Hydrolytic ageing of syntactic foams for thermal insulation in deep water: degradation mechanisms and water uptake model

Sauvant-Moynot, Valérie; Gimenez, Nelly; Sautereau, H.

doi:10.1007/s10853-006-7618-0

Cited by 55 publications

(34 citation statements)

References 12 publications

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“…According to previous studies [7,8,12,13], the long term water uptake of syntactic foam immersed in sea or tap water cannot be modelled by a Fickian law when the temperature is above 40°C. Since water uptake in syntactic foams is linked to the hydration of all components (polymer, glass, interfaces and void), there is a wide range of water uptake curves for these materials.…”

Section: Mechanisms Of Water Uptake In Syntactic Foamsmentioning

confidence: 99%

“…In addition to plasticisation, the presence of water in the microstructure can induce several chemical and physical modifications (hydrolysis, lixiviation, swelling, etc.). In this paper, we will not focus on the description of these mechanisms but an overview can be found in [12,13]. Other studies also focused on the effect of hydrostatic pressure on water ingress, specially in syntactic foams [14,15].…”

Section: Mechanisms Of Water Uptake In Syntactic Foamsmentioning

confidence: 99%

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Durability of Syntactic Foams for Deep Offshore Insulation: Modelling of Water Uptake under Representative Ageing Conditions in Order to Predict the Evolution of Buoyancy and Thermal Conductivity

Lefebvre

Sauvant-Moynot

Choqueuse

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Durabilité de mousses syntactiques utilisées en offshore profond : modélisation de la prise en eau des matériaux lors de vieillissements représentatifs et prévision de la flottabilité et de la conductivité thermique à long terme -Des vieillissements en pression (de 1 bar à 300 bar) et en température (de 4°C à 130°C) ont été réalisés sur trois sortes de mousses syntactiques plongées dans de l'eau de mer en renouvellement. Certaines propriétés fonctionnelles des matériaux ont été suivies au cours des vieillissements. En particulier, pour chaque mousse syntactique et pour tous les vieillissements, l'effet de la prise en eau sur la flottabilité et sur la conductivité thermique a été mesuré. Un modèle par éléments finis permettant de calculer la prise en eau de mousses syntactiques a ensuite été développé. Ce modèle est basé sur la description de trois mécanismes d'hydratation, chaque mécanisme étant relié à une partie de la microstructure de la mousse syntactique. L'identification des paramètres sur la base de données donne de bons résultats quelles que soient les conditions de vieillissement et la dimension des échantillons. Finalement, le modèle ainsi identifié a été utilisé pour simuler l'évolution de propriétés fonctionnelles que présenterait une structure immergée en conditions réelles pendant 20 ans. Ce calcul nous permet en outre d'estimer l'épaisseur du matériau isolant affectée par la pénétration de l'eau, valeur que nous pouvons alors utiliser au moment du design en tant qu'épaisseur sacrificielle. Abstract -Durability of Syntactic Foams for Deep Offshore Insulation: Modelling of Water Uptake under Representative Ageing Conditions in Order to Predict the Evolution of Buoyancy and Thermal

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Section: Mechanisms Of Water Uptake In Syntactic Foamsmentioning

confidence: 99%

Section: Mechanisms Of Water Uptake In Syntactic Foamsmentioning

confidence: 99%

Durability of Syntactic Foams for Deep Offshore Insulation: Modelling of Water Uptake under Representative Ageing Conditions in Order to Predict the Evolution of Buoyancy and Thermal Conductivity

Lefebvre

Sauvant-Moynot

Choqueuse

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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“…In order to overcome that problem, a class of closed cell foams known as syntactic foams were introduced by dispersing rigid hollow particles in a matrix material. These foams have been widely used in structural applications [4][5][6][7] since the late 1960's and early 1970's [8]. Syntactic foams can be classified as closed pore foams, since the porosity in these materials exists in the form of discrete hollow particles.…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of epoxy syntactic foam filled with epoxy hollow spheres

Samsudin¹,

Ariff²,

Zakaria³

et al. 2011

Express Polym. Lett.

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Abstract. The present study focuses on the development and characterization of epoxy syntactic foam filled with epoxy hollow spheres (ESF/EHoS). The epoxy syntactic foam (ESF) was produced by embedding epoxy hollow spheres (EHoS) into a mixture of epoxy-hardener and 3% KOH solution. An innovative approach and simple procedure was implemented in the preparation of the EHoS where expanded polystyrene (EPS) beads were used as initiation material. The EPS beads were coated with the epoxy resin and these coated EPS beads were later cured and post-cured at high temperature which will also shrink the EPS beads thus producing a hollow structure. The physical and compressive properties of the developed ESF were characterized. The progressive collapse of the syntactic foam was monitored in real-time with respect to percentage of strain during a compression test. Results also indicated that the (ESF/EHoS) showed similar deformation pattern with other types of syntactic foams which exhibited the common three regions of deformations.

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“…Selection of constituent materials, particle volume fraction, and particle wall thickness allows for tailoring the composite properties (see for example Gupta et al, 2010;Islam and Kim, 2007;John et al, 2007). The presence of porosity enclosed inside thin inclusions improves dimensional stability by providing low moisture absorption and thermal expansion (see for example Rohatgi et al, 2006;Sauvant-Moynot et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Elastic interaction of interfacial spherical-cap cracks in hollow particle filled composites

Tagliavia

Porfiri

Gupta

2011

International Journal of Solids and Structures

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a b s t r a c tThis work analyzes the elastic interaction between two spherical-cap cracks present along the outer surface of a hollow particle embedded in a dissimilar medium under remote uniaxial tensile loading. A semi-analytical approach based on an enriched Galerkin method is adopted to determine stress and deformation fields as functions of particle wall thickness and cracks' configuration. The present analysis is limited to multiple interfacial spherical-cap cracks; that is, crack propagation is restrained to the particle-matrix interface and possibility of crack kinking in the matrix is not considered. Interfacial crack growth characteristics, conditions for stable crack propagation, equal crack growth, and shielding are established through energy release rate analysis. The study is relevant to the analysis of tensile and flexural failure of syntactic foams used in marine and aerospace applications. Results specialized to glass-vinyl ester syntactic foams demonstrate that particle wall thickness can be used to control crack stability and growth characteristics as well as tailoring the magnitude of the shielding phenomenon.Predictions are compared to finite element findings for validation and to results for penny-shaped cracks to elucidate the role of crack curvature.

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Hydrolytic ageing of syntactic foams for thermal insulation in deep water: degradation mechanisms and water uptake model

Cited by 55 publications

References 12 publications

Durability of Syntactic Foams for Deep Offshore Insulation: Modelling of Water Uptake under Representative Ageing Conditions in Order to Predict the Evolution of Buoyancy and Thermal Conductivity

Durability of Syntactic Foams for Deep Offshore Insulation: Modelling of Water Uptake under Representative Ageing Conditions in Order to Predict the Evolution of Buoyancy and Thermal Conductivity

Development and characterization of epoxy syntactic foam filled with epoxy hollow spheres

Elastic interaction of interfacial spherical-cap cracks in hollow particle filled composites

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