NDLI: Rheological characterization of dry-formed networks of rayon fibres

Content Provider	Springer Nature Link
Author	Askling, C. Wågberg, L. Rigdahl, M.
Copyright Year	1998
Abstract	The viscoelastic properties of low-density dry-formed fibre networks have been evaluated by dynamic mechanical measurements in shear. The fibres used were rayon fibres of different diameters (13, 30 and 60 μm) and lengths (2, 4 and 6 mm). The effects of network density and grammage on the viscoelastic properties of the network were demonstrated. An important objective of this study was to assess relations between mechanical properties and fibre or network characteristics. The primary mechanical parameters used to describe the networks were the storage modulus G $_{0}$′ measured at very low imposed strain amplitudes (in the linear region) and the critical strain γ$_{C}$ at which the network yields significantly. It was noted that if the network is to be able to withstand high deformations it should exhibit a high value Of γ$_{C}$, which in turn, is promoted by a short free segment length between fibre crossings and a large number of contact points per fibre in the network. Long and thin fibres provide an advantage in this context. The modulus G $_{0}$′ appeared to be related to the ratio of the free segment length to the fibre diameter. A lower value of this ratio corresponds to a higher G $_{0}$′ value and an improved load transfer through the network structure. The networks studied here should in general be regarded as weak compared with other types of networks, e.g. paper.
Starting Page	1517
Ending Page	1527
Page Count	11
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	33
Issue Number	6
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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