文献类型：期刊文献

英文题名：Compressive Mechanical Properties of Larch Wood in Different Grain Orientations

作者：Sun, Jingcheng[1,2] Zhao, Rongjun[1,2,3] Zhong, Yong[1,2,3] Chen, Yongping[1,2]

第一作者：Sun, Jingcheng

通信作者：Chen, YP[1];Chen, YP[2]|[a0005bf517d9335e69ac8]陈勇平;

机构：[1]Chinese Acad Forestry, Inst Ecol Conservat & Restorat, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[3]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Pr, Nanjing 210037, Peoples R China

年份：2022

卷号：14

期号：18

外文期刊名：POLYMERS

收录：;EI(收录号：20224012817369);Scopus(收录号：2-s2.0-85138821690);WOS:【SCI-EXPANDED(收录号:WOS:000857647400001)】；

基金：This research was funded by the Fundamental Research Funds of CAF (CAFYBB2019SY033).

语种：英文

外文关键词：compressive failure mechanism; larch wood; digital image correlation method (DIC); load-displacement curve; energy dissipation

摘要：As a green and low-carbon natural polymer material, wood has always been popular in engineering applications owing to its excellent physical and mechanical properties. In this study, compression tests in conjunction with in situ test methods (DIC method) were used to investigate the compression mechanism of wood samples in the longitudinal, radial, and tangential directions. The macroscopic failure modes, energy dissipation results, and variations in the strain field were analyzed. The results showed that the load-displacement curve in each grain orientation included three stages: an elasticity stage, yield stage, and strengthening stage. Both the compressive strength and elastic modulus in the longitudinal direction were significantly higher than those in the radial and tangential directions, but there was no significant difference between the radial and tangential directions. Specimens in the longitudinal direction mainly presented fiber buckling, fiber shear slippage, and fiber fracture failure; in radial directions mainly presented compression compaction of the fiber cells; and in the tangential directions presented buckling and shear failure of the laminar layers. The energy absorption in the longitudinal direction was better than in the other directions. The strain changed significantly in the loading direction in the elastic stage while the shear strain changed remarkably in the yield stage in each grain orientation. In this paper, the compression mechanical properties of larch wood in different grain orientations were studied to provide a reference for its safe application in engineering.