文献类型：期刊文献

英文题名：Full-field tracking and analysis of shrinkage strain during moisture content loss in wood

作者：Fu, Zongying[1,2] Weng, Xiang[1,2] Gao, Yufa[1,2] Zhou, Yongdong[1,2]

第一作者：付宗营;Fu, Zongying

通信作者：Zhou, YD[1];Zhou, YD[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Natl Forestry & Grassland Adm, Key Lab Wood Sci & Technol, Beijing 100091, Peoples R China

年份：2021

卷号：75

期号：5

起止页码：436-443

外文期刊名：HOLZFORSCHUNG

收录：;EI(收录号：20204009301311);Scopus(收录号：2-s2.0-85091842429);WOS:【SCI-EXPANDED(收录号:WOS:000646028800004)】；

基金：This work was financed by a grant-in-aid for scientific research from the Youth Program of National Natural Science Foundation of China (No. 31800478).

语种：英文

外文关键词：anisotropic shrinkage; digital image correlation; displacement; moisture content loss; shrinkage strain

摘要：Anisotropic shrinkage is a typically feature in wood, which is of critical importance in wood drying. In this study, the shrinkage strains over each growth ring were determined by a full-field strain measurement system during moisture content (MC) loss. Color maps were used to visualize the full-field distribution of displacement and shrinkage strain under different MC conditions. The variation of tangential and radial shrinkage strain from pith to bark, as well as the anisotropic shrinkage in heartwood and sapwood were studied. Both of the displacement and strain values increased as the MC decreased. From pith to bark, the tangential strains were higher at two poles as compared to the center, showing a parabolic distribution below fiber saturation point. While for radial shrinkage strain, a minor difference was observed except for the MC of 10%. An intersection between tangential and radial shrinkage ratio curve was observed at the MC of 28%. Both expansion and shrinkage in tangential direction were larger than radial counterparts, and the transformation from expansion to shrinkage occurred at the MC region of 32-28%. In addition, the shrinkage in heartwood was larger than sapwood, whereas anisotropic shrinkage in sapwood was more pronounced as compared to heartwood.