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Lattice discrete particle model for fiber - reinforced concrete.I / Edward A. Schauffert in Journal of engineering mechanics, Vol. 138 N° 7 (Juillet 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.826–833. Titre : Lattice discrete particle model for fiber - reinforced concrete.I : Theory Type de document : texte imprimé Auteurs : Edward A. Schauffert, Auteur ; Gianluca Cusatis, Auteur Année de publication : 2012 Article en page(s) : pp.826–833. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Concrete  Fiber  reinforcing  Particle  models  Lattice  models  Fracture  Strain  softening  Fiber  pull-out  Fiber  debonding Résumé : The lattice discrete particle model (LDPM) is a mesoscale model for heterogeneous materials. Developed for concrete, it simulates material mesostructure by modeling coarse aggregate particles and their surrounding mortar as polyhedral cells. A tetrahedralization of the particle centers generates a lattice framework where each lattice member is associated with a triangular-shaped plane of contact (facet) between two cells. Compatibility equations are formulated by describing the deformation of an assemblage of particles through rigid-body kinematics. Equilibrium equations are obtained through the force and moment equilibrium of each cell. The material behavior is assumed to be governed by a vectorial constitutive law imposed at the facets. A natural extension for this discrete model is to include the effect of dispersed fibers as discrete entities within the mesostructure. The LDPM incorporates this effect by modeling individual fibers randomly placed within the framework according to a given fiber volume fraction. The number and orientation of the fibers crossing each facet is computed and the contribution of each fiber to the facet response is formulated on the basis of a previously established micromechanical model for fiber-matrix interaction. The theory for the developed model, entitled the LDPM-F, is discussed herein. A subsequent companion paper will address model calibration and validation through the numerical simulation of experimental test results. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000387 [article] Lattice discrete particle model for fiber - reinforced concrete.I : Theory [texte imprimé] / Edward A. Schauffert, Auteur ; Gianluca Cusatis, Auteur . - 2012 . - pp.826–833. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.826–833. Mots-clés : Concrete  Fiber  reinforcing  Particle  models  Lattice  models  Fracture  Strain  softening  Fiber  pull-out  Fiber  debonding Résumé : The lattice discrete particle model (LDPM) is a mesoscale model for heterogeneous materials. Developed for concrete, it simulates material mesostructure by modeling coarse aggregate particles and their surrounding mortar as polyhedral cells. A tetrahedralization of the particle centers generates a lattice framework where each lattice member is associated with a triangular-shaped plane of contact (facet) between two cells. Compatibility equations are formulated by describing the deformation of an assemblage of particles through rigid-body kinematics. Equilibrium equations are obtained through the force and moment equilibrium of each cell. The material behavior is assumed to be governed by a vectorial constitutive law imposed at the facets. A natural extension for this discrete model is to include the effect of dispersed fibers as discrete entities within the mesostructure. The LDPM incorporates this effect by modeling individual fibers randomly placed within the framework according to a given fiber volume fraction. The number and orientation of the fibers crossing each facet is computed and the contribution of each fiber to the facet response is formulated on the basis of a previously established micromechanical model for fiber-matrix interaction. The theory for the developed model, entitled the LDPM-F, is discussed herein. A subsequent companion paper will address model calibration and validation through the numerical simulation of experimental test results. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000387

Lattice discrete particle model for fiber - reinforced concrete. II / Edward A. Schauffert in Journal of engineering mechanics, Vol. 138 N° 7 (Juillet 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.834–841. Titre : Lattice discrete particle model for fiber - reinforced concrete. II : Tensile fracture and multiaxial loading behavior Type de document : texte imprimé Auteurs : Edward A. Schauffert, Auteur ; Gianluca Cusatis, Auteur ; Daniele Pelessone, Auteur Année de publication : 2012 Article en page(s) : pp.834–841. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Concrete  Fiber  reinforcing  Numerical  models  Simulation  Lattice  models  Particle  models  Calibration  Validation  Fiber  pull-out  Fiber  debonding Résumé : In Part I of this two-part study, a theory is provided for the extension of the lattice discrete particle model (LDPM) to include fiber reinforcing capability. The resulting model, LDPM-F, is calibrated and validated in the present paper by comparing numerical simulations with experimental data gathered from the literature. The analyzed experiments include direct tension, confined and unconfined compression, and notched three-point bending tests. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000392 [article] Lattice discrete particle model for fiber - reinforced concrete. II : Tensile fracture and multiaxial loading behavior [texte imprimé] / Edward A. Schauffert, Auteur ; Gianluca Cusatis, Auteur ; Daniele Pelessone, Auteur . - 2012 . - pp.834–841. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.834–841. Mots-clés : Concrete  Fiber  reinforcing  Numerical  models  Simulation  Lattice  models  Particle  models  Calibration  Validation  Fiber  pull-out  Fiber  debonding Résumé : In Part I of this two-part study, a theory is provided for the extension of the lattice discrete particle model (LDPM) to include fiber reinforcing capability. The resulting model, LDPM-F, is calibrated and validated in the present paper by comparing numerical simulations with experimental data gathered from the literature. The analyzed experiments include direct tension, confined and unconfined compression, and notched three-point bending tests. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000392