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Shape Programming by Modulating Actuation over Hierarchical Length Scales
Advanced Materials ( IF 29.4 ) Pub Date : 2020-10-19 , DOI: 10.1002/adma.202004515
Tian Gao 1 , Emmanuel Siéfert 1 , Antonio DeSimone 2, 3 , Benoît Roman 1
Affiliation  

Many active materials used in shape‐morphing respond to an external stimulus by stretching or contracting along a director field. The programming of such actuators remains complex because of the single degree of freedom (the orientation) in local actuation. Here, texturing this field in zigzag patterns is shown to provide an extended family of biaxial active stretches out of an otherwise single uniaxial active deformation, opening a larger parameter space. By further modulating the zigzag patterns at the larger scale of the structure, its deployed shape can be controlled. This notion of texturing over hierarchical length scales follows geometrical principles, and is robust against changes in size and materials. The robustness of the approach is demonstrated by considering three different responsive materials: inextensible flat fabrics, channel‐bearing elastomer (respectively, contracting and expanding perpendicularly to the director field when actuated pneumatically), and 3D‐printed thermoplastic (composed of extruded filaments that contract when heated). It is shown that large‐scale shape‐morphing structures can be generated and that their geometry can be controlled with high accuracy.

中文翻译:

通过在分层长度尺度上调制驱动来进行形状编程

形状变形中使用的许多活性材料通过沿指向矢场拉伸或收缩来响应外部刺激。由于局部致动中的单个自由度(定向),因此这种致动器的编程仍然很复杂。在此,以锯齿形图案构造该场显示为提供了双轴活动拉伸的扩展族,而不是单轴活动变形,从而打开了更大的参数空间。通过在结构的更大比例上进一步调整锯齿形图案,可以控制其展开形状。这种在分层长度尺度上进行纹理化的概念遵循几何原理,并且可以抵抗尺寸和材料的变化。通过考虑三种不同的响应材料来证明该方法的鲁棒性:不可伸展的平面织物,带有通道的弹性体(气动驱动时分别垂直于指向矢场收缩和膨胀)和3D打印的热塑性塑料(由受热时收缩的挤出长丝组成)。结果表明,可以生成大规模的形状变形结构,并且可以高精度地控制其几何形状。
更新日期:2020-11-25
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