Effect of transition zone on elastic moduli of concrete materials

Ramesh, G.; Sotelino, Elisa D.; Chen, W.F.

doi:10.1016/0008-8846(96)00016-6

Cited by 142 publications

(55 citation statements)

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“…For instance, Ramesh [24] and Yang [25] consider a average value for the Young modulus of the ITZ as a percentage value of the Young modulus for the matrix. In this section, a RVE containing one inclusion placed on the central region is analyzed, see Figure 15.…”

Section: Alternative Modeling Of the Itzmentioning

confidence: 99%

Evaluation of a proposed model for concrete at mesoscopic scale

Borges

Quaresma

Fernandes

et al. 2017

Rev. IBRACON Estrut. Mater.

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ResumoThis work deals with numerical modeling of mechanical behavior in quasi-brittle materials, such as concrete. For this propose, a two-dimensional meso-scale model based on RVE existence is presented. The material is considered as a three-phase material consisting of interface zone (ITZ), matrix and inclusions -each constituent modeled by an independent constitutive model. The Representative Volume Element (RVE) consists of inclusions idealized as circular shapes symmetrically and non-symmetrically placed into the specimen. The interface zone is modeled by means of cohesive contact finite elements. The inclusion is modeled as linear elastic and matrix region is considered as elastoplastic material. Our main goal here is to show a computational homogenization-based approach as an alternative to complex macroscopic constitutive models for the mechanical behavior of the brittle materials using a finite element procedure within a purely kinematical multi-scale framework. Besides, the fundamental importance of the representing dissipative phenomena in the interface zone to model the complex microstructural responses of materials like concrete is focused in this work. A set of numerical examples, involving the microcracking processes, is provided in order to illustrate the performance of the proposed modeling.Keywords: homogenization, quasi-brittle materials, cohesive contact finite element, concrete, plasticity.Este trabalho trata da modelagem numérica do comportamento mecânico em materiais quase-frágeis, tal como o concreto. Para este fim, um modelo 2D de escala mesoscópica baseado no conceito de Elemento de Volume Representativo (EVR) é apresentado. O material é considerado como composto por três fases consistindo de zona de interface, matriz e inclusões, onde cada constituinte é modelado independentemente. O EVR consiste de inclusões idealizadas como de forma circular dispostas de maneira simétrica e não simétrica. A zona de interface é modelada por meio de elementos finitos coesivos de contato. A inclusão é modelada como sendo um material elástico linear, já a matriz é considerada como material elastoplástico. Nosso principal objetivo é mostrar que uma formulação baseada na homogeneização computacional é uma alternativa aos modelos constitutivos macroscópicos complexos para o comportamento mecânico de matérias frágeis usando um procedimento baseado no Método dos Elementos Finitos no âmbito de uma teoria multi-escala. Além disso, o trabalho foca na fundamental importância em representar os fenômenos dissipativos na Zona de Transição para obter uma resposta microestrutural de um material complexo como o concreto. Uma série de exemplos envolvendo processos de microfissuração é apresentada de modo a ilustrar o desempenho da modelagem proposta.Palavras-chave: homogeneização, materiais quase-frágeis, elemento finito coesivo, concreto, plasticidade

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Section: Alternative Modeling Of the Itzmentioning

confidence: 99%

Evaluation of a proposed model for concrete at mesoscopic scale

Borges

Quaresma

Fernandes

et al. 2017

Rev. IBRACON Estrut. Mater.

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“…2). The elastic stiffness of the mortar and coarse aggregate are L 0 and L 1 . Homogeneous boundary condition in the external surface S of D is employed:  n (S) =  0 .n (1) where  0 is constant stress tensor, and n denotes the external normal to the external surface S. If the solid did not contain any inhomogeneity, the strain field would be  0 = L 0 -1 . 0 (2) The stress and strain in mortar differ from  0 and  0 by  and ~.…”

Section: Basic Formulationmentioning

confidence: 99%

“…ecently some researchers studied the elastic properties of concrete using the micromechanical model [1]. The interface zone is usually considered as a new elastic phase.…”

Section: Introductionmentioning

confidence: 99%

Concrete Failure Modeling Based on Micromechanical Approach Subjected to Static Loading

Wahyuni¹

2010

JTS

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AbstractIn this paper, a micromechanical model based on the Mori-Tanaka method and the spring-layer model is developed to study the stress-strain behavior of concrete. The concrete is modeled as a two-phase composite. And the failure of concrete is categorized as mortar failure and interface failure. The research presents a method for estimating the modulus of concrete under its whole loading process. The proposed micromechanical model owns the good capabilities for predicting the entire response of concrete under uniaxial compression. It is suitable that tensile strain is as the criterion of concrete failure and the prediction of crack direction also fits with experimental phenomenon.

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“…The effects of the ITZ on the elastic properties of composite materials have been addressed by many authors. For cementbased composites (Ramesh et al, 1996;Lutz and Zimmerman, 1996;Lutz et al, 1997;Li et al, 1999) and more recently Hashin and Monteiro (2002) proposed different linear upscaling schemes to calculate analytically the composite elastic properties and to determine the ITZ properties by inverse analysis. Garboczi and Berryman (2001) employed numerical techniques to predict the composite elastic properties for random microstructures with interfaces.…”

Section: Introductionmentioning

confidence: 99%