Modeling steel fiber reinforced concrete: numerical immersed boundary approach and a phenomenological mesomodel for concrete‐fiber interaction

Pros, Alba; Dı́ez, Pedro; Molins, Climent

doi:10.1002/nme.3312

Cited by 36 publications

(14 citation statements)

References 20 publications

(42 reference statements)

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“…To avoid the complexity of meshing fibre and concrete conformably, Pros et al [22] proposed a 2D meso-scale model preluding mesh matching between the two materials using immersed 5 boundary method. However, the constitutive model for the fibres in their study has to account for bond slip behaviour between the fibres and the concrete, which depends on angles between the fibre and normal direction of the failure pattern.…”

Section: Introductionmentioning

confidence: 99%

Meso-scale modelling of steel fibre reinforced concrete with high strength

Liang

2018

Construction and Building Materials

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Based on Delaunay triangulation, a 3D meso-scale model is successfully developed and verified. This approach modelling fibre and concrete separately and linking them with slide line contact has the capability to truly reflect the interfacial behaviour of fibre and mortar, and thus achieve high fidelity of numerical simulations. However, meso-scale modelling usually means tremendous complexity and long computational time. This paper proposes a model to achieve relatively high computation efficiency, as well as accuracy. Besides, the model has the potential to deal with small specimens cut from steel fibre reinforced concrete (SFRC) blocks.

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Section: Introductionmentioning

confidence: 99%

Meso-scale modelling of steel fibre reinforced concrete with high strength

Liang

2018

Construction and Building Materials

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“…Nevertheless, even in this case limitations for the study are evident since the numerical assessment of the scatter would require the 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 3 simulation of each fibre from the FRC and the analysis of thousands of models. Although important advances on the discrete simulation of the interaction fibre-matrix were achieved [13][14][15], the approach generally used leads to a long processing time that render the analysis of several models with different fibre distributions very difficult.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic scatter of FRC: an alternative philosophy to estimate characteristic values

Cavalaro

Aguado

2014

Mater Struct

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Abstract:The results from small scale laboratory tests of fibre reinforced concrete (FRC) usually show a high scatter. However, several studies indicate that the real scatter on the postcracking response of the material reduces considerably with the increase of the size of the elements tested. Such observations highlights a possible contradiction in the design of FRC since the characteristic values estimated from small scale tests might not be representative of large scale structures. This could penalize the material, leading to higher fibre consumption, less competitive solutions and problems in the quality control. The main objective of the present study is to address this fundamental issue. The aim is to evaluate the scatter that is intrinsic to the FRC and how it is affected by the size of the element, the type of concrete, the type and content of fibre. For that, a novel numerical approach is proposed for the simulation of the material and its variability. Then, an extensive parametric study is conducted with more than 35000 models, each one unique in terms of fibre distribution. Based on this analysis, equations are proposed to estimate the intrinsic scatter depending on several parameters. Finally, an alternative formulation is defined to estimate the characteristic value of the FRC considering the real structure in which it will be applied. The results derived from this study represent a contribution towards a more efficient design of structures and the reduction of the non-conformities in the quality control of the FRC. representative of large scale structures. This could penalize the material, leading to higher fibre consumption, less competitive solutions and problems in the quality control. The main objective of the present study is to address this fundamental issue. The aim is to evaluate the scatter that is intrinsic to the FRC and how it is affected by the size of the element, the type of concrete, the type and content of fibre. For that, a novel numerical approach is proposed for the simulation of the material and its variability. Then, an extensive parametric study is conducted with more than 35000 models, each one unique in terms of fibre distribution.Based on this analysis, equations are proposed to estimate the intrinsic scatter depending on several parameters.Finally, an alternative formulation is defined to estimate the characteristic value of the FRC considering the real structure in which it will be applied. The results derived from this study represent a contribution towards a more efficient design of structures and the reduction of the non-conformities in the quality control of the FRC.

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“…For this reason, fracture resistance of brittle structures signifies a critical safety criterion in engineering design. To minimize fracture‐induced failure, the introduction of inclusive material phases has drawn considerable attention in practice, in which fiber‐reinforced composite, concrete, and metal alloys are some typical examples …”

Section: Introductionmentioning

confidence: 99%

Level‐set topology optimization for maximizing fracture resistance of brittle materials using phase‐field fracture model

Fang

Zhou

et al. 2020

Numerical Meth Engineering

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Summary Fracture is one of the most common failure modes in brittle materials. It can drastically decrease material integrity and structural strength. To address this issue, we propose a level‐set (LS) based topology optimization procedure to optimize the distribution of reinforced inclusions within matrix materials subject to the volume constraint for maximizing structural resistance to fracture. A phase‐field fracture model is formulated herein to simulate crack initiation and propagation, in which a staggered algorithm is developed to solve such time‐dependent crack propagation problems. In line with diffusive damage of the phase‐field approach for fracture; topological derivatives, which provide gradient information for the topology optimization in a LS framework, are derived for fracture mechanics problems. A reaction‐diffusion equation is adopted to update the LS function within a finite element framework. This avoids the reinitialization by overcoming the limitation to time step with the Courant‐Friedrichs‐Lewy condition. In this article, three numerical examples, namely, a L‐shaped section, a rectangular slab with predefined cracks, and an all‐ceramic onlay dental bridge (namely, fixed partial denture), are presented to demonstrate the effectiveness of the proposed LS based topology optimization for enhancing fracture resistance of multimaterial composite structures in a phase‐field fracture context.

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Modeling steel fiber reinforced concrete: numerical immersed boundary approach and a phenomenological mesomodel for concrete‐fiber interaction

Cited by 36 publications

References 20 publications

Meso-scale modelling of steel fibre reinforced concrete with high strength

Meso-scale modelling of steel fibre reinforced concrete with high strength

Intrinsic scatter of FRC: an alternative philosophy to estimate characteristic values

Level‐set topology optimization for maximizing fracture resistance of brittle materials using phase‐field fracture model

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