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In-situ investigation of deformation behaviors of moso bamboo cells pertaining to flexural ductility
Cellulose ( IF 5.7 ) Pub Date : 2020-09-10 , DOI: 10.1007/s10570-020-03414-0
Meiling Chen , Ling Ye , Ge Wang , Xinxin Ma , Qi Chen , Changhua Fang , Benhua Fei , Chunping Dai

Excellent flexural strength and ductility characteristics make bamboo an ideal natural material for many structural applications. This paper focuses on revealing the flexural ductility of moso bamboo (Phyllostachys edulis (Carr.) J. Houz.) at the cellular level. Scanning electron and three-dimensional X-ray microscopes were applied to examine the morphological changes and interaction of bamboo cells during the bending experiment. The flexural ductility of bamboo was investigated based on spatial arrangement and morphological structure of cells. During bending, bamboo cells were compressed in the longitudinal direction and elongated in the radial direction in the compressive layer. However, bamboo cells in the tensile layer were elongated in the longitudinal direction and shortened in the radial direction. Parenchyma cells had relatively larger deformation than other cells. The largest relative deformations of parenchyma cells reached − 4.49% (longitudinal direction) and 3.08% (radial direction) in the compressive layer and 2.33% (longitudinal direction) and − 0.47% (radial direction) in the tensile layer. Both parenchyma cells and vessels can function as a buffer against applied load and enhance the flexural ductility of bamboo. Fiber could restrict the deformation of its adjacent cells and provide strength for bamboo. Results revealed the mechanism of deforming of natural bamboo from the micro perspective and provided knowledge for bionic design on the basis of the morphological structure of bamboo.



中文翻译:

毛竹细胞与弯曲延展性有关的变形行为的原位研究

优异的抗弯强度和延展性使竹子成为许多结构应用的理想天然材料。本文着重于揭示毛竹的弯曲延展性(Phyllostachys edulis(Carr。J. Houz。)在细胞水平上。用扫描电子显微镜和三维X射线显微镜观察弯曲实验中竹细胞的形态变化和相互作用。基于细胞的空间排列和形态结构,研究了竹子的弯曲延展性。在弯曲期间,竹细胞在纵向上被压缩并且在压缩层上在径向上伸长。但是,拉伸层中的竹格在纵向上伸长而在径向上缩短。实质细胞比其他细胞具有相对更大的变形。薄壁组织的最大相对变形在压缩层达到-4.49%(纵向)和3.08%(径向),以及2.33%(纵向)和-0。拉伸层的47%(径向)。薄壁组织细胞和血管都可以充当缓冲作用,抵抗施加的负荷并增强竹子的挠曲延展性。纤维可以限制其相邻细胞的变形,并为竹子提供强度。结果从微观角度揭示了天然竹材变形的机理,并根据竹材的形态结构为仿生设计提供了知识。

更新日期:2020-09-11
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