文献类型：期刊文献

英文题名：The fracture mechanism of softwood via hierarchical modelling analysis

作者：Wang, Dong[1,2] Lin, Lanying[2,3] Fu, Feng[2] Fan, Mizi[3]

第一作者：Wang, Dong

通信作者：Lin, LY[1]

机构：[1]Nanjing Forestry Univ Mat & Sci & Engn, Nanjing 210037, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[3]Brunel Univ, Coll Engn Design & Phys Sci, Uxbridge UB8 3PH, Middx, England

年份：2019

卷号：65

期号：1

外文期刊名：JOURNAL OF WOOD SCIENCE

收录：;EI(收录号：20194407612877);Scopus(收录号：2-s2.0-85074206843);WOS:【SCI-EXPANDED(收录号:WOS:000508589200001)】；

基金：This work was supported by the National Natural Science Foundation of China [Grant Number 31770597, 2017] and the program from the China Scholarship Council [201803270009, 2018].

语种：英文

外文关键词：Softwood; Hierarchical model; Stress concentration; Initial fracture

摘要：A hierarchical model of softwood was developed to effectively analyze stress concentration and predict initial fracture of the wood cell wall under different loading scenarios. The results indicated that the simulated stress concentration regions of the tracheid wall approximately matched the experimental initial fracture locations. The stress concentration and initial fracture of the tracheid wall under longitudinal tensile stress occurred in the S-2 layer. In the cases of pure longitudinal-radial (LR) or longitudinal-tangential (LT) in-plane shear loading, the highest stresses are observed in the S-1/S-2 interface and the S-3 layer, but the initial fractures of the tracheids of the neutral layer under the LR or LT shear stress only occurred in the S1/S2 interface. Furthermore, the tracheids of the tensile parts outermost of bending specimen were subjected to the longitudinal tension and shear coupling stresses that led to the two kinds of cracks occurring, including trumpet-shaped cracks in the S-2 layer, and S-1/S-2 interface debonding.