Concurrent characterization of through-thickness permeability and compaction of fiber reinforcements
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Author / Producer
Date
2021-02
Publication Type
Journal Article
ETH Bibliography
yes
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Abstract
Flow-induced fiber-bed compaction has considerable effects on through-thickness permeability due to resulting changes in fiber-volume-fractions. This study introduces a novel method for the simultaneous characterization of compaction and unsaturated out-of-plane permeability of engineering textiles in one single experiment. The measurement technique relies on visually tracking flow-front positions and compaction during through-thickness impregnation using a camera and a rigid tool equipped with a pressure sensor and a transparent window. This strategy allows flow-induced fiber-bed compaction to be considered in unsaturated permeability measurements, providing permeability at different fiber-volume-fractions, whilst also providing dry and wet compaction curves. This new measurement tool also readily verifies any race-tracking that may occur during impregnation, which drastically influences flow behavior. The method is successfully validated through testing of glass fiber NCF and woven fabrics, where permeability results are compared to analytical solutions, while compaction results are compared to those obtained from a universal testing machine. © 2020 Elsevier Ltd.
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Publication status
published
Editor
Book title
Journal / series
Volume
141
Pages / Article No.
106203
Publisher
Elsevier
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Through-thickness permeability; Fiber-bed compaction; Unsaturated permeability
Organisational unit
03507 - Ermanni, Paolo (emeritus) / Ermanni, Paolo (emeritus)