文献类型：期刊文献

英文题名：In situ detection of the fracture behaviour of moso bamboo (Phyllostachys pubescens) by scanning electron microscopy

作者：Liu, Huanrong[2] Wang, Xiaoqing[1] Zhang, Xiubiao[2] Sun, Zhengjun[2] Jiang, Zehui[2]

第一作者：Liu, Huanrong

通信作者：Wang, Xiaoqing

机构：[1] Research Institute of Wood Industry, Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing, 100091, China; [2] Department of Biomaterials, International Center for Bamboo and Rattan, No. 8, Futong Eastern Street, Wangjing Area, Chaoyang District, Beijing, 100102, China

年份：2016

卷号：70

期号：12

起止页码：1183-1190

外文期刊名：Holzforschung

收录：EI(收录号：20164903087737);Scopus(收录号：2-s2.0-84998631582)

语种：英文

外文关键词：Bamboo - Enamels - Fibers - Field emission microscopes - Fracture - Debonding - Crack propagation - Fracture toughness - Tissue - Field emission - Tensile testing - Scanning electron microscopy

摘要：The remarkable fracture toughness of bamboo culms is highly attributed to the proper embedding of the stiff fibre caps of the vascular bundles into the soft parenchyma matrix. In this study, the fracture behaviour of small specimens of moso bamboo (Phyllostachys pubescens) in tension and bending were investigated in situ with a scanning electron microscope (SEM) to visualise crack initiation and propagation within bamboo tissues and its interactions with the structural components (fibres and parenchyma tissues). Fracture surfaces were studied by field-emission SEM. The fracture of bamboo in either tension or bending was non-catastrophic, and cracks propagated in a tortuous manner with massive interfacial delamination. The stiff fibre bundles played an important role in restraining crack propagation, acting as bridges to inhibit cracks opening and also as "crack stoppers" inducing extensive crack-deflections. Microstructural analysis of the fractured surfaces revealed that substantial interfacial debonding, sliding and fibre pull-outs occurred at various length scales, which are believed to be effective in dissipating the crack energy. The synergistic effects of crack-deflection, crack-bridging and interfacial debonding are regarded to be mainly responsible for the remarkable fracture toughness of bamboo. ? 2016 Walter de Gruyter GmbH, Berlin/Boston.