Thermal Conductivity of Phenolic-Carbon Chars

Clayton, W. A.; Fabish, T. J.; Lagedrost, J. F.

doi:10.21236/ad0702112

Cited by 14 publications

(20 citation statements)

References 3 publications

(3 reference statements)

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“…Conversely, the exponential recovery trend on λ rtt was unexpected. Hind and Robitaille 8 reported broadly exponential trends from Clayton’s model 10 applied to composites. No analytical or semi-empirical models of the through-thickness thermal conductivity of textiles were found in the literature, hence this was probed.…”

Section: Discussionmentioning

confidence: 99%

“…where λ fa is the thermal conductivity of the fibres in the axial direction and λ m is the thermal conductivity of the matrix; the longitudinal in-plane thermal conductivity is a linear function of fibre volume fraction ( V f ). 8,9 Clayton’s analytical model (2) is widely used for predicting the transverse thermal conductivity of unidirectional fibre-reinforced composites from the thermal conductivity of the fibres in the transverse direction λ ft 8,10 yielding a mild exponential trend as a function of V f . 9 Clayton’s model may also be used for predicting the through-thickness thermal conductivity λ ctt of laminates manufactured from unidirectional plies as this is equal to the transverse conductivity of a single ply.…”

Section: Introductionmentioning

confidence: 99%

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Thermal conductivity of textile reinforcements for composites

El-Hage

Hind

Robitaille

2018

Journal of Textiles and Fibrous Materials

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Thermal conductivity data for dry carbon fibre fabrics are required for modelling heat transfer during composites manufacturing processes; however, very few published data are available. This article reports in-plane and throughthickness thermal conductivities measured as a function of fibre volume fraction (V f) for non-crimp and twill carbon reinforcement fabrics, three-dimensional weaves and reinforcement stacks assembled with one-sided carbon stitch. Composites made from these reinforcements and glass fibre fabrics are also measured. Clear trends are observed and the effects of V f , de-bulking and vacuum are quantified along with orthotropy ratios. Limited differences between the conductivity of dry glass and carbon fibre fabrics in the through-thickness direction are reported. An unexpected trend in the relationship between that quantity and V f is explained summarily through simple simulations.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of textile reinforcements for composites

El-Hage

Hind

Robitaille

2018

Journal of Textiles and Fibrous Materials

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“…This equation was developed by Lord Rayleigh to estimate λ in composites reinforced with multiple kinds of fibers aligned in the direction normal to the heat flow. [ 55,56 ] The subindex “ f i ” indicates the “ i ” nth kind of fiber in the composite. The subsrits “ c ” and “ m ” correspond to composite and matrix, respectively.

\frac{λ_{c}}{λ_{m}} goodbreak= 1 goodbreak- 2 \sum_{f_{i}} υ_{f_{i}} {(\frac{1 + \frac{λ_{f_{i}}}{λ_{m}}}{1 - \frac{λ_{f_{i}}}{λ_{m}}} + \frac{ν_{f_{i}} - 0.3058 {ν_{f_{i}}}^{4}}{\frac{1 + \frac{true}{λ_{f_{i}}}}{1 - \frac{true}{λ_{f_{i}}}}} - \frac{0.135 {ν_{f_{i}}}^{8}}{\frac{1 + \frac{true}{λ_{f_{i}}}}{1 - \frac{true}{λ_{f_{i}}}}})}^{- 1}

…”

Section: Methodsmentioning

confidence: 99%

Investigating the use of natural hollow fibers from common milkweed to improve the mechanical and thermal properties of epoxy resin

Sanchez-Diaz

Ouellet²,

Elkoun

et al. 2023

Polymer Composites

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Milkweed floss was used as a reinforcement to develop lightweight epoxy composites with enhanced thermal insulating properties. Seed fibers from Asclepias Syriaca harvested in Quebec were used for this study. Some fibers were treated with acetone to remove their protective hydrophobic coating.Epoxy resin was blended with 15% w/w of native or acetone-treated milkweed floss to form prepregs. The prepregs were casted into molds, degassed, and compressed to produce the composites. The composites were passed through a post-curing phase before characterization. The composites and the epoxy resin alone were characterized to determine their density, porosity, thermal conductivity, thermal degradation, mechanical resistance, and thermo-mechanical behavior. The composites reinforced with native or acetone-treated milkweed floss were 7.4% and 10.3% lighter than the epoxy resin, respectively. The specific elastic modulus of the resin increased by 9.6% and 20.1% with the addition of native or acetone-treated fibers, respectively. The thermal conductivity of the epoxi decreased by 7.8% and 15.6% with the use of native or acetonetreated milkweed floss, respectively. Due to their low weight and reduced thermal conductivity, the milkweed-reinforced epoxy composites may find applications in the production of structural and insulating elements for vehicles and buildings.

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“…7c and 7d, as they cannot be exactly replicated as a linear combination of parameters. The woven composites studied can be approximated fairly accurately with closed form models arising from theory [40].…”

Section: Sl Analytical Studymentioning

confidence: 99%

Assessing Parameterized Geometric Models of Woven Composites using Image-Based Simulations

W.¹,

Collins²,

Panerai³

et al. 2023

Preprint

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Mesoscale simulations of woven composites using parameterized analytical geometries offer a way to connect constituent material properties and their geometric arrangement to effective composite properties and performance. However, the reality of as-manufactured materials often differs from the ideal, both in terms of tow geometry and manufacturing heterogeneity. As such, resultant composite properties may differ from analytical predictions and exhibit significant local variations within a material.We employ mesoscale finite element method simulations to compare idealized analytical and as-manufactured woven composite materials and study the sensitivity of their effective properties to the mesoscale geometry. Three-dimensional geometries are reconstructed from X-ray computed tomography, image segmentation is performed using deep learning methods, and local fiber orientation is obtained using the structure tensor calculated from image scans. Suitable approximations to composite properties, using analytical unit cell calculations and effective media theory, are assessed. Our findings show that an analytical geometry and sub-unit cell geometry provide reasonable predictions for the effective thermal properties of a multi-layer production composite.

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Thermal Conductivity of Phenolic-Carbon Chars

Cited by 14 publications

References 3 publications

Thermal conductivity of textile reinforcements for composites

Thermal conductivity of textile reinforcements for composites

Investigating the use of natural hollow fibers from common milkweed to improve the mechanical and thermal properties of epoxy resin

Assessing Parameterized Geometric Models of Woven Composites using Image-Based Simulations

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