Modeling evolution of frost damage in fully saturated porous materials exposed to variable hygro-thermal conditions

Koniorczyk, Marcin; Gawin, Dariusz; Schrefler, Bernhard A.

doi:10.1016/j.cma.2015.08.015

Cited by 73 publications

(53 citation statements)

References 46 publications

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“…A study into the representative volume element size is conducted, and the framework is demonstrated by simulating the ageing process of a unidirectional specimen immersed in water. The influence of transient swelling stresses on microscopic failure is investigated, and failure envelopes of dry and saturated micromodels are compared.The combination of such effects makes a purely experimental characterisation of the hygrothermal ageing phenomenon a difficult task.A number of authors have therefore advocated numerical modelling in order to simulate the hygrothermal ageing process in polymers and composites [2,3,7,8] as well as in porous materials [9]. Because the mentioned degradation effects act on the microsopic material constituents, a micromechanics approach becomes a necessity.…”

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confidence: 99%

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A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites

Rocha

Meer

Nijssen

et al. 2017

Int. J. Numer. Meth. Engng

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In this work, a numerical framework for modelling of hygrothermal ageing in laminated composites is proposed. The model consists of a macroscopic diffusion analysis based on Fick's second law coupled with a multiscale FE 2 stress analysis in order to take microscopic degradation mechanisms into account. Macroscopic material points are modelled with a representative volume element with random fibre distribution. The resin is modelled as elasto-plastic with damage, and cohesive elements are included at the fibre/matrix interfaces. The model formulations and the calibration of the epoxy model using experimental results are presented in detail. A study into the representative volume element size is conducted, and the framework is demonstrated by simulating the ageing process of a unidirectional specimen immersed in water. The influence of transient swelling stresses on microscopic failure is investigated, and failure envelopes of dry and saturated micromodels are compared.The combination of such effects makes a purely experimental characterisation of the hygrothermal ageing phenomenon a difficult task.A number of authors have therefore advocated numerical modelling in order to simulate the hygrothermal ageing process in polymers and composites [2,3,7,8] as well as in porous materials [9]. Because the mentioned degradation effects act on the microsopic material constituents, a micromechanics approach becomes a necessity. However, it is also important to predict how such microscopic processes affect macroscopic material behaviour. Naya et al. [7] successfully used micromechanics to predict the wet properties of a unidirectional ply by fitting a mesoscale failure criterion, although the swelling phenomenon was not considered. Such a numerical homogenisation approach entails a one-way upscaling procedure after which the microscopically obtained failure envelope can be used in mesolevel analysis.However, macroscopic phenomena such as transient swelling stresses during diffusion [10] may also influence the resultant microscopic degradation processes. Joliff et al.[3] simulated the immersion of a macroscopic specimen including diffusion and differential swelling by explicitly meshing its complete microstructure. The authors demonstrated the importance of including differential swelling in the ageing model, although material failure and degradation (plasticisation and interface weakening) were not included. However, such a DNS approach becomes computationally infeasible if an iterative failure analysis is performed at the same time.In order to simultaneously account for macroscopic transient phenomena and microscopic failure mechanisms, a concurrent multiscale approach can be chosen by solving finite element problems at both macroscale and microscale and coupling them through homogenisation by means of a so-called FE 2 approach [11]. A large body of literature is dedicated to the treatment of pure stress analysis in FE 2 [12,13], including consistent treatment of material failure across scales [14] and modelling of processes...

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confidence: 99%

“…A number of authors have therefore advocated numerical modelling in order to simulate the hygrothermal ageing process in polymers and composites [2,3,7,8] as well as in porous materials [9]. Because the mentioned degradation effects act on the microsopic material constituents, a micromechanics approach becomes a necessity.…”

mentioning

confidence: 99%

A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites

Rocha

Meer

Nijssen

et al. 2017

Int. J. Numer. Meth. Engng

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“…The continuum damage implemented in the matrix is characterized by a damage variable that has a value between 0 and 1 which signify undamaged and completely damaged states respectively. Assuming isotropic stiffness degradation, is defined as per Equation 3 [22][23][24][25]61].…”

Section: Numerical Simulation Of Isotropic Damage In Matrix Induced Bmentioning

confidence: 99%

“…To have a deeper insight into the material degradation and resulting accelerated chloride ingress, the heterogeneity of the concrete is encompassed in this study by a microstructure-guided analysis at the meso and micro scales. While continuum damage mechanics is used to quantify the progressive material degradation with freeze thaw cycles [22][23][24][25], Fick's law of diffusion [26][27][28] is used to capture the resulting accelerated chloride diffusion behavior in the degraded concrete.…”

Section: Introductionmentioning

confidence: 99%

Influence of microencapsulated phase change materials (PCMs) on the chloride ion diffusivity of concretes exposed to Freeze-thaw cycles: Insights from multiscale numerical simulations

Nayak

Lyngdoh

Das

2019

Construction and Building Materials

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Use of phase change materials (PCMs) to tailor the thermal performance of concretes by efficient energy storage and transmission has gained traction in recent years. This study incorporates microencapsulated PCMs as sand-replacement in concrete bridge decks and performs numerical simulation involving multiple interactive length scales to elucidate the influence of PCM-incorporation in concretes subjected to combined freeze-thaw and chloride ingress-induced deterioration. The simulations show significant increase in durability against combined freeze-thaw and chloride ingress-induced deterioration in concretes when microencapsulated PCMs are incorporated. In addition, a reliability-based probabilistic analysis shows significant increase in life expectancy of bridge decks with PCM-incorporation. The numerical approach presented here provides efficient means to develop design strategies to tune dosage and transition temperature of PCMs to maximize durability of concrete structures in regions that experience significant winter weather conditions.

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“…Thus, the optimum parameters chosen for binder composition are specific surface area of 550 m 2 /kg, the particle size of 0.15-500 microns, and average particle diameter of the grains of 0.65-11.2 mm [33,34].…”

Section: Experimental Partmentioning

confidence: 99%

Mechanical Properties of Fiber-Reinforced Concrete Using Composite Binders

Fediuk

Smoliakov

Muraviov

2017

Advances in Materials Science and Engineering

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This paper investigates the creation of high-density impermeable concrete. The effect of the "cement, fly ash, and limestone" composite binders obtained by joint grinding with superplasticizer in the varioplanetary mill on the process of structure formation was studied. Compaction of structure on micro-and nanoscale levels was characterized by different techniques: X-ray diffraction, DTA-TGA, and electron microscopy. Results showed that the grinding of active mineral supplements allows crystallization centers to be created by ash particles as a result of the binding of Ca(OH) 2 during hardening alite, which intensifies the clinker minerals hydration process; the presence of fine grains limestone also leads to the hydrocarboaluminates calcium formation. The relation between cement stone neoplasms composition as well as fibrous concrete porosity and permeability of composite at nanoscale level for use of composite binders with polydispersed mineral supplements was revealed. The results are of potential importance in developing the wide range of fine-grained fiber-reinforced concrete with a compressive strength more than 100 MPa, with low permeability under actual operating conditions.

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Modeling evolution of frost damage in fully saturated porous materials exposed to variable hygro-thermal conditions

Cited by 73 publications

References 46 publications

A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites

A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites

Influence of microencapsulated phase change materials (PCMs) on the chloride ion diffusivity of concretes exposed to Freeze-thaw cycles: Insights from multiscale numerical simulations

Mechanical Properties of Fiber-Reinforced Concrete Using Composite Binders

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