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Elastic-plastic model for the mechanical properties of paperboard as a function of moisture
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.ORCID iD: 0000-0001-7356-1093
RISE Research Institutes of Sweden.ORCID iD: 0000-0002-9689-5966
KTH Royal Institute of Technology, Sweden.
2020 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 35, no 3, p. 353-361Article in journal (Refereed) Published
Abstract [en]

To verify a linear relation between normalized mechanical property and moisture ratio, in-plane tensile tests were performed on four types of paperboard from different manufacturers. Tensile properties were normalized with respect to the property at standard climate (50 % RH, 23 °C). Short-span Compression Tests were also performed to investigate if the relation was linear also for in-plane compression. The tests were performed at different relative humidity (20, 50, 70 and 90 % RH) but with constant temperature (23 °C) in MD and CD, respectively. The linear relation was confirmed for the normalized mechanical properties investigated. In fact, when also the moisture ratio was normalized with the standard climate, all paperboards coincided along the same line. Therefore, each mechanical property could be expressed as a linear function of moisture ratio and two parameters. Moreover, an in-plane bilinear elastic-plastic material model was suggested, based on four parameters: Strength, stiffness, yield strength and hardening modulus, where all parameters could be expressed as linear functions of moisture ratio. The model could predict the elastic-plastic behavior for any moisture content from the two parameters in the linear relations and the mechanical properties at standard climate.

Place, publisher, year, edition, pages
De Gruyter Open Ltd , 2020. Vol. 35, no 3, p. 353-361
Keywords [en]
elastic-plastic, mechanical properties, moisture, paperboard, Compression testing, Elastoplasticity, Paperboards, Tensile testing, Constant temperature, Elastic -plastic models, Elastic-plastic behavior, Elastic-plastic Material, Hardening modulus, In-plane compression, Linear functions, Short-span compression test, Climate models
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-45105DOI: 10.1515/npprj-2019-0104Scopus ID: 2-s2.0-85085653511OAI: oai:DiVA.org:ri-45105DiVA, id: diva2:1447649
Available from: 2020-06-26 Created: 2020-06-26 Last updated: 2023-11-01Bibliographically approved

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Marin, GustavNygårds, Mikael

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