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3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings

Concrete exhibits a complex mechanical behavior, especially when approaching failure. Its behavior is governed by the interaction of the heterogeneous structures of the material at the first level of observation below the homogeneous continuum, i.e., at the mesoscale. Concrete is assumed to be a thr...

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Detalles Bibliográficos
Autores principales: Forti, Tiago, Batistela, Gustavo, Forti, Nadia, Vianna, Nicolas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7602381/
https://www.ncbi.nlm.nih.gov/pubmed/33076310
http://dx.doi.org/10.3390/ma13204585
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author Forti, Tiago
Batistela, Gustavo
Forti, Nadia
Vianna, Nicolas
author_facet Forti, Tiago
Batistela, Gustavo
Forti, Nadia
Vianna, Nicolas
author_sort Forti, Tiago
collection PubMed
description Concrete exhibits a complex mechanical behavior, especially when approaching failure. Its behavior is governed by the interaction of the heterogeneous structures of the material at the first level of observation below the homogeneous continuum, i.e., at the mesoscale. Concrete is assumed to be a three-phase composite of coarse aggregates, mortar, and the interfacial transitional zone (ITZ) between them. Finite element modeling on a mesoscale requires appropriate meshes that discretize the three concrete components. As the weakest link in concrete, ITZ plays an important role. However, meshing ITZ is a challenging issue, due to its very reduced thickness. Representing ITZ with solid elements of such reduced size would produce very expensive finite element meshes. An alternative is to represent ITZ as zero-thickness interface elements. This work adopts interface elements for ITZ. Damage plasticity model is adopted to describe the softening behavior of mortar in compression, while cohesive fractures describe the cracking process. Numerical experiments are presented. First example deals with the estimation of concrete Young’s modulus. Experimental tests were performed to support the numerical test. A second experiment simulates a uniaxial compression test and last experiment simulates a uniaxial tensile test, where results are compared to data from the literature.
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spelling pubmed-76023812020-11-01 3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings Forti, Tiago Batistela, Gustavo Forti, Nadia Vianna, Nicolas Materials (Basel) Article Concrete exhibits a complex mechanical behavior, especially when approaching failure. Its behavior is governed by the interaction of the heterogeneous structures of the material at the first level of observation below the homogeneous continuum, i.e., at the mesoscale. Concrete is assumed to be a three-phase composite of coarse aggregates, mortar, and the interfacial transitional zone (ITZ) between them. Finite element modeling on a mesoscale requires appropriate meshes that discretize the three concrete components. As the weakest link in concrete, ITZ plays an important role. However, meshing ITZ is a challenging issue, due to its very reduced thickness. Representing ITZ with solid elements of such reduced size would produce very expensive finite element meshes. An alternative is to represent ITZ as zero-thickness interface elements. This work adopts interface elements for ITZ. Damage plasticity model is adopted to describe the softening behavior of mortar in compression, while cohesive fractures describe the cracking process. Numerical experiments are presented. First example deals with the estimation of concrete Young’s modulus. Experimental tests were performed to support the numerical test. A second experiment simulates a uniaxial compression test and last experiment simulates a uniaxial tensile test, where results are compared to data from the literature. MDPI 2020-10-15 /pmc/articles/PMC7602381/ /pubmed/33076310 http://dx.doi.org/10.3390/ma13204585 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Forti, Tiago
Batistela, Gustavo
Forti, Nadia
Vianna, Nicolas
3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings
title 3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings
title_full 3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings
title_fullStr 3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings
title_full_unstemmed 3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings
title_short 3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings
title_sort 3d mesoscale finite element modelling of concrete under uniaxial loadings
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7602381/
https://www.ncbi.nlm.nih.gov/pubmed/33076310
http://dx.doi.org/10.3390/ma13204585
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