扭曲块状金属玻璃带的柔性变形结构
Compliant morphing structures from twisted bulk metallic glass ribbons
摘要：
在这项工作中，我们调查使用预扭曲的金属带作为积木形状变化的结构。我们制造这些元素扭转最初的平面带围绕其（纵向）质心轴成螺旋形的几何形状，然后热成型，使这种配置的无应力参考状态。螺旋形状允许带具有在其整个长度上变化的优选弯曲方向。这些弯曲方向用作柔性接头，并且实现了在没有预扭转的情况下无法实现的几种展开和收起配置，前提是压实不会引起材料失效。我们使用块体金属玻璃（BMG）制造这些带，因为它具有特殊的弹性和热成型属性。结合数值模拟，基于壳理论和扭转实验的分析模型，我们分析了各种带状几何形状的有限扭转力学。我们发现，在带状与起伏的边缘，扭曲变形可以更好地定位到所需的区域之前，热成型。最后，我们将多个功能区连接在一起，以创建可部署的系统。我们的工作提出了一个框架，用于创建全金属，但顺应性的结构，可能会发现应用程序作为空间结构和顺应性机器人的元素。
英文摘要：
In this work, we investigate the use of pre-twisted metallic ribbons as building blocks for shape-changing structures. We manufacture these elements by twisting initially flat ribbons about their (lengthwise) centroidal axis into a helicoidal geometry, then thermoforming them to make this configuration a stress-free reference state. The helicoidal shape allows the ribbon to have preferred bending directions that vary throughout its length. These bending directions serve as compliant joints and enable several deployed and stowed configurations that are unachievable without pre-twist, provided that compaction does not induce material failure. We fabricate these ribbons using a bulk metallic glass (BMG), for its exceptional elasticity and thermoforming attributes. Combining numerical simulations, an analytical model based on shell theory and torsional experiments, we analyze the finite-twisting mechanics of various ribbon geometries. We find that, in ribbons with undulated edges, the twisting deformations can be better localized onto desired regions prior to thermoforming. Finally, we join together multiple ribbons to create deployable systems. Our work proposes a framework for creating fully metallic, yet compliant structures that may find application as elements for space structures and compliant robots.
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