文献类型：期刊文献

英文题名：Preparation and mechanical failure analysis of wood-epoxy polymer composites with excellent mechanical performances

作者：Guo, Dengkang[1] Guo, Nai[1] Fu, Feng[1] Yang, Sheng[1] Li, Gaiyun[1] Chu, Fuxiang[2]

第一作者：Guo, Dengkang

通信作者：Yang, S[1];Chu, FX[2]|[a0005bb8448ded70c319b]杨昇;[a0005728d87cb2daf502d]储富祥;

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210037, Peoples R China

年份：2022

卷号：235

外文期刊名：COMPOSITES PART B-ENGINEERING

收录：;EI(收录号：20220911739568);Scopus(收录号：2-s2.0-85125489527);WOS:【SCI-EXPANDED(收录号:WOS:000774922000004)】；

基金：Acknowledgement This work was financially supported by the National Natural Science Foundation of China (No. 31890772) .

语种：英文

外文关键词：Wood-epoxy polymer composites; Mechanical properties; Cell walls; Cell cavities; Failure mechanism

摘要：In this study, wood-epoxy polymer composites (WEPC) with excellent mechanical properties were prepared by adjusting the stress-strain system under mechanical load after introducing epoxy monomers into the cell cavities of plantation wood. The flexural strength, modulus, compression strength, and impact strength of the WEPCs were improved by up to 110.3%, 86.5%, 137.3%, and 110.6%, respectively. The flexure strength (140.5 Oa) was far beyond strength class TB20 (98 Oa), which was higher than that of rosewood. The improvement in mechanical strength was mainly attributed to the change of stress concentration properties by sharing the load with the epoxy polymer and the enhanced cell walls. The enhanced toughness was attributed to the increase in longitudinal cell splitting, as well as the "propagation of cracks" and "debonding" among multilevel structures of cell walls. The mechanical failure mechanism of WEPCs can be used as a reference for the design of wood-based composites.