A coupled discrete-continuum approach to simulate moisture effects on damage processes in porous materials

Roels, Staf; Moonen, Peter; Proft, K. De; Carmeliet, Jan

doi:10.1016/j.cma.2005.05.051

Cited by 25 publications

(15 citation statements)

References 16 publications

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“…Discrete fracture models, suited for macroscopic fractures or close-range modelling of cracks, allow taking into account detailed transport phenomena and moisture exchange between the porous medium and the fractures. Some methods allow simulating the effects of moisture on the evolution of crack opening and the mechanical behaviour of porous materials [Roels et al, 2006, Réthoré et al, 2007. However, such models require an exhaustive material description and mechanical characterization prior to flow simulations.…”

Section: Introductionmentioning

confidence: 99%

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

et al. 2012

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The study of moisture transfer inside building materials is an important issue in building physics. The hygric characterization of such materials has become a common practice for the estimation of the hygrothermal performance of buildings. However, their aging caused by mechanical loading and environmental factors inevitably affects their permeability to moisture ingress, and the knowledge of how this permeability is affected by damage and cracks is still incomplete.The effects of diffuse damage caused by mechanical loading on the water vapour permeability of fibre-reinforced mortar were studied. A full experimental setup is presented including observation of the porous structure, mechanical, and hygric characterization. Uniaxial tensile loading was applied on prismatic samples while their damage level was measured. Then, the moisture content of damaged and undamaged samples was monitored during variations of ambient relative humidity. Two numerical methods are presented and used for the comparison of the water vapour permeability of multiple samples presenting various levels of damage. By this methodology, diffuse damage caused by mechanical loading is shown to have an impact on the water vapour transfer inside the material.

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Section: Introductionmentioning

confidence: 99%

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

et al. 2012

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“…As the higher order of interpolation is used only locally, the order of integration does not seem to produce any stability problems related to the Babuska-Brezzi condition. Further comparison between this approach and literature is difficult since partially saturated conditions are considered [32,33]. Furthermore, results, such as mesh-dependency, is most prominent in lower stiffness cases.…”

Section: Discussionmentioning

confidence: 99%

“…Along the same lines, Roels et al [32] used the partition of unity method to simulate crack propagation in the solid part combined with a moisture transfer scheme. Results show that the solution for the fluid phase smoothed upon mesh refinement, since a fine mesh is needed to capture the steep change increase of capillary pressure field and corresponding decrease in permeability.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Mode I Crack Propagation in Saturated Ionized Porous Media Using Partition of Unity Finite Elements

Kraaijeveld¹,

Huyghe

Remmers³

et al. 2013

Journal of Applied Mechanics

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“…Cracks are explicitly modelled in the primary FE mesh, as opposed to staggered approaches [25,2,19,23] in which transport equations are solved separately in the fractures and in the porous medium. For such a fully coupled analysis, fracture elements can be double-nodded for a full account of transverse diffusion mechanisms through the interfaces [35].…”

Section: Flow In Fractured Porous Media 221 Fracture Integrationmentioning

confidence: 99%

Influence of concrete fracture on the rain infiltration and thermal performance of building facades

Rouchier

Woloszyn

Foray

et al. 2013

International Journal of Heat and Mass Transfer

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Postprint: Rouchier S., Woloszyn M., Foray G., Roux J.-J., 2013. Influence of concrete fracture on the rain infiltration and thermal performance of building facades, International Journal of Heat and Mass Transfer vol. 61, pp. 340-352. DOI: 10.1016/j.ijheatmasstransfer.2013.02.013 Abstract Water infiltration is known to play an important part in the degradation process of construction materials. Over time, microscopic and macroscopic cracks progressively develop under the effects of mechanical loading and sorption/desorption cycles: their influence is to be accounted for in long-term hygrothermal performance assessments of the building envelope. The present work aims at showing the potential consequences of cracking on the heat and moisture transfer across building facades, in order to justify the need for the identification of damage to prevent durability and thermal issues. Specific simulation cases of insulated and non-insulated building facades were defined, and submitted to atmospheric boundary conditions for simulation times of one month. Some of the simulation geometries included previous measurements of crack patterns in concrete. The comparison of fractured and non-fractured building facades showed the effects of cracks on the moisture accumulation and thermal performance of these wall configurations, thus giving an estimate of what these effects might be in real conditions. A methodology is thus proposed for the identification of renovation needs, which may be applied for the purpose of durability assessments as well.

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A coupled discrete-continuum approach to simulate moisture effects on damage processes in porous materials

Cited by 25 publications

References 16 publications

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

Two-Dimensional Mode I Crack Propagation in Saturated Ionized Porous Media Using Partition of Unity Finite Elements

Influence of concrete fracture on the rain infiltration and thermal performance of building facades

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