智能螺旋结构的灵感来自眼虫的表膜
Smart helical structures inspired by the pellicle of euglenids
摘要：
本文讨论了一个可重构结构的概念，生物的灵感来自于裸藻，一个家庭的单细胞原生生物的细胞壁结构，并基于相邻条的相对滑动。均匀滑动将由直的和平行的条带组装而成的圆柱体变成具有较小高度和较大半径的圆柱体，其中条带变形成平行螺旋族。我们研究了这种圆柱形组件的力学，其中互锁条被允许在其交界处自由滑动，并计算驱动和控制复合结构形状变化所需的外力（两端的轴向力和轴向扭矩，或侧表面上的压力）。尽管结构简单，我们发现一个非常复杂的机械行为，可以通过自发弯曲或扭曲的条调谐。
英文摘要：
This paper deals with a concept for a reconfigurable structure bio-inspired by the cell wall architecture of euglenids, a family of unicellular protists, and based on the relative sliding of adjacent strips. Uniform sliding turns a cylinder resulting from the assembly of straight and parallel strips into a cylinder of smaller height and larger radius, in which the strips are deformed into a family of parallel helices. We examine the mechanics of this cylindrical assembly, in which the interlocking strips are allowed to slide freely at their junctions, and compute the external forces (axial force and axial torque at the two ends, or pressure on the lateral surface) necessary to drive and control the shape changes of the composite structure. Despite the simplicity of the structure, we find a remarkably complex mechanical behaviour that can be tuned by the spontaneous curvature or twist of the strips.
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