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Experimental study of non-linear stress relaxation and creep of paper materials and the relation between the two types of experiments
RISE, Innventia.ORCID iD: 0000-0001-5902-4291
2010 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 25, no 3, p. 351-357Article in journal (Refereed) Published
Abstract [en]

The non-linear time-dependent mechanical behaviour of three different commercial paper grades was investigated. Stress relaxation and creep tests were carried out in MD and CD using different load levels. The strain in each test was split in a linear part and a non-linear part. From the stress and the linear part of the strain in the test, a stress relaxation modulus or a creep compliance was calculated. The stress relaxation moduli and creep compliances determined in this way were observed to be independent of the load level. The stress relaxation moduli and creep compliances for each paper were further independent of the loading direction (MD/CD) when scaled by the elastic modulus. It was also shown that the stress relaxation modulus was approximately equal to the inverse of the creep compliance, which is what would have been expected if linear viscoelastic theory had been applicable.

Place, publisher, year, edition, pages
2010. Vol. 25, no 3, p. 351-357
Keywords [en]
Creep, Mechanical properties, Stress relaxation, Viscoelasticity
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-29512Scopus ID: 2-s2.0-79955718300OAI: oai:DiVA.org:ri-29512DiVA, id: diva2:1095625
Note

cited By 5

Available from: 2017-05-15 Created: 2017-05-15 Last updated: 2018-07-09Bibliographically approved

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Alfthan, Johan

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