文献类型：期刊文献

英文题名：Mechanism elucidation for wood sandwich compression from the perspective of yield stress

作者：Huang, Rongfeng[1] Feng, Shanghuan[2] Gao, Zhiqiang[3] Liu, Hao[4]

第一作者：黄荣凤

通信作者：Huang, RF[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol State Forestry & Grassl, Beijing 100091, Peoples R China;[2]Int Ctr Bamboo & Rattan, Key Lab Natl Forestry & Grassland Adm Beijing Bam, Beijing 100102, Peoples R China;[3]Xi Chang Univ, Coll Agr Sci, Xi Chang 615000, Sichuan, Peoples R China;[4]Chinese Acad Forestry, Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China

年份：2023

外文期刊名：HOLZFORSCHUNG

收录：;EI(收录号：20232614299849);Scopus(收录号：2-s2.0-85162779986);WOS:【SCI-EXPANDED(收录号:WOS:001009886800001)】；

基金：This research was funded by the National Natural Science Foundation of China (grant nos. 32071690 and 31670557).

语种：英文

外文关键词：hygrothermal conditions; moisture distribution; regulation of density distribution; stress-strain; yield stress

摘要：To elucidate the mechanism of wood sandwich compression, the response of wood compressing yield stress to hygrothermal conditions was investigated in this study with respect to preheating temperature (30-210 degrees C) and moisture content (MC, 0-100 %). An associated functional model was developed to predict wood yield stress based on the measured MC and temperature in wood. A 1 % increase in wood MC or a 10 degrees C increase of temperature led to a decrease in wood yield stress exceeding 0.1 MPa. Significant variations in yield stress, exceeding 0.8 MPa, were observed between high MC layer(s) and the remaining layer(s) along the wood thickness when there was an MC variation over 5 %. Preheating the wood with by heating platens accelerated water/moisture migration in wood, resulting in relatively low yield stress in the wood interior areas where water/moisture had migrated. This study demonstrated that the comparatively low yield stress of some wood areas was responsible for sandwich compression. When mechanically compressed, only the wood layer(s) with lower yield stress was compressed, leading to sandwich compression, regard-less of whether the mechanical force was applied tangentially or radially.