文献类型：期刊文献

英文题名：The softwood fracture mechanisms at the scales of the growth ring and cell wall under bend loading

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];Lin, LY[2]

机构：[1]Nanjing Forestry Univ Mat & Sci & Engn, Nanjing 210037, Jiangsu, 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：53

期号：6

起止页码：1295-1310

外文期刊名：WOOD SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20194607676298);Scopus(收录号：2-s2.0-85074713810);WOS:【SCI-EXPANDED(收录号:WOS:000494230300001)】；

基金：The authors gratefully acknowledge the financial support of the Nature Science Foundation of China (No. 31770597) and the program from the China Scholarship Council (No. 201803270009).

语种：英文

外文关键词：Atomic force microscopy - Fracture - Softwoods - Structural members

摘要：The mechanism of wood fracture under bend loading is significant both for understanding wooden structural member failure and for predicting the strength of wooden structural members. This paper uses an in situ three-point bending test and atomic force microscopy to understand softwood bend fracture initiation and crack propagation at the scales of the growth ring and individual cells. The results revealed that the initial fracture crack occurred in the outermost layer of the tensile portion, which was related to the orientation of the wood rays, and then, the crack propagated in a zigzag manner. For the tangential loading fracture specimens, the latewood (LW) fracture types from the tensile part to the neutral layer were primarily intrawall in the S1/S2 interface, transverse transwall and longitudinal transwall, and the earlywood (EW) fracture type was longitudinal transwall. For the radially loaded specimens, the fracture types of LW tracheids of the tensile part were mainly transverse and longitudinal transwall. Additionally, the fracture type of the EW tracheids from the tensile part to the neutral layer was transverse transwall breakage.