Mannan Sayyad, Paul Knox J, Basu Sumit
Department of Mechanical Engineering , Indian Institute of Technology Kanpur , Kanpur , Uttar Pradesh 208016 , India.
Centre for Plant Sciences , Faculty of Biological Sciences , University of Leeds , Leeds LS2 9JT , UK.
R Soc Open Sci. 2017 Jan 18;4(1):160412. doi: 10.1098/rsos.160412. eCollection 2017 Jan.
Bamboo is a ubiquitous monocotyledonous flowering plant and is a member of the true grass family . In many parts of the world, it is widely used as a structural material especially in scaffolding and buildings. In spite of its wide use, there is no accepted methodology for standardizing a species of bamboo for a particular structural purpose. The task of developing structure-property correlations is complicated by the fact that bamboo is a hierarchical material whose structure at the nanoscopic level is not very well explored. However, we show that as far as stiffness is concerned, it is possible to obtain reliable estimates of important structural properties like the axial modulus from the knowledge of certain key elements of the microstructure. Stiffness of bamboo depends most sensitively on the size and arrangement of the fibre sheaths surrounding the vascular bundles and the arrangement of crystalline cellulose microfibrils in their secondary cell walls. For the species of bamboo studied in this work, we have quantitatively determined the radial gradation that the arrangement of fibres renders to the structure. The arrangement of the fibres gives bamboo a radially graded property variation across its cross section.
竹子是一种随处可见的单子叶开花植物，属于禾本科。在世界许多地方，它被广泛用作建筑材料，尤其是在脚手架和建筑中。尽管其用途广泛，但对于将特定种类的竹子用于特定结构目的，尚无公认的标准化方法。由于竹子是一种分级材料，其纳米级结构尚未得到很好的研究，因此建立结构-性能关系的任务变得复杂。然而，我们表明，就刚度而言，从微观结构的某些关键要素的知识中，可以获得重要结构性能（如轴向模量）的可靠估计。竹子的刚度最敏感地取决于围绕维管束的纤维鞘的尺寸和排列以及它们次生细胞壁中结晶纤维素微纤丝的排列。对于本研究中所研究的竹子种类，我们已经定量地确定了纤维排列赋予结构的径向梯度。纤维的排列使竹子在其横截面上具有径向梯度的性能变化。
