The accurate analysis of cracking phenomena in the concrete structures has been a research topic of growing interest over the past few decades, with notable developments in the modeling techniques based on either smeared or discrete fracture approaches. The well-known cohesive zone models, belonging to discrete fracture approaches, are commonly judged as very effective for accurately representing the real crack pattern in quasi-brittle materials. The present work deals with comparing two different finite element-based cohesive fracture models: (i) a novel diffuse interface model, and (ii) an existing embedded crack model, based on an inter- and intra- element fracture approach, respectively. The first one relies on an intrinsic cohesive formulation by which the damage process inside the material is represented as a collection of imperfect interfaces randomly placed at the internal boundaries of a finite element mesh. The second one is based on a strong discontinuity approach according to which the crack is modeled as a discontinuity embedded into the displacement field of a standard continuum, allowing concrete cracking along nonprescribed paths to be correctly simulated. Cracking behavior in concrete specimens subjected to general loading conditions has been simulated by these two models and a detailed comparison between the numerical results is provided. Finally, a critical discussion regarding of computational efficiency and numerical accuracy highlights the efficacy of the newly proposed diffuse interface model.

Finite element analysis of concrete cracking: A comparative study between a diffuse interface model and an embedded crack model

de Maio U.;Greco F.
;
Leonetti L.;Nevone Blasi P.;Pranno A.
2021

Abstract

The accurate analysis of cracking phenomena in the concrete structures has been a research topic of growing interest over the past few decades, with notable developments in the modeling techniques based on either smeared or discrete fracture approaches. The well-known cohesive zone models, belonging to discrete fracture approaches, are commonly judged as very effective for accurately representing the real crack pattern in quasi-brittle materials. The present work deals with comparing two different finite element-based cohesive fracture models: (i) a novel diffuse interface model, and (ii) an existing embedded crack model, based on an inter- and intra- element fracture approach, respectively. The first one relies on an intrinsic cohesive formulation by which the damage process inside the material is represented as a collection of imperfect interfaces randomly placed at the internal boundaries of a finite element mesh. The second one is based on a strong discontinuity approach according to which the crack is modeled as a discontinuity embedded into the displacement field of a standard continuum, allowing concrete cracking along nonprescribed paths to be correctly simulated. Cracking behavior in concrete specimens subjected to general loading conditions has been simulated by these two models and a detailed comparison between the numerical results is provided. Finally, a critical discussion regarding of computational efficiency and numerical accuracy highlights the efficacy of the newly proposed diffuse interface model.
Cohesive fracture approach
Concrete cracking phenomena
Diffuse interface model
Embedded crack model
Quasi-brittle materials
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/327975
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