Smart Radially Folding Structures
Smart Radially Folding Structures
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DOI：
10.1109/tmech.2011.2153867
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发表时间：
2012-10
期刊：
影响因子：
--
通讯作者：
A. Conn;J. Rossiter
中科院分区：
文献类型：
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作者：
A. Conn;J. Rossiter
在本文中，我们提出了新的方法，利用被动和主动径向折叠机制的反应和动态结构。这些使得径向折叠结构能够应用于包括流体、医疗支架和拉胀材料的领域。利用梁的理论分析，提出了一种利用连杆应变能的弹性展开的紧凑形式。弹性应变能也显示出产生折叠行为，在完全收缩和完全膨胀时具有两个低能量状态，并且在一些中间位置处具有折叠切换点。聚合物智能材料的研究驱动主动折叠。这些材料可以通过折叠结构的特征容易地利用，包括其将1-D、2-D和3-D致动应变分解成更有效的单自由度线性、面积、体积或旋转输出的能力。许多聚合物智能材料的弹性和固态性质意味着它们可以实现弹性部署和双稳态。热激活的形状记忆聚合物被示出为将4段结构从膨胀状态折叠到收缩状态。8段介电弹性体致动器原型的实验测试表明，径向折叠结构可以将介电弹性体产生的大的双轴平面应变分解成单个线性或旋转输出冲程。
In this paper, we present novel methods for exploiting passive and active radially folding mechanisms for reactive and dynamic structures. These enable the application of radially folding structures in domains including fluidics, medical stents, and auxetic materials. A compact form of elastic deployment utilizing linkage strain energy is proposed using beam theory analysis. Elastic strain energy is also shown to produce bistable folding behavior, with two low energy states at full contraction and full expansion, and a bistable switching point at some intermediate position. Polymeric smart materials are investigated for driving active folding. These materials can be readily exploited through the features of the folding structure including its ability to resolve 1-D, 2-D, and 3-D actuation strains into a more effective single degree-of-freedom linear, areal, volumetric or rotational output. The elastic and solid-state nature of many polymeric smart materials means they can implement elastic deployment and bistability. A thermally-activated shape memory polymer is shown to fold a 4-segment structure from expanded to contracted states. Experimental testing of an 8-segment dielectric elastomer actuator prototype demonstrates that radially folding structures can resolve large biaxial planar strains generated by dielectric elastomers into a single linear or rotational output stroke.