文献类型：期刊文献

英文题名：Effects of high-intensity microwave (HIMW) treatment on mechanical properties and bending failure mechanisms of radiata pine (Pinus radiata D. Don)

作者：Xing, Xuefeng[1,2] Li, Shanming[1] Jin, Juwan[2] Wang, Zhenyu[3] Fu, Feng[1]

第一作者：Xing, Xuefeng

通信作者：Li, SM[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing, Peoples R China;[2]Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing, Peoples R China;[3]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing Key Lab Wood Sci & Engn, MOE Key Lab Wooden Mat Sci & Applicat, Beijing, Peoples R China

年份：2024

卷号：58

期号：5-6

起止页码：2073-2096

外文期刊名：WOOD SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20244017140991);Scopus(收录号：2-s2.0-85205323836);WOS:【SCI-EXPANDED(收录号:WOS:001324501800001)】；

基金：The authors would also like to thank Fangyu Yin from the Research Institute of Wood Industry, Chinese Academy of Forestry (CRIWI) for assistance with the preparation of the DIC specimens, and Dr. Yanshuang Guo from the State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration for his technical assistance on AE and DIC tests.

语种：英文

摘要：This study investigated the effects of high-intensity microwave (HIMW) treatment on the mechanical properties of radiata pine wood. The treatment, conducted on sapwood and heartwood with 60% initial moisture content, involved varied microwave energy densities: 60, 80, and 100 kWh/m(3). Tests evaluated tensile and compressive properties in three directions, alongside shear strength and bending properties. Acoustic emission (AE) and digital image correlation (DIC) techniques probed damage evolution under bending loads before and after HIMW treatment. As microwave energy density increased, compressive, tensile, and shear strength decreased, with heartwood being the most susceptible. Substantial reductions occurred in longitudinal compressive properties and tensile properties perpendicular to the grain. After HIMW treatment (80 kWh/m(3) and 100 kWh/m(3) for sapwood and heartwood, respectively), although there was a slight decrease in the modulus of elasticity and bending strength, there was a significant increase in bending plasticity. HIMW-treated specimens exhibited more high-frequency AE signals during elastic-plastic deformation, indicating more frequent fractures in the treated wood during three-point bending. Changes in the microscopic structure of the wood specimens caused by HIMW treatment increased the damage growth rate and stress redistribution efficiency during loading, augmenting the bending plasticity of wood.