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Influence of temperature on the transverse behaviour in water-saturated state of tropical wood species

Bardet S., Beauchêne J., Gril J.. 2002. In : Ed. by W. Dwianto, S. Yusuf, E. Hermiati, L. Suryanegara. Sustainable utilization of tropical forest resources: Proceedings of the Fourth International Wood Science Symposium, September 2-5, 2002, Serpong, Indonesia. Serpong : Research Center for Physics, p. 51-56. International Wood Science Symposium. 4, 2002-09-02/2002-09-05, Serpong (Indonésie).

The influence of temperature on the transverse viscoelastic behaviour of green wood was characterised by the apparent radial modulus (ER) in a quasi-static compression test. The glassy transition temperature of 10 tropical species (basic density between 0.2 and 0.9) varied between 53 and 69°C. The influence of both temperature and strain rate was observed on Bocoa prouacensis (Aubl.). The use of an approximated complex diagram revealed a secondary viscoelastic process occurring in the low temperature range. A multiparabolic model, where each parabolic element was replaced by a generalised Maxwell model with a modified-Gaussian relaxation spectrum, was fitted to the observed behaviour in the time range of 0.01 to 100 sec and temperature of 10 to 90°C.

Mots-clés : bois; propriété rhéologique; Élasticité; propriété mécanique

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