Designing light responsive bistable arches for rapid, remotely triggered actuation
Designing light responsive bistable arches for rapid, remotely triggered actuation
复制标题
设计光响应双稳态拱门以实现快速远程触发驱动
DOI：
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发表时间：
2014
期刊：
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通讯作者：
T. White
中科院分区：
文献类型：
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作者：
Matthew L. Smith;M. Shankar;Ryan Backman;V. Tondiglia;K. Lee;M. McConney;David H. Wang;Loon;T. White
光响应偶氮苯官能化聚合物网络作为致动器候选者具有多种优势，包括远程触发的能力以及通过光强度、偏振、波长和材料排列进行高度可调控制的能力。阻碍这些材料在应用中使用的一个重大挑战是它们通常相对较慢的驱动速率和低功率密度，特别是在没有光热效应的情况下。自然界中用于提高驱动速率和功率输出的一种众所周知的策略是弹性能量的存储和快速释放（例如，Venus ytrap）。以大自然为灵感，我们进行了一系列实验，并开发了一个平衡力学模型，用于研究由玻璃状偶氮苯功能化聚合物制成的双稳态光响应拱的远程触发突跳。在简要讨论了实验观察之后，我们详细考虑了光学机械突跳的几何精确的平面杆模型。理论能量释放特性和独特的应变场曲线为提高执行器性能的设计策略提供了见解。这里介绍的双稳态光响应拱门可能是一个强大的选择，可用于从明显无源结构远程触发快速运动，例如二进制光学开关和定位器、具有变形拓扑的表面以及微米或毫米级机器人中的脉冲运动。
Light responsive azobenzene functionalized polymer networks enjoy several advantages as actuator candidates including the ability to be remotely triggered and the capacity for highly tunable control via light intensity, polarization, wavelength and material alignments. One signi cant challenge hindering these materials from being employed in applications is their often relatively slow actuation rates and low power densities, especially in the absence of photo-thermal e ects. One well known strategy employed in nature for increasing actuation rate and power output is the storage and quick release of elastic energy (e.g., the Venus ytrap). Using nature as inspiration we have conducted a series of experiments and developed an equilibrium mechanics model for investigating remotely triggered snap-through of bistable light responsive arches made from glassy azobenzene functionalized polymers. After brie y discussing experimental observations we consider in detail a geometrically exact, planar rod model of photomechanical snap-through. Theoretical energy release characteristics and unique strain eld pro les provide insight toward design strategies for improved actuator performance. The bistable light responsive arches presented here are potentially a powerful option for remotely triggered, rapid motion from apparently passive structures in applications such as binary optical switches and positioners, surfaces with morphing topologies, and impulse locomotion in micro or millimeter scale robotics.