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Bending creep behavior of hot-pressed wood under cyclic moisture change conditions

Abstract

This study examined the bending creep behavior of hot-pressed wood during cyclic moisture changes. Sugi (Cryptomerica japonica D. Don) specimens were pressed in the radial direction under six combinations of nominal compressive strain (33% and 50%) and press temperatures (140°C, 170°C, 200°C). Creep tests were conducted at 20°C with three cyclic relative humidity changes between 65% and 95% under 25% of short-breaking stress. The effect of moisture content (MC) change on elastic compliance and mechanosorptive (MS) compliance was investigated. The relation between MS compliance and thickness swelling was studied. The results indicated that total compliance increased over the history of cyclic moisture changes; and its behavior was closely related to the changes in MC and thickness swelling. The total compliance increased during adsorption and decreased during desorption. Elastic compliance increased linearly with MC and was dependent on press temperature and compression. With increasing MC change, MS compliance increased during adsorption and decreased during desorption. The first adsorption led to greater MS compliance than did the subsequent adsorption with the same amount of MC change. In general, the elastic parameterK E and the MS parameterK Mincreased with compression and decreased as the press temperature increased. The MS parameterK M was apparently greater than the elastic parameterK E. The MS parameterK M increased with swelling coefficient KSW of the hot-pressed specimen during adsorption and decreased with an increasing shrinkage coefficientK SH during desorption.

References

  1. 1.

    Kitazawa K, Murakami K (1997) Holding phenomenon of annual ring in sugi (Cryptomerica japonica D. Don) specimen under large compression with closed-die forging method (in Japanese). Jpn Machinery Soc Bull 63(614):354–360

  2. 2.

    Kitazawa K, Murakami K (1997) Possibility of closed-die forging of cylindrical panels of sugi lumber (in Japanese). Jpn Machinery Soc Bull 63(616):286–292

  3. 3.

    Stamm AJ (1964) Wood and cellulose science. Ronald Press, New York, p 549

  4. 4.

    Dwianto W, Norimoto M, Morooka T, Tanaka F, Inoue M, Liu Y (1998) Radial compression of sugi wood (Cryptomerica japonica D. Don). Holz Roh Werkstoff 56:403–411

  5. 5.

    Saito F (1973) Springback of hot-pressed wood in humidification and water-soaking tests (in Japanese). Mokuzai Gakkaishi 19:221–226

  6. 6.

    Arima T (1978) Recovery of hot-pressed wood (in Japanese). Wood Ind 33(8):13–17

  7. 7.

    Suematsu A, Hirai N, Saito F (1980) Properties of hot pressed wood I. Hygroscopicity, water absorption and dynamic viscoelasticity (in Japanese). Mokuzai Gakkaishi 26:581–586

  8. 8.

    Inoue M, Kadokawa N, Nishio J, Norimoto M (1993) Permanent fixation of compressive deformation by hygro-thermal treatment using moisture in wood (in Japanese). Wood Res Bull 29:54–61

  9. 9.

    Norimoto M (1994) Transverse compression of wood and its application to wood processing (in Japanese). Wood Res Bull 30:1–15

  10. 10.

    Inoue M, Norimoto M, Tanahashi M, Rowell RM (1993) Steam or heat fixation of compressed wood. Wood Fiber Sci 25:224–235

  11. 11.

    Tabarsa T, Chui YH (1997) Effects of hot-pressing on properties of white spruce. For Prod J 47(5):71–76

  12. 12.

    Armstrong LD, Kingston RST (1962) The effect of moisture content changes on the deformation of wood under stress. Aust J Appl Sci 13:257–276

  13. 13.

    Tokumoto M (1994) Creep and set in the non-equilibrium states of moisture (in Japanese). Mokuzai Gakkaishi 40:1157–1164

  14. 14.

    Tokumoto M (1998) Study on wood creep in the non-equilibrium states of moisture (in Japanese). In: Proceedings of Rheology Research Association of Japan Wood Research Society. JWRS, Nagoya, December 1998, pp 3–10

  15. 15.

    Zhou Y, Fushitani M, Kubo T (2000) Effect of stress level on bending creep behavior of wood during cyclic moisture changes. Wood Fiber Sci 32(1):20–28

  16. 16.

    Zhou Y, Fushitani M, Kubo T, Ozawa M (1999) Bending creep behavior of wood under cyclic moisture changes. J Wood Sci 45:113–119

  17. 17.

    Bryan EL, Schniewind AP (1965) Strength and rheological properties of particleboard. For Prod J 4:143–148

  18. 18.

    Arima T, Sato M, Mashita K (1981) Studies on evaluation method for long-term performance of wood-based materials and elements (in Japanese). Report of the Building Research Institute, Japan, No. 95

  19. 19.

    Halligan AF (1970) A review of thickness swelling in particleboard. Wood Sci Technol 4:301–312

  20. 20.

    Panshin AJ, DeZeeuw C (1980) Textbook of wood technology, 4th edn. McGraw-Hill, New York, p 365

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Correspondence to Masami Fushitani.

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Zhou, Y., Fushitani, M., Sato, K. et al. Bending creep behavior of hot-pressed wood under cyclic moisture change conditions. J Wood Sci 46, 423–430 (2000). https://doi.org/10.1007/BF00765799

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Key words

  • Hot-pressed wood
  • Creep
  • Cyclic moisture sorption
  • Bending stress
  • Sugi