文献类型：期刊文献

英文题名：Temperature-dependent orthotropic swelling of Chinese fir assessed by digital image correlation combined with X-ray densitometry

作者：Sun, Fengze[1] Wang, Wendi[1] Yi, Xingzhu[1] Peng, Hui[1] Li, Zhu[2] Jiang, Jiali[2] Zhan, Tianyi[1] Cai, Liping[1] Lyu, Jianxiong[1]

第一作者：Sun, Fengze

通信作者：Lyu, J[1]

机构：[1]Nanjing Forestry Univ, Coll Mat Sci & Engn, Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Nanjing 210037, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2025

卷号：59

期号：5

外文期刊名：WOOD SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20253419037978);Scopus(收录号：2-s2.0-105013773954);WOS:【SCI-EXPANDED(收录号:WOS:001554062600003)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2023YFD2200501) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX25_1419).

语种：英文

外文关键词：Image analysis - Impregnation - Strain measurement - Swelling - Wood products

摘要：Wood is a naturally capillary absorbing material with a hierarchical structure. Understanding the orthotropic imbibition dynamics of water and corresponding swelling in wood is valuable for providing guidance for the movement of water and impregnating liquids during wood processing and utilization. In this study, we performed a one-side imbibition test with 25 degrees C and 50 degrees C water, by combining the digital image correlation (DIC) and X-ray densitometry to evaluate the orthotropic imbibition behaviour and corresponding temperature-dependent water uptake-induced swelling of Chinese fir (Cunninghamia lanceolata [Lamb.] Hook). The results showed that the water imbibition height and average moisture content (MC) at water temperature of 50 degrees C were higher than those at 25 degrees C. After 24 h of imbibition, average MC at 50 degrees C was 1.3 to 1.9 times than at 25 degrees C along three directions. The enhancement of water uptake amount along the longitudinal direction by high water temperature was weaker due to the closed structure of the tracheids. Moreover, transverse swelling strain (epsilon R and epsilon T) was greater at higher temperature. The epsilon R of latewood demonstrated stronger temperature dependence than that of earlywood, which was attributed to more swelling of the thicker cell wall due to water at higher temperature. Notably, latewood exerted a restraining effect on adjacent earlywood in transverse swelling, and the effect increased with increasing strain of latewood. A correspondence between MC and radial strain was established at growth rings level, offering theoretical guidance for understanding water movement in wood and evaluating structure-property relationships within growth rings.