文献类型：期刊文献

英文题名：Comparison analysis of moisture-dependent orthotropic elasticity between earlywood and latewood in Chinese fir using digital image correlation

作者：Sun, Fengze[1] Li, Rui[1] Zhu, Jianyi[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：2024

卷号：220

外文期刊名：INDUSTRIAL CROPS AND PRODUCTS

收录：;EI(收录号：20242916700163);Scopus(收录号：2-s2.0-85198293482);WOS:【SCI-EXPANDED(收录号:WOS:001270535800001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2023YFD2200501) , National Natural Science Foundation of China (No. 32101454) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX23_1190) .

语种：英文

外文关键词：Wood; Moisture; Orthotropic elasticity; Digital image correlation; Body deformation

摘要：Given its orthotropic and hygroscopic nature, Chinese fir exhibits varying mechanical behaviors in earlywood and latewood due to its naturally inhomogeneous structure when exposed to changes in loading direction and given moisture content (MC) range from 7.9 % to 16.1 %. In this study, we combined micro-tensile testing and the digital image correlation (DIC) technique to derive the moisture-dependent orthotropic elastic constants, i.e., Young's modulus (E), Poisson's ratio (nu) and shear modulus (G) for both earlywood and latewood in Chinese fir. The findings revealed that when loading in the parallel direction, the restraining effect caused by latewood on earlywood resulted in a difference compared with loading in series. Interestingly, the loading direction impacted the restraining effect more significantly than MC. Additionally, both Young's modulus and shear modulus exhibited decreases with increasing MC within above range for both earlywood and latewood. Notably, the Young's modulus of earlywood showed a higher sensitivity to MC variations compared to latewood. However, Poisson's ratio did not consistently correlate with MC within above range in all orthotropic directions. A threedimensional coordinate system visualization of the compliance parameters highlighted the differing sensitivities of earlywood and latewood to moisture. The independent moisture-dependent elastic components of earlywood and latewood derived in this study extended the moisture-dependent mechanical model of wood, offering theoretical guidance for the practical application of Chinese fir and other wood species.