Macroscopic and microscopic mechanical behaviors of climbing tendrils  

作　　者：Q.Guo J.J.Dong Y.Liu X.H.Xu Q.H.Qin J.S.Wang 

机构地区：[1]Tianjin Key Laboratory of Modern Engineering Mechanics,Department of Mechanics,Tianjin University,Tianjin 300054,China [2]State Key Laboratory of Nonlinear Mechanics (LNM),Institute of Mechanics,Chinese Academy of Science,Beijing 100080,China [3]Research School of Engineering,Australian National University,Canberra,ACT 2601,Australia

出　　处：《Acta Mechanica Sinica》2019年第3期702-710,共9页力学学报（英文版）

基　　金：the National Natural Science Foundation of China (Grants 11872273, 11472191, 11602163, and 11672297);the Major Program of the National Science Foundation of China (Grant 11890683);the Opening Fund of State Key Laboratory of Nonlinear Mechanics;the Australian Endeavour Research Fellowship.

摘　　要：Tendril-bearing climbing plants must recur to the tendril helices with chiral perversion or dual chirality for climbing and to obtain sun exposure. Despite researchers' prolonged fascination with climbing tendrils since Darwin's time and even earlier, why the soft and slender tendrils can bear heavy loads such as the self-weight of a plant or additional load caused by rain remains elusive. In this paper, we take towel gourd tendrils as an example and investigate the macroscopic and microscopic mechanical behaviors of tendrils through experiments and simulations. Our study indicates that the tendril filament exhibits rubber-like hyperelastic behaviors and can particularly endure large elongation, which is mainly attributed to the superelasticity of the cellulose fibril helix contained in the cell wall. Combination of the tendril helical structure with dual chirality or chiral perversion at a macroscale and a cellulose filament helix at a subcellular level creates superior elasticity for biological species relying on support and climbing. This study provides deep insight into the structure-property relationship of climbing tendrils, and the relationship is useful for the bioinspired design of composite systems with superior elasticity.

关 键 词：CLIMBING TENDRIL Mechanical behaviors STRUCTURE-PROPERTY relationship Large ELONGATION 

分 类 号：O3[理学—力学]