Advertisement

Journal of Wood Science

, Volume 51, Issue 4, pp 401–404 | Cite as

Elastic strain at semi-isostatic compression of Scots pine (Pinus sylvestris)

  • Jonas BlombergEmail author
NOTE

Abstract

Quarter-sawn and plain-sawn specimens of Scots pine were semi-isostatically compressed at 5, 15, 50, and 140 MPa in a Quintus press. Elastic strain was measured using a telescope device that was pushed together when wood was compressed and remained in this position at release of pressure. Delayed elastic and plastic strains were assessed through repeated callipering during 5 years after densification. At 140 MPa, wood reached an almost compact structure (ρ ≈ 1450 kg/m3) but as a result of elastic springback the density decreased to just below 1000 kg/m3. At 140 MPa, the elastic and delayed elastic strains were 14.6% and 1.8%, respectively, in quarter-sawn specimens, and were 13.1% and 0.8%, respectively, in plain-sawn specimens. The higher elastic strains in quarter-sawn specimens can be attributed to elastic springback in the tangentially deformed latewood bands.

Key words

Elastic strain Semi-isostatic compression Quintus press Density 

References

  1. 1.
    Blomberg, J, Persson, B 2004Plastic deformation in small clear pieces of Scots pine (Pinus sylvestris L.) during densification with the CaLignum processJ Wood Sci50307314CrossRefGoogle Scholar
  2. 2.
    Dinwoodie, JM 2000Timber: its nature and behaviour2nd edn.SponLondon93146159–160Google Scholar
  3. 3.
    Tang, Y, Simpson, WT 1990Perpendicular-to-grain rheological behavior of loblolly pine in press dryingWood Fiber Sci22326342Google Scholar
  4. 4.
    Adalian, C, Morlier, P 2002“WOOD MODEL” for the dynamic behaviour of wood in multiaxial compressionHolz Roh Werkst60433439CrossRefGoogle Scholar
  5. 5.
    Trenard, Y 1977Study of the isostatic compressibility of some timbersHolzforschung31166171Google Scholar
  6. 6.
    Bucur, V, Garros, S, Barlow, CY 2000The effect of hydrostatic pressure on physical properties and microstructure of spruce and cherryHolzforschung548392CrossRefGoogle Scholar
  7. 7.
    Tabarsa, T, Chui, YH 2001Characterizing microscopic behavior of wood under transverse compression. Part II. Effect of species and loading directionWood Fiber Sci33223232Google Scholar
  8. 8.
    Kellogg, RM, Wangaard, FF 1969Variation in the cell-wall density of woodWood Fiber1180204Google Scholar
  9. 9.
    Kollmann, FFP, Côté, WA 1984Principles of wood science and technology, vol 1: solid woodSpringerBerlin Heidelberg New York302309315–321Google Scholar
  10. 10.
    Dwianto, W, Morooka, T, Norimoto, M 2000Compressive creep of wood under high temperature steamHolzforschung54104108CrossRefGoogle Scholar
  11. 11.
    Guizhen, F, Yongzhi, C, Delong, C 1998Fixation of heavy compression deformation of wood treated with polycarboxylic acidsChina Wood Ind121619Google Scholar
  12. 12.
    Peyer, SM, Wolcott, MP, Fenoglio, DJ 2000Reducing moisture swell of densified wood with polycarboxylic acid resinWood Fiber Sci32520526Google Scholar

Copyright information

© The Japan Wood Research Society 2005

Authors and Affiliations

  1. 1.Dalarna UniversityBorlängeSweden
  2. 2.Luleå University of Technology, Skellefteå CampusSkellefteåSweden

Personalised recommendations