Bamboo based composite materials are widely used for structural components in building and textile industries. The structural hierarchy across different scales could enhance the strength and toughness of bamboo for load-bearing applications. Firstly, chemical components of bamboo fibril are described, and bamboo fibril specimens are fabricated through chemical solution processing; Secondly, functionally graded mechanical properties of macroscopic bamboo fibers are studied with tensile experiments, and relations between graded mechanical properties and microstructures are explored; Afterwards, hierarchical microstructure characterization of bamboo across different scales are performed using scanning electron microscopy (SEM), and mechanical properties of bamboo fibrils are tested using homemade in-situ micro-tension setup. The results indicate that the elastic modulus, ultimate strain and strength of bamboo fibers are: 5.952 GPa, 0.0136 and 81.13 MPa respectively. The Young’s moduli, ultimate strains and fracture strengths of the five fibril samples located in (10.478, 12.285) GPa, (0.0172, 0.0217) and (181.87, 230.50) MPa, respectively. These experimental results suggest that the modulus and ultimate strength of bamboo fibril are higher than that of bamboo fibers which are attributed to several main factors including the ages of the bamboo, bamboo species, multi-lamella structures of the fibrils, geometry differences of fibrils, etc.

竹基复合材料被广泛用于建筑和纺织行业的结构部件。跨不同尺度的结构层次可以增强承重应用中竹子的强度和韧性。首先描述了竹纤维的化学成分，并通过化学溶液处理制备了竹纤维样品。其次，通过拉伸实验研究了宏观竹纤维的功能梯度力学性能，探讨了梯度力学性能与微观结构之间的关系。然后，使用扫描电子显微镜（SEM）对不同尺度的竹进行分层微观结构表征，并使用自制的原位微张力装置测试竹纤维的力学性能。结果表明，竹纤维的弹性模量，极限应变和强度分别为：5.952 GPa，0.0136 MPa和81.13 MPa。分别位于（10.478，12.285）GPa，（0.0172，0.0217）和（181.87，230.50）MPa的五个原纤维样品的杨氏模量，极限应变和断裂强度。这些实验结果表明，竹原纤维的模量和极限强度高于竹纤维，这归因于以下几个主要因素：竹的年龄，竹种，原纤维的多层结构，原纤维的几何形状差异，等等 285）GPa，（0.0172，0.0217）和（181.87，230.50）MPa。这些实验结果表明，竹原纤维的模量和极限强度高于竹纤维，这归因于以下几个主要因素：竹的年龄，竹种，原纤维的多层结构，原纤维的几何形状差异，等等 285）GPa，（0.0172，0.0217）和（181.87，230.50）MPa。这些实验结果表明，竹原纤维的模量和极限强度高于竹纤维，这归因于以下几个主要因素：竹的年龄，竹种，原纤维的多层结构，原纤维的几何形状差异，等等