Ji Hong-Mei, Liu Xiao-Na, Li Xiao-Wu
Department of Materials Physics and Chemistry, School of Material Science and Engineering and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2022 Jun 6;15(11):4039. doi: 10.3390/ma15114039.
The tensile strength and fracture toughness of softwood and hardwood are measured by the Boundary Effect Model (BEM). The experimental results of single-edge notched three-point bending tests indicate that the BEM is an appropriate method to estimate the fracture toughness of the present fibrous and porous woods. In softwood with alternating earlywood and latewood layers, the variation in the volume percentage of different layers in a small range has no obvious influence on the mechanical properties of the materials. In contrast, the hardwood presents much higher tensile strength and fracture toughness simultaneously due to its complicated structure with crossed arrangement of the fibers and rays and big vessels diffused in the fibers. The present research findings are expected to provide a fundamental insight into the design of high-performance bionic materials with a highly fibrous and porous structure.
软木和硬木的拉伸强度和断裂韧性通过边界效应模型（BEM）进行测量。单边切口三点弯曲试验的实验结果表明，BEM是估算当前纤维状和多孔木材断裂韧性的合适方法。在具有交替早材和晚材层的软木中，不同层的体积百分比在小范围内的变化对材料的力学性能没有明显影响。相比之下，硬木由于其复杂的结构，纤维和射线交叉排列，且大导管散布在纤维中，同时具有更高的拉伸强度和断裂韧性。本研究结果有望为设计具有高度纤维状和多孔结构的高性能仿生材料提供基本见解。
