Mechano-sorptive creep under compressive loading: a micromechanical model
2008 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 45, no 9, 2420-2450 p.Article in journal (Refereed) Published
The creep of paper is accelerated by moisture cycling, an effect known as mechano-sorptive creep. It has also been observed that the mechano-sorptive effects are larger in compression than in tension. In this paper a simplified network model for mechano-sorptive creep is presented. It is assumed that the anisotropic hygroexpansion of the fibres leads to large stresses at the fibre-fibre bonds when the moisture content changes. The resulting stress state will accelerate creep if the fibre material obeys constitutive laws that are non-linear in stress. Geometrical fibre effects are included in the model in order to capture experimental observations of the differences between paper loaded in tension and compression. Theoretical predictions based on the developed model are compared to experimental results for paper both under tensile and compressive loading at varying moisture content. The important features in the experiments are captured by the model, i.e. the creep is accelerated by the moisture cycling and the mechano-sorptive effects are larger in compression than in tension.
Place, publisher, year, edition, pages
2008. Vol. 45, no 9, 2420-2450 p.
mechano-sorptive creep, accelerated creep, paper, modelling, moisture changes, humidity change, sorption, fibres, creep, network model, fibre network, mathematical model, fibre bonding, tension, compression
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-7945DOI: 10.1016/j.ijsolstr.2007.12.002ISI: 000254982400003ScopusID: 2-s2.0-40649090096OAI: oai:DiVA.org:kth-7945DiVA: diva2:13131
QC 20100910. Uppdaterad från in press till published (20100910).2008-01-312008-01-312010-09-10Bibliographically approved