文献类型：期刊文献

英文题名：Orthotropic mechano-sorptive creep behavior of Chinese fir during the moisture adsorption process determined in tensile mode via dynamic mechanical analysis (DMA)

作者：Peng, Hui[1,3] Jiang, Jiali[1,2] Lu, Jianxiong[1,2] Cao, Jinzhen[3]

第一作者：Peng, Hui

通信作者：Jiang, JL[1];Jiang, JL[2]|[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;[2]Cent South Univ Forestry & Technol, Hunan Collaborat Innovat Ctr Effect Utilizing Woo, Changsha 410004, Hunan, Peoples R China;[3]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing 100083, Peoples R China

年份：2019

卷号：73

期号：3

起止页码：229-239

外文期刊名：HOLZFORSCHUNG

收录：;EI(收录号：20183805821051);Scopus(收录号：2-s2.0-85053144478);WOS:【SCI-EXPANDED(收录号:WOS:000460124200004)】；

基金：This research was sponsored by the Fundamental Research Funds of Chinese Academy of Forestry (CAFYBB2017QB005) and the National Natural Science Foundation of China, Funder Id: 10.13039/501100001809 (31570548).

语种：英文

外文关键词：Chinese fir; dynamic mechanical analysis (DMA); free swelling; mechano-sorptive creep (MSC); moisture adsorption; orthotropic grain orientation; relative humidity (RH); tensile mode; viscoelastic creep (VEC)

摘要：The orthotropic viscoelastic creep (VEC) at a constant moisture content (MC) and mechano-sorptive creep (MSC) during the adsorption process were examined for Chinese fir (Cunninghamia lanceolata) under tension at 20, 40, 60 and 80% relative humidity (RH) (30 degrees C). Free swelling was performed on matched specimens based on the strain partition assumption to better understand the characteristics of the mechano-sorptive (MS) phenomenon. Expansion, elastic and time-dependent creep behaviors of radial (R) and tangential (T) specimens were affected by the MC to a higher degree than those of the longitudinal (L) specimen. A higher proportion of elastic strain in total strain was found in the L specimen as compared with transverse specimens, regardless of VEC and MSC. The RH level had a greater effect on relaxation behavior in the L specimen for MSC. According to the three tests, expansion mainly dominated the creep strain during adsorption, especially for the I, specimen. The MS strain exerted more influence on transverse specimens and had less contribution to the L specimen. Moreover, under all RH isohume (RHI) conditions, the unstable state contributed to MS strain diminishing as MC approached equilibrium moisture content (EMC). A shorter adsorption time to a new equilibrium state was achieved at the expense of intensifying the unstable state of the wood cell wall.