test, and Brazilian tensile test) to obtain the corresponding mechanical parameters. Results from the numerical simulations using the particle flow code (PFC) by the flat-jointed model (FJM) are performed to match the macroparameters from experimental results. It is observed that numerical results have good agreement with the macroscopic mechanical parameters of intact samples including UCS, BTS, triaxial compression strength, and corresponding deformation parameters. Finally, a series of uniaxial and confining compression tests are conducted by using a synthetic rockmass (SRM) method which is coupled with the discrete element method (DEM) and discrete fracture network (DFN). Then, the anisotropy and scale effects on the strength characteristics of the defected rockmass are investigated. The results show that defects have a vital effect on the failure mode and strength behavior of the rockmass in the research region. The strength parameters are changed with the specimen size. The REV size of the considered defected rockmass is regarded as 5 × 10 m, and this size is also influenced by the confinement level. The anisotropy of macroscopic strength parameters is found in the considered defected rockmass, whose stress-strain curves and failure modes are also discussed.

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Analytical and numerical comparison of discrete damage models with induced anisotropy

Cited by 6 publications

References 17 publications

Quasistatic mechanical behavior of HMX- and TATB-based plastic-bonded explosives

Quasistatic mechanical behavior of HMX- and TATB-based plastic-bonded explosives

VDT microplane model with anisotropic effectiveness and plasticity

Numerical Analysis of the Anisotropy and Scale Effects on the Strength Characteristics of Defected Rockmass

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