Wood Science and Technology

, Volume 28, Issue 6, pp 437–449 | Cite as

Mechano-sorptive effects in wooden material

  • A. Mårtensson


The effects on wood of simultaneous mechanical and moisture loading are studied. In order to clarify the mechano-sorptive behaviour of wood, a review of different phenomena presented in the literature is included. Based on this review a constitutive model is proposed for the case of uniaxial stress in the longitudinal direction. The validity of the model is checked independently against test results. The calculations show that the model is capable of describing the response of wood with reasonable accuracy. Simulations indicate that the response of small test specimens is more difficult to describe than that of larger beams. Some differences in behaviour are found to depend on loading mode and nature of moisture cycling. Very large and fast moisture cycles seem to give larger mechano-sorption than smaller variations. The results of the simulations show that there is a significant influence of strain on the shrinkage and swelling response.


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  1. Arfvidsson, J. 1989: Computer model for two-dimensional moisture transport. Manual for JAM-2. LundGoogle Scholar
  2. Arima, T.; Grossman, P. U. A. 1978: Recovery of wood after mechano-sorptive deformation. J. Inst. Wood Sci. 8, 47–52Google Scholar
  3. Armstrong, L. D.; Christensen, G. N. 1961: Influence of moisture changes on deformation of wood under stress. Nature, No. 4791, 869–870Google Scholar
  4. Armstrong, L. D.; Grossman, P. U. A. 1972: The behaviour of particle board and hardboard beams during moisture cycling. Wood Sci. Technol. 6, 128–137Google Scholar
  5. Bethe, E. 1969: Strength properties of construction wood stored under changing climates and mechanical load, (in German). Holz als Roh- und Werkstoff 27, No. 8, 291–303Google Scholar
  6. Cheng, J. C.; Schniewind, A. P. 1985: Creep buckling of small slender wood columns under cyclic environment. Wood Fiber Sci. 17, No. 2, 159–169Google Scholar
  7. Christensen, G. N. 1962: The use of small specimens for studying the effect of moisture content changes on the deformation of wood under load. Aust. J. Appl. Sci. 13, No. 4, 242–257Google Scholar
  8. Dinwoodie, J. M.; Higgins, J. A.; Paxton, B. H.; Robson, D. J. 1990: Creep research on particleboard — 15 years work at the UK Building Research Establishment. Holz als Roh-und Werkstoff 48, 5–10Google Scholar
  9. Eriksson, L.; Norén, B. 1965: The effect of moisture changes on the deformation of wood with tension in fibre direction, (in German). Holz als Roh-und Werkstoff 23, No. 5, 201–209Google Scholar
  10. Feist, W. C.; Rowell, R. M.; Ellis, W. D. 1991: Moisture sorption and accelerated weathering of acetylated and methacrylated aspen. Wood and Fiber Science Vol. 23, No. 1, 128–136Google Scholar
  11. Fridley, K. J.; Tang, R. C.; Soltis, L. A. 1990: Thermal effects on load-duration behavior of lumber. Part II. Effect of cyclic temperature. Wood and Fiber Science Vol. 22, No. 2, 204–216Google Scholar
  12. Gibson, E. J. 1965: Creep of wood: Role of water and effect of a changing moisture content. Nature 206, 4980, 213–215Google Scholar
  13. Gressel, P. 1984: Influence of sorption behaviour on particleboard properties, (in German). Holz als Roh-und Werkstoff 42, 393–398Google Scholar
  14. Grossman, P. U. A. 1976: Requirements for a model that exhibits mechano-sorptive behaviour. Wood Sci. Technol. 10, 163–168Google Scholar
  15. Hearmon, R. F. S.; Paton, J. M. 1964: Moisture content changes and creep of wood. For. Prod. J., No. 8, 357–359Google Scholar
  16. Hisada, T. 1986: Creep and set behavior of wood related to kiln drying, (in Japanese). Bull. For. Prod. Res. Inst., No. 335, pp. 31–130Google Scholar
  17. Hoffmeyer, P. 1990: Failure of wood as influenced by moisture and duration of load. Doctoral dissertation, State University of New York, College of Environmental Science and Forestry, Syracuse, New YorkGoogle Scholar
  18. Hoyle, R. J.; Itani, R. Y.; Eckard, J. J. 1986: Creep of Douglas-fir beams due to cyclic humidity fluctuations. Wood Fiber Sci. 18, No. 3, 468–477Google Scholar
  19. Hunt, D. G. 1979: A preliminary study of tensile creep of beech with concurrent moisture changes. Volume 3, ICM 3, Cambridge, EnglandGoogle Scholar
