The role of the fiber and the bond in the hygroexpansion and curl of thin freely dried paper sheets

August Brandberg, Hamed Reza Motamedian, Artem Kulachenko, Ulrich Hirn

Research output: Contribution to journalArticle

Abstract

A computationally efficient method to study the in-plane and out-of-plane dimensional instability of thin paper sheets under the influence of moisture changes is presented. The method explicitly resolves the bonded and the free segments of fibers in the sheet, capturing the effect of anisotropic hygroexpansion at the fiber level. The method is verified against a volumetric model. The importance of longitudinal fiber hygroexpansion is demonstrated in spite of the absolute value of longitudinal hygroexpansion being an order of magnitude lower than the transverse hygroexpansion component. Finally, the method is used to demonstrate the formation of macroscopic sheet curl due to a moisture gradient in structurally uniform sheets in the absence of viscoelastic or plastic constitutive behavior and through-thickness residual stress profiles.
Original languageEnglish
Pages (from-to)302-313
JournalInternational Journal of Solids and Structures
Volume193-194
DOIs
Publication statusPublished - 2020

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  • Projects

    CD-Laboratory for Fiber Swelling and Paper Performance

    Hirn, U., Lahti, J. A., Schennach, E., Fischer, W. J., Czibula, C. M., Urstöger, G. J., Ganser, C., Schuller, M., Krainer, S., Xhori, R., Spirk, S. & Niegelhell, K.

    1/12/1530/11/22

    Project: Research project

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