Mechanics of Time-Dependent Materials

, Volume 8, Issue 4, pp 289–302 | Cite as

The Effect of Humidity Cycle Amplitude on Accelerated Tensile Creep of Paper

  • Johan AlfthanEmail author


The creep of paper is accelerated by moisture cycling, an effect known as mechano-sorptive creep. In this paper, the effect of different amplitudes of the moisture content is investigated experimentally and numerically. Tensile creep tests were made in a climate chamber. Low basis weight isotropic sheets were used in the tests. The moisture content history was measured during each creep test using a balance placed in the climate chamber. The experimental results are compared to predictions using a theoretical network model. A brief description of the model is given. In the model it is assumed that the anisotropic hygroexpansion of the fibres produces large stresses at the fibre–fibre bonds when moisture changes. The resulting stress state will accelerate creep if the material obeys creep laws that are nonlinear in stress. A quite good fit between the theoretical model and the experimental creep curves is obtained.

Key words

creep test mechano-sorptive creep moisture accelerated creep network model paper 


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Copyright information

© Springer Science + Business Media, Inc. 2004

Authors and Affiliations

  1. 1.KTH Solid MechanicsRoyal Institute of TechnologyStockholmSweden

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