Elastic BucMing of Bionic Cylindrical Shells Based on Bamboo

• Published in: Journal of bionics engineering Vol. 5; no. 3; pp. 231 - 238
• Main Author: Jian-feng Ma Wu-yi Chen Ling Zhao Da-hai Zhao
• Format: Journal Article
• Language: English
• Published: 2008
• Subjects: 仿生学; 仿生设计; 圆柱结构; 竹子空心
• ISSN: 1672-6529; 2543-2141

High load-bearing efficiency is one of the advantages of biological structures after the evolution of billions of years. Biomimicking from nature may offer the potential for lightweight design. In the viewpoint ofrnechanics properties, the culm of bamboo comprises of two types of cells and the number of the vascular bundles takes a gradient of distribution. A three-point bending test was carried out to measure the elastic modulus. Results show that the elastic modulus of bamboo decreases gradually from the periphery towards the centre. Based on the structural characteristics of bamboo, a bionic cylindrical structure was designed to mimic the gradient distribution of vascular bundles and parenchyma cells. The buckling resistance of the bionic structure was compared with that of a traditional shell of equal mass under axial pressure by finite element simulations. Results show that the load-bearing capacity of bionic shell is increased by 124.8%. The buckling mode of bionic structure is global buckling while that of the conventional shell is local buckling.