材料科学
环氧树脂
复合材料
韧性
机械负荷
艾氏冲击强度试验
弯曲模量
极限抗拉强度
模数
聚合物
压力(语言学)
抗弯强度
语言学
哲学
作者
Dengkang Guo,Nai Guo,Feng Fu,Sheng Yang,Gaiyun Li,Fuxiang Chu
标识
DOI:10.1016/j.compositesb.2022.109748
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 MPa) was far beyond strength class TB20 (98 MPa), 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.
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