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

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:193

Article

Brandberg, August^1,2  Motamedian, Hamid Reza^1,2  Kulachenko, Artem^1,2  Hirn, Ulrich^2,3 

[1] KTH Royal Inst Technol, Dept Engn Mech, Solid Mech, Teknikringen 8D, S-11428 Stockholm, Sweden

[2] Graz Univ Technol, CD Lab Fiber Swelling & Paper Performance, Inffeldgasse 23, A-8010 Graz, Austria

[3] Graz Univ Technol, Inst Paper Pulp & Fibre Technol, Inffeldgasse 23, A-8010 Graz, Austria

关键词: Fiber network;    Hygroexpansion;    Drying;    Moisture;    Paper;    Multiscale;    Simulation;    Curl;    Shrinkage;    Finite element method;    Anisotropic;   

DOI  :  10.1016/j.ijsolstr.2020.02.033

来源: Elsevier

【 摘 要 】

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. (C) 2020 The Authors. Published by Elsevier Ltd.

【 授权许可】

Free