Scaling and modeling the creep of Eucalyptus globulus

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Scaling and modeling the creep of Eucalyptus globulus

Authors
  • Lopes, Duarte Barroso
  • Matos, João Emílio
Type
Published Article
Journal
Maderas Ciencia y tecnología
Publisher
SciELO Comision Nacional de Investigacion Cientifica Y Tecnologica
Publication Date
Jan 27, 2019
Issue
ahead
Identifiers
DOI: 10.4067/s0718-221x2019005000212
Source
MyScienceWork
Keywords
License
Green

Abstract

Eucalyptus, with the commercial name of Blue gum, is a viscoelastic material strongly influenced when under constant load (creep), being this phenomenon-in the context of displacements-exacerbated with transient relative humidity (variations of the water content in the wood material). The evaluation of bending creep was done in indoor / constant and transient humidity conditions. In the latter, mechano-sorptive effect, the creep bending tests were done for a period of 60 days with cycles of wetting and drying. Each cycle has 7 days of duration. Defect free specimens with dimensions of 20 x 20 x 400 mm 3 (approximately to the scale 1:10) of Eucalyptus globulus wood species were used. To fit the creep behaviour and extrapolate results for different periods (1, 10 and 50 years) a survey of different numerical models was done. Rational, parabolic and polynomial functions were chosen. In bending, Blue gum wood species presented a behaviour without a creep limit, therefore labile. Through the models used for extrapolations a significant variability was found for different periods. Values of the main standard of wood design (Eurocode 5) were exceeded. The most consistent mathematical model was the rational model because it is the one that has led to closer and stable results.

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