Influence of histories on dynamic viscoelastic properties and dimensions of water-swollen wood |
| |
Authors: | Keisuke Kojiro Yuzo Furuta Yutaka Ishimaru |
| |
Institution: | (1) Biological Function Science Course, Research Division of Agriculture, Graduate School of Kyoto Prefectural University, 1-5 Shimogamo Nakaragi-cho, Sakyo-ku, Kyoto 606-8522, Japan |
| |
Abstract: | The influences of heating history, cooling method, and cooling set on microstructures and the mechanical properties of water-swollen
wood were studied by measuring viscoelastic properties and dimensional changes while elevating temperatures between 20°C and
90°C. Both the viscoelastic properties and dimensional changes of waterswollen wood in the first heating process were quite
different from those in the other heating processes. The results revealed that the molecular state of green wood around room
temperature was stabilized and could not return to this state if drying or heating was carried out. Cooling methods greatly
affected the viscoelastic properties, while they hardly affected dimensional changes when the temperature was elevated. Localized
stress in the microstructures of water-swollen wood produced by quenching affected the mechanical properties in the heating
process, while external stress less than the proportional limit caused by a cooling set had no effect. This revealed that
much greater localized stress linked to the instability of waterswollen wood than the external stress in relation to the cooling
set occurred.
Part of this report was presented at the 53rd Annual Meeting of the Japan Wood Research Society, Fukuoka, March 2003 |
| |
Keywords: | Water-swollen wood Unstable state Dynamic viscoelastic property Dimensional change Microstructure |
本文献已被 SpringerLink 等数据库收录! |
|