文献类型：期刊文献

英文题名：The relationship between the hydrothermal response of yield stress and the formation of sandwich compressed wood

作者：Wu, Yanmei[1] Huang, Rongfeng[1] Gao, Zhiqiang[1]

第一作者：Wu, Yanmei

通信作者：Huang, RF[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol Natl Forestry & Grassl, Beijing 100091, Peoples R China

年份：2022

卷号：24

期号：1

起止页码：101-118

外文期刊名：JOURNAL OF SANDWICH STRUCTURES & MATERIALS

收录：;EI(收录号：20210909998320);Scopus(收录号：2-s2.0-85101649851);WOS:【SCI-EXPANDED(收录号:WOS:000654565100001)】；

基金：The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was sponsored by the National Natural Science Foundation of China (Grant No. 31670557): Formation Mechanism and Controllability of Wood Sandwich Compression by Hydro-thermal Control.

语种：英文

外文关键词：Yield stress gradient; hydrothermal distribution; sandwich compressed wood; anisotropy; density distribution

摘要：The effects of yield stress of poplar (Poplar x euramericana cv. 'Neva') on temperature (60-210 degrees C), moisture content (oven dry-30%) and grain response mechanism and as well as its role in the formation of sandwich compressed wood were studied in this paper. The results showed that the yield stress of wood was significantly affected by moisture content(MC), temperature and their interaction. Compared with temperature, the relative change rate of yield stress was nearly 10 times higher for each 1% increase in MC than for each 1 degrees C increase in temperature. The experimental data revealed that the relative change rate of yield stress depended on the softening effect of wood by moisture and temperature. The asymmetry of yield stress in different grain direction also depended on wood hydrothermal softening effect. Raising the temperature or increasing the MC could make wood radial vs tangential asymmetry decrease and radial vs radial tangential asymmetry disappear. In the process of hydrothermal compression, the yield stress gradient caused by the hydrothermal softening inside the wood was the main reason for the formation of sandwich compressed wood, and provided a scientific basis for the controllability of the position and thickness of the compressed layer(s).