| 摘要: |
| 基于植物叶脉自然选择的结构优越性,构建叶脉的数字化模型,研究其组织结构的力学性能。选取具有典型耐候性和清晰叶脉结构的荷花玉兰叶脉进行叶脉组织结构三维多孔模型的构建,通过图像阈值分割方法对组织结构扫描电镜图进行处理,采用基于狄洛尼三角剖分的面积权重方法对阈值分割后的二值图片进行网格化,形成组织结构的数字化模型;采用有限元法对叶脉横截面多孔组织进行拉伸模拟和冲击仿真。结果表明,叶脉最外缘的区域对叶脉组织力学性能的贡献最大,而具有细胞壁厚度呈梯度变化的叶脉模型在小位移情况下对能量吸收表现出良好的优越性,其冲击破坏过程是依层进行的。 |
| 关键词: 叶脉组织 纤维素 数字化建模 模拟仿真 |
| DOI：10.11841/j.issn.1007-4333.2016.03.16 |
| 投稿时间：2015-04-12 |
| 基金项目:国家自然科学基金项目(50975090) |
|
| Digital reconstruction and static and dynamic performance analysis of leaf vein |
|
LIU Wang-yu1, JIANG Xiao-yong1, WU Lei2
|
| (1.School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China;2.Zhongshan Torch Polytechnic, Zhongshan 528436, China) |
| Abstract: |
| Based on the superiority of natural selection of leaf veins, an accurate digital model to characterize the relationship between mechanical properties and the structure is built.The three-dimensional digital model is a reconstruction of the cross-section of Magnolia grandiflora leaf, which has typical weatherability and clear veins.Its SEM image was firstly divided into several regions and processed by using threshold separation method.Then, a binary image, or the numerical model of the leaf vein, is obtained based on the algorithm of Area-weighted Delaunay triangle mesh method.Tensile and impact strengths of the cross section of vein tissue are simulated with finite element method.The result shows that the outer edge of the vein tissue plays a significant role in its tensile strength.And the vein tissue with gradient cell wall thickness performs better than uniform cell wall thickness in energy absorption under small displacement.The impact damage happens layer by layer. |
| Key words: vein tissue digital modeling simulation cellulose |
