文献类型：期刊文献

英文题名：Effects of compressed layer(s) position and thickness on the physico-mechanical properties of sandwich-compressed Chinese fir (Cunninghamia lanceolata)

作者：Zhao, Liyuan[1] Huang, Rongfeng[1] Wang, Yanwei[2] He, Xiaoyu[2] Sun, Longxiang[2] Fu, Yuejin[1] Feng, Shanghuan[3]

第一作者：Zhao, Liyuan

通信作者：Huang, RF[1];Feng, SH[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Treessun Flooring Co Ltd, Nanxun, Peoples R China;[3]Int Ctr Bamboo & Rattan, Beijing 100020, Peoples R China

年份：2024

外文期刊名：WOOD MATERIAL SCIENCE & ENGINEERING

收录：;EI(收录号：20243717016908);Scopus(收录号：2-s2.0-85203264699);WOS:【SCI-EXPANDED(收录号:WOS:001308449200001)】；

基金：This work was supported by the Key R&D Program of Huzhou, Zhejiang Province (Grant number 2022ZD2049) and the National Natural Science Foundation of China (Grant number 32071690).

语种：英文

外文关键词：Densification; mechanical properties; position of compressed layer(s); sandwich compression; wood

摘要：This study investigated the effects of compressed layer(s) position and thickness on the mechanical properties of sandwich compressed Chinese fir (Cunninghamia lanceolata) . When it was compressed by 10 mm, sandwich compressed layers position significantly impacted wood hardness, MOR, and MOE. When the distance between the compressed layers and surface increased from 0 to 5.5 mm, wood hardness and surface hardness decreased from 22.14 MPa to 11.09 MPa and from 4.23 MPa to 3.43 MPa, respectively. Due to the increased distance, MOR and MOE initially increased and maximized at 105.56 MPa and 14.30 GPa, then decreased. Increasing surface compressed layers thickness significantly enhanced wood hardness, surface hardness, MOR, and MOE. When the compressed layers thickness reached 5.96 mm, wood hardness, surface hardness, MOR and MOE increased to 2.6 times, 3.2 times, 1.6 times and 1.5 times those of the control. Compared to surface compression, multi-layer compression resulted in lower surface hardness, but the variations in wood hardness, MOR and MOE between the two methods were not significant. When multi-layer compressed wood was used for lock flooring, a few tongue detachments occurred under transverse tension while very few tongue failures or cracking were observed. This suggested that the densification of the central compressed layer played a crucial role in enhancing the strength of the lock joints.