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Creep in oak material from the Vasa ship: verification of linear viscoelasticity and identification of stress thresholds

Afshar, R. and Cheylan, M. and Almkvist, Gunnar and Ahlgren, A. and Gamstedt, E. K. (2020). Creep in oak material from the Vasa ship: verification of linear viscoelasticity and identification of stress thresholds. European Journal of Wood and Wood Products. 78 , 1095-1103
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Abstract

Creep deformation is a general problem for large wooden structures, and in particular for shipwrecks in museums. In this study, experimental creep data on the wooden cubic samples from the Vasa ship have been analysed to confirm the linearity of the viscoelastic response in the directions where creep was detectable (T and R directions). Isochronous stress-strain curves were derived for relevant uniaxial compressive stresses within reasonable time spans. These curves and the associated creep compliance values justify that it is reasonable to assume a linear viscoelastic behaviour within the tested ranges, given the high degree of general variability. Furthermore, the creep curves were fitted with a one-dimensional standard linear solid model, and although the rheological parameters show a fair amount of scatter, they are candidates as input parameters in a numerical model to predict creep deformations. The isochronous stress-strain relationships were used to define a creep threshold stress below which only negligible creep is expected. These thresholds ranges were 0.3-0.5 MPa in the R direction and 0.05-0.2 MPa in the T direction.

Authors/Creators:Afshar, R. and Cheylan, M. and Almkvist, Gunnar and Ahlgren, A. and Gamstedt, E. K.
Title:Creep in oak material from the Vasa ship: verification of linear viscoelasticity and identification of stress thresholds
Year of publishing :2020
Volume:78
Page range:1095-1103
Number of Pages:9
Publisher:SPRINGER
ISSN:0018-3768
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Wood Science
URN:NBN:urn:nbn:se:slu:epsilon-p-107008
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-107008
Additional ID:
Type of IDID
DOI10.1007/s00107-020-01566-1
Web of Science (WoS)000546195200001
ID Code:18733
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Molecular Sciences
Deposited By: SLUpub Connector
Deposited On:25 Nov 2020 09:23
Metadata Last Modified:15 Jan 2021 19:02

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