  20. Hunt, D. G. 1986: The mechano-sorptive creep susceptibility of two softwoods and its relation to some other material properties. J. Mater. Sci. 21, 2088–2096Google Scholar
  21. Hunt, D. G. 1989: Linearity and non-linearity in mechano-sportive creep of softwood in compression and bending. Wood Sci. Technol. 23, 323–333Google Scholar
  22. Hunt, D. G. 1991: A creep limit in wood. Paper presented at COST workshop, Lund, SwedenGoogle Scholar
  23. Hunt, D. G.; Shelton, C. F. 1988: Longitudinal moisture-shrinkage coefficients of softwood at the mechanosorptive creep limit. Wood Sci. Technol. 22Google Scholar
  24. Keylwerth, R. 1964: Investigations of the free and restraint swelling — Part V: Swelling restrained parallel to grain, (in German). Holz als Roh-und Werkstoff 22, No. 8, 295–296Google Scholar
  25. Kolb, H.; Goth, H.; Epple, A. 1985: Influence of long-term loading, temperature and climate changes on the tensile strength perpendicular to the grain of spruce, (in German). Holz als Roh-und Werkstoff 43, 463–468Google Scholar
  26. Krauss, A. 1988: Investigation of swelling pressure parallel to the grain of wood, (in German). Holzforschung und Holzverwertung 40, No. 4, 65–72Google Scholar
  27. Leicester, R. H. 1971: A rheological model for mechano-sorptive deflections of beams. Wood Sci. Technol. 5, 211–220Google Scholar
  28. Leivo, M. 1988: Effect of moisture changes on the deformations of wooden beams and nail plate joints. Paper pres. at IUFRO Timber Engineering Meeting, FinlandGoogle Scholar
  29. Leivo, M. 199: On the stiffness changes in nail plate trusses. Technical Research Centre of Finland, Publications 80. EspooGoogle Scholar
  30. Meierhofer, U.; Sell, J. 1979: Physical phenomena in timber construction elements exposed to weathering. Part 2: Structural timber elements exposed to outdoor weathering under shelter, (in German). Holz als Roh-und Werkstoff 37, 227–234Google Scholar
  31. Mohager, S. 1987: Studies of creep in wood, (in Swedish). The Royal Institute of Technology. TRITA-BYMA 1987: 8, StockholmGoogle Scholar
  32. Mukudai, J.; Yata, S. 1986: Modeling and simulation of viscoelastic behavior (tensile strain) of wood under moisture change. Wood Sci. Technol. 20, 335–348Google Scholar
  33. Mårtensson, A. 1988a: Interaction between moisture and stress in wooden materials. Report TVSM-3011. Lund Institute of Technology, LundGoogle Scholar
  34. Mårtensson, A. 1988b: Tensile behaviour of hardboard under combined mechanical and moisture loading. Wood Sci. Technol. 22, 129–142Google Scholar
  35. Mårtensson, A.; Thelandersson, S. 1990: Effect of moisture and mechanical loading on wooden materials. Wood Sci. Technol. 24, 247–261Google Scholar
  36. Mårtensson, A. 1992: Mechanical behaviour ot wood exposed to humidity variations. Lund Institute of technolooy. Report TVBK-1006Google Scholar
  37. Norimoto, M.; Gril, J.; Minato, K.; Okamura, K.; Mukudai, J.; Rowell, R. M. 1987: Suppression of creep of wood under humidity change through chemical modification, (in Japanese). Mokuzai Kogyo 42, 504–508Google Scholar
  38. Perkitny, T. 1960: Pressure variations in differently pre-pressed and rigidly clamped wood specimens, (in German). Holz als Roh-und Werkstoff 18, No. 6, 200–210Google Scholar
  39. Perkitny, T.; Kingston, R. S. T. 1972: Review of the sufficiency of research on the swelling pressure of wood. Wood Sci. Technol. 6, 215–229Google Scholar
  40. Put van der T. A. C. M. 1989: Deformation and damage processes in woud. Doctoral dissertation, Delft University PressGoogle Scholar
  41. Ranta-Maunus, A. 1975: The viscoelasticity of wood at varying moisture content. Wood Sci. Technol. 9, 189–205Google Scholar
  42. Sauer, D. J.; Haygreen, J. G. 1968: Effects of sorption on the flexural creep behaviour of hardboard. For. Prod. J. 18(10), 57–63Google Scholar
  43. Taylor, G. D.; West, D. J.; Hilson, B. O. 1991: Creep of glued laminated timber under conditions of varying humidity. Paper pres. at 1991 Int. Timber Eng. Conference, LondonGoogle Scholar
  44. Toratti, T. 1992: Creep of timber beams in a variable environment. Report 31, Lab. of Structural Engineering and Building Physics, Helsinki University of TechnologyGoogle Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • A. Mårtensson
    • 1
  1. 1.Department of Structural EngineeringLund Institute of TechnologyLundSweden

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