文献类型：期刊文献

英文题名：Moisture-dependent orthotropic viscoelastic properties of Chinese fir wood in low temperature environment

作者：Li, Zhu[1] Jiang, Jiali[1] Lu, Jianxiong[1]

第一作者：李珠

通信作者：Jiang, JL[1]|[a0005c4a974b7fbd344a8]蒋佳荔;

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China

年份：2018

卷号：64

期号：5

起止页码：515-525

外文期刊名：JOURNAL OF WOOD SCIENCE

收录：;EI(收录号：20182605360806);Scopus(收录号：2-s2.0-85048820936);WOS:【SCI-EXPANDED(收录号:WOS:000446490500006)】；

基金：This research was sponsored by the Fundamental Research Funds of Chinese Academy of Forestry (CAFYB-B2017QB005) and the National Natural Science Foundation of China (No. 31570548).

语种：英文

外文关键词：Chinese fir wood; Moisture content; Orthotropic viscoelasticity; Tension; Low temperature

摘要：The influence of moisture content (MC) on the orthotropic viscoelasticity of Chinese fir wood (Cunninghamia lanceolata [Lamb.] Hook.) has been examined in low temperature environment. Storage modulus E and loss modulus E of wood with six different levels of MC ranging from 0.6 to 22.0% were determined from -120 to 40 degrees C and at multi-frequency range of 0.5, 1, 2, 5, and 10Hz using a TA instruments((R)) Dynamic Mechanical Analyzer (DMA 2980). The results showed that a distinct moisture dependency is exhibited by the orthotropic viscoelastic behaviour of Chinese fir wood. With the exception of some apparent activation energy (E) for -relaxation process, the E decreased and the E peak temperatures moved towards lower temperature and the E for -relaxation process became lower with MC increasing in all orthotropic directions, whereby individual decline of E and the E peak temperatures were affected by MC to different degrees. Besides, a little E peak at around 0 degrees C was only seen in L direction, which could be attributed to the melting of frozen water. Furthermore, the dynamic viscoelastic behavior of wood is also dependent on the measurement frequency. The findings suggest that the orthotropic structure and moisture content have an important influence on the viscoelastic performance in low temperature environment.