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Wood Science and Technology

Erschienen in:

01.05.2014 | Original

Wood as a natural smart material

verfasst von: Boris N. Ugolev

Erschienen in: Wood Science and Technology | Ausgabe 3/2014

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Abstract

The dominant feature of artificial smart materials is the “shape memory” effect. This phenomenon is based on frozen strains (FS). They were detected in wood fastened specimens during drying in the early 1960s. The integral law of wood deforming under loading and moisture content and/or temperature changes was subsequently formulated. This law takes into account the forming of FS. It was applied for the calculation of wood drying stresses. Stress memory and strain memory effects for wood were discovered. Wood has the ability to recollect the type of loading (tension or compression) which it had undergone. The difference between the free and restrained shrinkage is named “frozen shrinkage” (FSh). In calculations of drying stresses, it is more justified to use the FSh concept than “mechano-sorptive creep” (MSC). The MSC phenomenon is observed at cyclical change of moisture content in loaded wood. “Hygrofatigue” that reduces wood stiffness plays the main role in this process.

Vorheriger Artikel The analytical influence of all types of knots on bending

Nächster Artikel Mechano-sorptive creep in pulp fibres and paper

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Titel: Wood as a natural smart material
verfasst von: Boris N. Ugolev
Publikationsdatum: 01.05.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: Wood Science and Technology / Ausgabe 3/2014
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-013-0611-2

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