Measurement of three-dimensional permeability

Weitzenböck, Jan; Shenoi, R.A.; Wilson, P.A.

doi:10.1016/s1359-835x(97)00049-3

Cited by 80 publications

(43 citation statements)

References 9 publications

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“…[Pa·s] the fluid viscosity of the injected fluid and the term "p/"x [Pa/m] expresses the pressure drop to a specific flow length. Three different kinds of experimental methods of permeability measurements are wellknown: 1D flow [13][14][15][16], 2D flow [13,17,18] and 3D flow [19][20][21][22]. Nowadays no defined standard requirements for permeability measurements and calculation procedures are available [23][24][25].…”

mentioning

confidence: 99%

An evaluation of the reproducibility of capacitive sensor based in-plane permeability measurements: A benchmarking study

Grössing

Becker²,

Kaufmann³

et al. 2015

Express Polym. Lett.

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mentioning

confidence: 99%

An evaluation of the reproducibility of capacitive sensor based in-plane permeability measurements: A benchmarking study

Grössing

Becker²,

Kaufmann³

et al. 2015

Express Polym. Lett.

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“…However, in practice, the flow close to the inlet is hemispherical; an approach to compensate for this discrepancy is to assume that z 0 R 0 [3], or that z 0 R 0 /10 [2,6], where R 0 is the inlet radius. An alternative is the usage of an additional transformation (Eq.…”

Section: Modeling Considerationsmentioning

confidence: 99%

“…In systems built specifically to detect the unsaturated permeability, sensors that detect the flow advancement are essential but are the source of yet another uncertainty; their performance and efficiency in flow front detection is bound to define the quality of the permeability calculation. When in the past the transverse flow front was detected by material-embedded sensors [2][3][4] (e.g., thermistors, optical fibers, or SMARTweave TM ), the flow was affected by the sensors in a degree proportional to their diameter and orientation [5] while only spatially discrete measurements could be achieved. Electrical resistance point sensors that invade only the tool and not the material can only provide fluid arrival information at the cavity transverse boundaries and therefore a model is needed for intermediate transverse positions [6].…”

Section: Introductionmentioning

confidence: 99%

Determination of the unsaturated through‐thickness permeability of fibrous preforms based on flow front detection by ultrasound

et al. 2016

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The permeability of fibrous preforms used as reinforcements for fiber‐reinforced polymeric composites is a decisive parameter for simulation‐based predictions of common defects that occur during the filling process. This study focuses on the transverse permeability which becomes important for high thickness parts. An instrument that detects the transverse flow front by ultrasound and determines the transverse permeability has been developed. In contrast to other approaches, the developed permeameter uses a nondeflecting (metallic) tool while the selected sensing method is nonintrusive to the material. Novel electromechanical features allow a wide range of measurable preforms. The remaining limitations of the system have been identified and the model that correlates raw ultrasound measurements with flow front has been verified by visual observations. The transverse permeabilities of 18 different preforms have been determined in an experimental scheme designed to isolate the influence of preform thickness. POLYM. COMPOS., 39:360–367, 2018. © 2016 Society of Plastics Engineers

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“…• through-thickness flow with constant pressure [11,5] or constant flow rate [12,13]; • three dimensional flows [14][15][16].…”

Section: Permeabilitymentioning

confidence: 99%

Unified microporomechanical approach for mechanical behavior and permeability of misaligned unidirectional fiber reinforcement

Tran

Comas-Cardona

Abriak

et al. 2010

Composites Science and Technology

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To cite this version:Thang Tran, Sébastien Comas-Cardona, Nor-Edine Abriak, Christophe Binetruy. Unified microporomechanical approach for mechanical behavior and permeability of misaligned unidirectional fiber reinforcement. Composites Science and Technology, Elsevier, 2007, 10.1016/j.compscitech.2010 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT AbstractThe microporomechanical approach (via homogenization schemes) has been used and combined with triaxial tests to verify the Biot theory for the perfectly straight unidirectional fiber assembly in a previous paper [1]. The comparison of theoretical and experimental results is in good agreement, i.e. the Biot coefficients are clearly lower than one for densely packed fiber array. This result will be developed in this article in the case where the fibers are not perfectly straight but in misalignment (unidirectional fiber assembly in localized contact). Furthermore, within the same theoretical framework, the transverse compression modulus and the hydraulic permeability will be also estimated for the fiber reinforcement of double-scale porosity. The homogenization schemes used in this article are the self-consistent and the one proposed by Mori-Tanaka. The estimated and, when possible, bibliographical results for different types of fibrous materials (carbon, kevlar and glass fibers) are compared and show good agreement.

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Measurement of three-dimensional permeability

Cited by 80 publications

References 9 publications

An evaluation of the reproducibility of capacitive sensor based in-plane permeability measurements: A benchmarking study

An evaluation of the reproducibility of capacitive sensor based in-plane permeability measurements: A benchmarking study

Determination of the unsaturated through‐thickness permeability of fibrous preforms based on flow front detection by ultrasound

Unified microporomechanical approach for mechanical behavior and permeability of misaligned unidirectional fiber reinforcement

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