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Nonlinear tensile creep behavior of radiata pineat elevated temperatures and different moisturecontents
New Zealand Forest Research Institute (Scion), New Zealand.
Linnaeus University, Faculty of Technology, Department of Building Technology.ORCID iD: 0000-0001-5591-1045
University of Waikato, New Zealand.
2015 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 69, no 7, p. 915-923Article in journal (Refereed) Published
Abstract [en]

Tensile wood creep has not been measured previouslyin the temperature region 135°C – 150°C for a rangeof moisture content (MC) up to fiber saturation point dueto equipment and measurement challenges. Yet this is theregion where the most dramatic softening effects can beobserved. The aim of this study was to develop specializedequipment to measure tensile solid wood creep over70°C – 150° C for a range of MC and loads. Creep displacementwas successfully able to be isolated from elasticand mechanosorptive strains and statistically modeledby regression analysis. This proved more accurate thancomplex series expansions consisting of spring- and dashpot-type components. The best creep displacement relationshipwas a power law with a strain root mean squareerror of 0.28%. The amplitude of the power law was nonlinearwith respect to stress and temperature and changedby a stress factor of up to 0.9 for a stress of up to 1.2 MPaand by a temperature factor 1.2 – 6.3 over the investigatedrange. The creep relationship provides a valuable tool forpredicting time-dependent distortion and internal stressof wood during drying or thermohygromechanical modificationbelow 150°C.

Place, publisher, year, edition, pages
Walter de Gruyter, 2015. Vol. 69, no 7, p. 915-923
Keywords [en]
High temperature, material properties, moisture content, nonlinear creep, softening, tensile creeping, thermohygromechanical (THM), wood
National Category
Engineering and Technology Wood Science
Research subject
Technology (byts ev till Engineering), Civil engineering; Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-41657DOI: 10.1515/hf-2014-0240ISI: 000360628700010Scopus ID: 2-s2.0-84941101315OAI: oai:DiVA.org:lnu-41657DiVA, id: diva2:800198
Available from: 2015-04-02 Created: 2015-04-02 Last updated: 2017-12-04Bibliographically approved

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Ormarsson, Sigurdur

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CiteExportLink to record
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