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

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 cree...

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Vydáno v:	European journal of wood and wood products Ročník 78; číslo 6; s. 1095 - 1103
Hlavní autoři:	Afshar, R., Cheylan, M., Almkvist, G., Ahlgren, A., Gamstedt, E. K.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Berlin/Heidelberg Springer Berlin Heidelberg 01.11.2020 Springer Nature B.V
Témata:	Biomedical and Life Sciences Ceramics Cold flow Composites Compressive properties Creep strength Deformation Engineering Science with specialization in Solid Mechanics Glass Life Sciences Linearity Machines Manufacturing Mathematical models Museums Natural Materials Numerical models Numerical prediction Original Article Parameters Processes Rheological properties Shipwrecks Strain Stress-strain curves Stress-strain relationships Teknisk fysik med inriktning mot hållfasthetslära Threshold stress Thresholds Trävetenskap Vasa oak Viscoelasticity wood Wood Science Wood Science & Technology Wooden structures
ISSN:	0018-3768, 1436-736X, 1436-736X
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Popis
Shrnutí:	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.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0018-3768 1436-736X 1436-736X
DOI:	10.1007/s00107-020-01566-1